{"Bibliographic":{
"Title":"The cycling of toxic organic substances in the Great Lakes ecosystem : ... annual progress report to the Office of Marine Pollution Assessment, National Oceanic and Atmospheric Administration.",
"Authors":"Great Lakes Environmental Research Laboratory, NOAA",
"Publication date":"1983",
"Publisher":"Great Lakes Environmental Research Laboratory, NOAA"
},
"Administrative":{
"Date created":"02-21-2025",
"Language":"English",
"Rights":"CC 0",
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    "content": "TD 427 .07 G7 Apr 83\nGLERL LIBRARY\nSemiannual Report to The Office of Marine Pollution Assessment National Oceanic and Atmospheric Administration\nTHE CYCLING OF TOXIC ORGANIC SUBSTANCES IN THE GREAT LAKES ECOSYSTEM\nLake Superior-\nLake\nLake Michigan\nHuron\nLake Ontario\nLake Erie\nApril 1983 Cooperative Program Between\nGreat Lakes Environmental Research Laboratory ERL / NOAA Ann Arbor, Michigan 48104 and University of Michigan University of Minnesota Michigan State University Argonne National Laboratory Oak Ridge National Laboratory\nADM\nNOAA\nION\nMEN\nOF COMM\nDEPART\nMERCE\n*\nUNITED\nMERICA +\nED STATES OF AME\n5\nGLERL LIBRARY\nSemiannual Report to The Office of Marine Pollution Assessment National Oceanic and Atmospheric Administration\nTHE CYCLING OF TOXIC ORGANIC SUBSTANCES IN THE GREAT LAKES ECOSYSTEM\nApril 1983 Cooperative Program Between Great Lakes Environmental Research Laboratory ERL/NOAA Ann Arbor, Michigan 48104 and\nUniversity of Michigan University of Minnesota Michigan State University Argonne National Laboratory Oak Ridge National Laboratory\nTD 427 . 07 G7\nTABLE OF CONTENTS\nPage\nBackground\n1\nIntroduction\n2\nGoals and Objectives\n4\nApproach . 5\nConceptualized Toxic System Model\n7\nProject/Process Matrix\n8\nIndividual Reports\nLong-term behavior of PAH\n9\nRole of benthic invertebrates . 12\nRadiotracer studies 23\nVertical dynamics\n37\nTransport modeling\n39\nPartitioning of toxic organics\n41\nHi sed fluxes\n44\nPhotodegradation\n47\nBioturbation\n49\nInvertebrate stress 50\nSediment-organic dynamcis 53\nWatershed inputs\n56\nUpper trophic level model\n58\n4\nBackground\nIn 1978, the U. S. and Canada signed a Great Lakes Water Quality Agreement that required \"research programs in support of the Great Lakes International Surveillance Plan be established at a level sufficient to identify temporal and spacial trends in the concentration of persistent toxic substances such as PCB, mirex, DDT, mercury, and dieldrin, and of other substances known to be present in biota and sediment of the Great Lakes System\".\nIn August, 1979, the Great Lakes Environmental Research Laboratory (GLERL) began a research program in cooperation with the Office of Marine Pollution Assessment (OMPA), whose goal is the development of a capability to predict the environmental consequence of persistent synthetic organic contaminants in the Great Lakes ecosystem. The understanding of long term OMPA funding has allowed GLERL to develop cooperative agreements with several research institutions and to pursue a comprehensive research program focused on a few questions regarding the flow of selected organics within the Great Lakes. The results generated in this program will be transferrable to coastal marine systems.\nA predictive capability is synonymous with modeling, and to accomplish this a modeling team has been set up in-house consisting of chemical, toxi- cological, ecological, and physical scientists. The modeling group is sup- ported by researchers working on primary ecosystem processes. Most of the process research has been conducted at the University of Michigan, however, our program now has expanded to include several research groups, an arrange- ment which allows for a maximum of flexibility. In the four fiscal years\n1\n(FY 79-82) of this program, over 2/3 of OMPA funding has been spent on university research projects, primarily at Michigan. Because the program fits so well within its mission, GLERL has more than matched the in-house OMPA funds.\nIntroduction\n-\nThe leakage of toxic synthetic organic contaminants into aquatic eco- systems is a well recognized global problem. The conclusion of a recent workshop on the \"Scientific Basis for Dealing with Chemical Toxic Substances in the Great Lakes\", co-sponsored by the GLERL (Sonzogni and Swain, 1980), was that the Great Lakes are particularly susceptible because of high population density, concentration of heavy industry and slow (decade-century) flushing rates. Similar evaluations have been expressed by the Great Lakes Science Advisory Board (IJC, 1980a), Water Quality Board (IJC, 1980b) and Toxic Substances Committee (IJC, 1980c) of the International Joint Commission. Over 400 toxic contaminants have been identified to date within the Great Lakes ecosystem (IJC, 1980c) and the extent of the hazards for most of these are poorly understood.\nWhile most of these contaminants are \"perceived\" to be detrimental to environmental quality, several toxic organics have been identified as the source of \"real\" problems. High concentrations of DDT in Great Lakes fish severely impacted the herring gull population of the basin in the late 60s and early 70s. This once common predator is now beginning to reestablish itself, although high levels of PCB and TCDD may slow their recovery. PCB level in Lake Michigan sportfish are significantly above the FDA recommended\n2\nlevel of two parts per million. It has been estimated that this contami- nation is costing the state of Wisconsin over one million dollars per year (U. Wisc., 1980) with costs for the entire basin many times this amount. A report by the National Research Council (NRC, 1979) states that the Great Lakes are the largest reservoir of PCBs in the United States. Another identified problem is Mirex\u00ae in Lake Ontario (Kaiser, 1978; Pickett and Dossett, 1979). This compound, a fire ant pesticide manufactured in the basin, leaked into the lake and contaminated the fish to a level which resulted in a New York State ban on their commercial sale. Increased incidences of neoplasia (tumerous lesions) have been found in the fishes of the Great Lakes and tentatively atttributed to relatively high concentrations of polynuclear aromatic hydrocarbons (Sonstegard, 1977; Black et al, 1980; Eadie et al., 1982 a,b). High levels of dieldrin, toxaphenes, and dioxin have been measured indicating that other real problems are out there waiting to be found.\nAttempts to model the fate of toxic organic compounds in aquatic eco- systems appear to provide a good first order estimate of their long term behavior (Baughman and Lassiter, 1978; Mackay, 1979; Eadie et al., 1981). These models are excellent tools for assembling existing information, testing system sensitivity and designing a coherent research program. In time, they will be useful tools in the decision-making process as well.\nSince its creation in 1974, GLERL has specialized in the design and development of ecosystem models which simulate or predict the physical, chemical and biological responses of the Great Lakes to imposed stresses.\n3\nIn this program, our efforts to date have focused on the development of system models, supported by the specific process research required to improve, calibrate and/or validate our mathematical abstractions. Modeling-experi- mental interactions enable us to make stepwise improvements in our under- standing of the cycling, behavior and fate of synthetic contaminants. Such information is necessary to identify the contaminants which pose the greatest threat to the environment, which organisms or regions within the lakes are most affected, what can be expected in the years ahead and what can be done to reduce the level of ecosystem stress. Goals and Objectives\nThe goal of this program is to produce a clearer understanding of the cycling of hydrophobic toxic organic compounds in the Great Lakes environ- ment. Our ultimate objective is to be able to predict locations, concen- trations, decay rates, residence times and eventual sinks of these materials under conditions of long term, low level leakage into the environment or a major loading from some point source. This information is critical for toxicologists, ecologists and resource managers to evalue the potential impacts of particular materials introduced into the Great Lakes region and to provide cost beneficial solutions to the problems in balancing the continued production and use of these compounds with the responsibility of protecting the Great Lakes as a resource. In the final analysis, environ- mental resource management comes down to a trade-off between \"acceptable risks\" and \"unacceptable costs\", and best judgments leading to a suitable balance can only be achieved if the information base is sound.\n4\n-\nApproach\nMost persistent toxic organics behave similarly in the aquatic environment; they are only slightly soluble and partition onto particulate material, they tend to photodecompose and evaporate as major removal path- ways, they are generally resistant to microbial attack and they concentrate in the sediments. This similarity of behavior makes a modeling approach attractive and recently toxic cycling models have begun to appear in the literature. These models require compound-specific experimental rate process information tailored for the ecosystem to which it is applied.\nWe are employing a systems approach, in which a series of models will be developed. These include the calibration of available equilibrium (Fugacity) and steady state thermodynamic model (EXAMS; EPA) for the\nGreat Lakes: the development of a one-dimensional, time-dependent, process model and the calibration of a two-dimensional time-dependent transport (modified oil spill) model containing first order decomposition, resuspension and sedimentation terms. Our models will be continuously upgraded through the results of our process research experiments, both in-house and under contract, along with other information entering the literature. Carrying our process research and modeling simultaneously will allow us to continually determine the weakest or most senstive areas in our systems approach and define research necessary to address these specific problems. Ultimately our goal is to combine calibrated ecosystem cycling models with system transport models.\nWe have concentrated on two classes of toxic organic substances, poly- nuclear aromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB).\n5\nField and laboratory studies on the rates of volatilization, photode- composition, sorption onto particulates indigenous to the Great Lakes, biological decomposition, aggregation and settling were designed and implemented to support our toxic organic cycling model. During the past year we have expanded our program to include DDT and its decomposition products and several radionuclides including Cesium 137, Beryllium 7, and Cerium 144. There is a large data base on the distribution of these com- pounds as well as information on their loads to the lakes and decomposition pathways and rates. This wealth of information can be used in the cali- bration phase of our modeling program.\nA conceptualization of our toxic organic system is shown in Figure 1. The 15 process arrows are being studied in our program as shown in the Project/Process Matrix (Table 1). The column marked M is to represent those directly involved in modeling.\nProgress reports on these individual projects follow:\n6\nConceptualized Toxic System Model\nAtmosphere\n3\n1\nP\n2\nD\n-6\nWater Column\n4\n-5\nB\n+7\n8\n9\n10\nActive Sediments\nB\n12\n13\nD\n14\nDeep Sediments\n15\nP\nConceptualized toxic system model. P represents particle phase, D represents dissolved phase, and B is an abbrevi-\nated food web. The 15 process arrows are:\n1. Photolysis\n2. Sorption\n3. Air-water exchange\n4. Grazing and fecal pellet generation\n5. Filtering\n6. Photolysis\n7. Biological decomposition\nSettling and resuspension\n8. 9. Food web dynamics\n10. Transport and dispersion\n11. Biological decomposition\n12. Benthos-sediment interactions\n13. Benthos-pore water interactions\n14. Sorption\n15. Bioturbation and burial\n7\nWI\n. .\n711\nP\nTable 1\nPROJECT/PROCESS MATRIX\nP.I.\nDescription\n1\n2\n3\n4\n5 6 7\n8\n9\n10\n11\n12\n13\n14\n15\nM\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nU.MI\nRice & Meyers Simmons\nWhite\nRossmann\nParticle Associated Contaminants Photolysis Bioturbation Sediment Fluxes\n8\nU.MN\n. Eisenreich\nSed. Accumul. & Diagenesis\nX\nX\nX\nMI. ST.\n\u00b7 Giesy\nToxic Stress Test\nX\nX\nANL\n. Nelson\nRadionuclide Loads\nX\nX\nX\nX\nX\nBreck\nFish Modeling\nProcess\nGLERL\nEadie\nPAH Cycling\n\u00b7 Robbins\nRadiotracer Applications\n\u00b7 Landrum\nContaminant & Benthic Interactions\nBennett & Clines\n2D & 3D Transport Models\nVertical Dynamics Modeling\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nX\nMc Cormick\nORNL\n-\n-\nPROGRESS REPORT\nApril, 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104\n2. Principal Investigator: Dr. Brian J. Eadie\n3. Title: Long-term Behavior and Fate of Polycyclic Aromatic Hydrocarbons and Other Toxic Organic Contaminants in the Great Lakes\n4. Project Summary: The objectives of this project are 1) to develop and calibrate long-term toxic cycling models for the Great Lakes and 2) to conduct experiments on processes which affect the transport of synthetic organic compounds across the sediment-water interface.\n5. Status: Part I. During the past few months, efforts have been made to design a toxic cycling model which includes the effect of sediment resuspension and re- equilibriation of sediments with the water column. Programming and testing are currently underway. This model will be calibrated with radionuclide data (Pb-210, Cs-137, Be-7) from our sediment trap program. This model is designed as a coupled Great Lakes model. It will take monthly time steps and non-steady state input. Once calibrated satisfactorily with radionuclide data, case studies of toxic organics will be run. One final product will be analysis of the Great Lakes' response to loads of compounds with solubility/decomposition values ranging over several orders of magnitude.\nPart II. During the last winter, our sediment trap program continued with the deployment of 26 traps at five locations throughout Lake Michigan. These data will more than double our information base on the magnitude of re- suspension during the unstratified period. Analyses are scheduled for r adio- nuclides, nutrients, PAH, and chlorinated hydrocarbons.\nA supplementary trap program has been conducted on a monthly basis throughout the past year. Cumulative mass flux and Be-7 data for this project are shown in Robbins' report in this issue. This project will be modified to collect samples further offshore (mid-lake) on a biweekly basis during the coming year.\nOur analyses of PAH in the high sed cores from Lakes Ontario and Michigan are almost complete. The Lake Michigan core was complicated by several apparent slumping events, making conclusions difficult. PAH in the Ontario cores show several spikes in concentration and a buildup and eventual decay of perylene from diagenetic causes. These data will be analyzed in more detail.\n9\nSeveral reports on PAH in the Great Lakes have been published by our group. One major result has been the finding that major Great Lakes benthic organisms have the ability to mobilize sedimentary PAH and that they do serve as a major food source for fish.\nOne other major project is underway. This one is to measure the formation and decomposition rates of complexes of natural organics and synthetic organics. Such complexes appear to be common in pore waters of the lakes and appear to modify the bioavailability of the synthetic compounds to benthic organisms. This project will be expanded to study partitioning of synthetic organics to particulate matter indigenous to the Great Lakes.\n-\n-\n6. Presentations:\nEadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner, and T. Nalepa. 1982. Bioconcentrations of PAH by some benthic organisms of the Great Lakes. 7th International Symposium on Polynuclear Aromatic Hydrocarbons. October 26-28, Columbus, Ohio.\nEadie, B. J., J. A. Robbins, R. L. Chambers, C. P. Rice, C. Schelski, and W. Frez. 1982. Sediment Trap Measurements of Resuspension and Settling Fluxes in Lake Michigan. Am. Soc. of Limn. and Ocn. Fall Mtg, San Francisco Dec. 7-15.\nRobbins, J. A. and B. J. Eadie. Beryllium-7: A tracer of seasonal particle transport processes in Lake Michigan. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982.\nLandrum, P. F., S. R. Nihart, B. J. Eadie, and W. S. Gardner. 1982. Reverse Phase Separation Method for Determining Pollutant Binding in Aldrich\u00ae Humic Acid and Dissolved Organic Carbon of Natural Waters. 3rd Annual Meeting of Society of Environmental Toxicology and Chemistry. November 14-17, Washington, D. C.\n7. Publications:\nEadie, B. J., Faust, W., Gardner, W. S., and Nalepa, T. (1982a) : Polycyclic Aromatic Hydrocarbons in Sediments and Associated Benthos in Lake Erie. Chemosphere 11(2) : 185-191.\nEadie, B. J., Landrum, P. F., and Faust, W. (1982b) : Polycyclic Aromatic Hydrocarbons in Sediments, Pore Water and the Amphipod Pontoporeia hoyi from Lake Michigan. Chemosphere 11:857-858.\nEadie, B. J., Rice, C. P., and Frez, W. A. (1982) : The role of the benthic boundary in the cycling of PCBs in the Great Lakes. pp 213-228 in: Physical behavior of PCBs in the Great Lakes. D. Mackay et al. eds., Ann Arbor: Ann Arbor Science.\n10\nEadie, B. J., P. F. Landrum, W. R. Faust, N. R. Morehead, W. S. Gardner, and T. Nalepa (1983). Bioconcentrations of PAH by some benthic organisms of the Great Lakes. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium, Battelle Press. (In Press)\nEadie, B. J. (1983). Polycyclic Aromatic Hydrocarbons in the Great Lakes. In: Toxic Contaminants in the Great Lakes. J. Nriagu ed. Wiley Interscience (In Press)\nEadie, B. J., S. Nihart, and J. A. Robbins (1982). Study of Early Diagenesis of Compounds in Great Lakes Sediments is Underway. Coastal Ocn. and Climat.\nNews: 4 43.\nEadie, B. J., W. Faust, and P. F. Landrum. Polycyclic Aromatic Hydrocarbons in Benthic Organisms of the Great Lakes. Coastal Ocn. Poll. Ass. News: 2 4.\n11\nPROGRESS REPORT\nMarch 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104\n2. Principal Investigator: Dr. Peter F. Landrum\n3. Title: Role of Benthic Invertebrates in the Fate of Pollutants in the Great Lakes\n4. Project Summary : The objectives of this project are to determine the uptake, depuration and biotransformation rate constants for various toxic organics in Great Lakes invertebrates. A further objective is to determine the empirical relationships between the rate constants and environmental parameters such as temperature, pollutant concentration and sediment sorption. The past six months work has focused on two areas, binding of organic xenobiotics to humic and fulvic acids and the effect of environmental parameters on the toxicokinetic rate constants for Pontoporeia hoyi.\n5. Status: Studies of humics binding of organic xenobiotics were compared using a reverse phase separation technique with the dialysis technique of Carter (1982). The reverse phase technique employs the use of a Waters C-18 Sep-Pak\u00ae to separate humic bound compound from freely dissolved compound. The results between the two methods were comparable. However, a slight but consistent bias between the two methods was observed for partitioning between Aldrich@ humic acid and water (Figure 1) and various natural humic and fulvic acids and water (Figure 2). This bias was thought to occur due to failure on the dialysis system to achieve equilibrium. Comparison between the binding of Aldrich\u00ae humics and natural dissolved organic carbon (DOC) were also made (Table 1). There appeared to be less interaction between the xenobiotic and the natural DOC with compounds having low water solubility i.e. benzo (a)pyrene and pp'-DDT relative to Aldrich\u00ae binding. However, biphenyl had an increased binding in some natural waters of about two orders of magnitude relative to Aldrich\u00ae humics. Anthracene binding remains about the same with the two types of material. The log of the reverse phase partition coefficient was proportional to the log Octano1-water partition coefficient (Figure 3) and inversely proportional to the log water solubility of the various compounds (Figure 4). The correlation co- efficient for the regression was better for the correlation with log solubility than log Octanol-water partition coefficient implying that the aqueous solubility of the compound is driving the system. The method for determining binding using reverse phase separation has been sufficiently tested to be useful for examining the effect of environmental parameters on the extent of binding and the role of humic binding to bioavailability. A manuscript is in preparation on this work. Further work will focus on the relationship between binding and bioavailability.\n12\n6\nLog Reverse Phase Partition Coefficient\nDDT\nHexachloro- biphenyl\nTetrachlorobiphenyl Biphenyl\nPhthalate\n4\nAnthracene\nRegression\n-\n2\n1:1 Relationship\n0\n0\n2\n4\n6\n8\nFigure 1.\nLog Dialysis Partition Coefficient\nComparison of the log reverse phase partition coefficient vs log dialysis partition coefficient for xenobiotic binding to Aldrich\u00ae humic acids\n13\n6\nB\u0130 HR .\n\u00b7 Anth HR\nLog Reverse Phase Partition Coefficient\n\u00b7 HCB HR\nDDT LE\nDDT HR\n4\nB\u0130 LE\nAnth LE\nB HR\n2\n- Regression 1:1 Relationship\n0\n0\n2\n4\n6\n8\nFigure 2. Log Dialysis Partition Coefficient\nComparison of the log reverse phase partition coefficient vs log of the dialysis partition coefficient for xenobiotic binding to humic materials in natural waters. LE = Lake Erie and HR = Huron River\n14\n1\n6\nBa PO DDT\u00ae\nLog Humic Acid-Water Partition Coefficient\n\u00b7 HCB\nDEHP\n.TCB\nAntho\n4\nO Biphenyl\n2\n1\n0\n0\n2\n4\n6\n8\nFigure 3. Log Octanol-Water Partition Coeff.\nComparision of the log reverse phase partition coefficient for binding into Aldrich\u00ae humic acid compared with log octanol-water partition coefficient\n15\n6\nBaP\nDDT\nLog Humic Acid-Water Partition Coefficient\n-\nHCB\nTCB\nDEHP\n4\n-\nAnth\nBiphenyl\n2\n0\n-8\n-6\n-4\n-2\n0\nFigure 4. Log Water Solubility (log g \u00b7 L-1)\nComparison of the log reverse phase partition coefficient for binding to Aldrich\u00ae humic acid compound with log water solubility\n16\n1\nTable 1. Comparison of the partition coefficients determined for natural waters with those for Aldrich humic acid\nPartition Coefficient (x10-4)\n- Compound\nNatural Water\nDOC (mg L-1)\nNatural Water\nAldrich Humics\nBenzo (a)pyrene\nHuron R.\n6.1 (winter)\n3.9 \u00b1 0.2\n89.0\n(n=9)\nGrand R.\n10.7 (spring)\n5.2 \u00b1 0.4\n(n=9)\nL. Michigan\n5.5 (spring)\n1.8 \u00b1 0.3\n(n=9)\npp'-DDT\nHuron R.\n7.8 (spring)\n1.9 \u00b1 0.2\n27.0\n(n=9)\nL. Erie\n9.6 (spring)\n2.9 \u00b1 0.3 (n=7)\nAnthracene\nHuron R.\n6.1 (winter)\n0.64 \u00b1 0.05\n1.4\n(n=9)\n6.7 (spring)\n7.4 \u00b1 0.3 (n=6)\nGrand R.\n10.7 (spring)\n4.2 \u00b1 0.1 (n=9)\nL. Michigan\n5.5 (spring)\n1.6 \u00b1 0.2 (n=9)\n2,5,2',5'-\nHuron R.\n7.8 (spring)\n0.75 \u00b1 0.7\n2.5\ntetrachlorobiphenyl\n(n=6)\n2,4,5,2' ,4',5'- hexochlorobiphenyl\nHuron R.\n7.8 (spring)\n5.3 \u00b1 0.6\n9.5\n(n=9)\nBipheny1\nHuron R.\n6.7 (spring)\n48.0 \u00b1 0.7\n0.19\n(n=18)\nGrand R.\n10.7 (spring)\n22.0 \u00b1 1.0\n(n=15)\nL. Michigan\n4.7 (spring)\n17.0 \u00b1 2.0 (n=17)\nax + SE\n17\nStudies to examine the role of competing pollutants on the uptake of polycyclic aromatic hydrocarbons (PAH) revealed that reduction of the uptake rate constant occurs when small molecules are present in sufficient concentration (Table 2). The reduction in the uptake rate constant is greatest when the PAH has low water solubility (Table 3) and when the interaction occurs with less water soluble aromatic co-contaminants. There was a greater reduction at lower concentration of co-contaminant with aromatic as opposed to aliphatic or alicyclic co- contaminants of similar aqueous solubilities. These findings describe the impact. of co-contaminants on bioavailability and transport of PAH under conditions of spills or complex effluent inputs to the aquatic system. Bioavailability will be reduced in the short term. However, the stabilization of PAH in the water column- by co-contaminants will enhance the distribution of PAH and may well prolong the exposure of aquatic organisms to low levels of PAH.\nThe effects of environmental parameters on the toxicokinetics of polycyclic aromatic hydrocarbons in Pontoporeia hoyi continue to be investigated. Studies repeating the effect of temperature confirmed the results found previously with anthracene. For BaP, anthracene and 2,5,2', 5'-tetrachlorobiphenyl (TCB) the uptake rate constant increased at the rate of approximately 10 ml . g-1.h-1. \u00bac-1. However, the biphenyl uptake rate constant was not dependent on temperature. All the com- pounds had increased elimination rate constants with temperature except the TCB that had no measurable depuration. This is contrary to results previously reported for anthracene. However, the animals used in these studies did not appear to be as stressed from the high temperature as those used previously. Seasonal variation in the uptake rate constant for all compounds except biphenyl was similar to that previously reported for anthracene. The depuration rate constant may also be seasonally dependent, decreasing in the summer and increasing in the fall and winter.\nUptake of PAH sorbed to sediment has been examined for both anthracene and BaP. Anthracene uptake was most confusing. The uptake of the compound was very rapid and remained at a fixed concentration over the subsequent 18-19 days. Since the depuration half life is 9.3 days, anthracene should have contined to accumulate in the animal over the entire course of the experiment. More research on this compound is required.\nBaP uptake from sediment has been examined three times and the uptake rate constant was determined to be 1.0(+0.4) x10-3 g dry sed .g wet animal --. h-1. Using this result and the seasonal average uptake rate constant from water 111+50 ml.g wet animal-1.h -- and average depuration rate constant 1.99(+0.9) x10-3h-1; the steady state concentration for Pontoporeia hoyi was predicted from measured concentrations of BaP in sediment and water from three sites in Lake Michigan. The predicted concentrations compared with the measured values (Table 4).\nThe largest error in uptake is that of the uptake from water resulting from both the rate constant, because of the seasonal variability, and the water concentration due to the extremely low levels with the subsequently large analytical error. Further studies of uptake from sediment are necessary to define the size fraction responsible for uptake. Also, other PAH will have to be studied for development of emperical relationships between compounds.\n18\nTABLE 2\nINHIBITION OF BENZO(A) PYRENE UPTAKE IN PONTOPOREIA HOYI BY SMALL MOLECULES\nCompound\nI, 50 (mg.L -1)\nLog P\nWater Solubility (mg\u00b7L-1)\nToluene\n0.74\n2.70\n470\nBenzene\n5.0\n2.13\n820\nHexane\n2.5\n3.19\n138\nCyclohexane\n5.0\n2.39\n55\nEthylacetate\n>10\n0.73\n86,000\nAcetone\n>100\n-0.24\n**\n** Totally miscible\n19\nTABLE 3\nCONCENTRATION OF TOLUENE RESULTING IN FIFTY PERCENT REDUCTION IN UPTAKE RATE CONSTANT OF PAH FOR PONTOPOREIA HOYI\nCompound\nToluene If * 50\n(mg.L-1)\nWater Solubility (21) (ng\u00b7mL-1)\nBenzo (a)pyrene\n0.74\n3.8\nAnthracene\n2.2\n74\nBipheny1\n10 **\n8080\n*I50 = Concentration of co-contaminant resulting in a 50% 50 reduction in uptake rate constant\n** No effect at highest concentration tested 10 mg.L-1 of toluene\n20\nTABLE 4\nMEASURED AND PREDICTED CONCENTRATIONS OF BENZO (A) PYRENE FOR THREE SITES IN LAKE MICHIGAN\nSite* Sediment Concentration\nPontoporeia Concentration\nPredicted\nMeasured\nng.g dry weight-1\nng . g wet animal-I\nHi Sed\n400\n647\u00b1205 **\n900\n45m Station\n40\n466\u00b1115\n400\n24m Station\n30\n461+112\n280\n*The 45m and 24m Stations are just south of Grand Haven. The Hi Sed site is near South Haven\n** 1SD determined from the errors of the rate constants. The water concentration used for these predictions was held constant at 0.008 ng.ml-1\n21\n6. References:\nCarter, C. W. and I. H. Suffet (1982). Binding of DDT to dissolved humic materials. Environm. Sci. Techno1. 16:735-740.\n7. Products:\nLandrum, P.F. (1982). Uptake, depuration and biotransformation of anthracene by the scud, Pontoporeia hoyi. Chemosphere 11:1049-1057.\nLandrum, P.F. (1983). The effect of co-contaminants on the bioavailability of polycyclic aromatic hydrocarbons to Pontoporeia hoyi. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium, Battelle Press. (In Press)\n.\nEadie, B. J., P. F. Landrum, W. R. Faust, N. R. Morehead, W. S. Gardner and T. Nalepa (1983). Bioconcentrations of PAH by some benthic organisms of the Great Lakes. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium,\nBattelle Press. (In Press)\nSpacie, A., P. F. Landrum, and G. J. Leversee (1983). Rates of uptake, depuration and biotransformation of anthracene and benzo (a)pyrene in fish. Ecotoxicology and Environmental Safety. (In Press)\n8. Presentations:\nLandrum, P. F. 1982. Influence of competing pollutants on the bioavailability of benzo(a)pyrene to Pontoporeia hoyi. 7th International Symposium on Polynuclear Aromatic Hydrocarbons, October 26-28, Columbus, Ohio.\nEadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner and T. Nalepa. 1982. Bioconcentrations of PAH by some benthic organisms of the Great Lakes. 7th International Symposium on Polynuclear Aromatic Hydrocarbons. October 26-28, Columbus, Ohio.\nLandrum, P. F., S. R. Nihart, B. J. Eadie and W. S. Gardner. 1982. Reverse Phase Separation Method for Determining Pollutant Binding in Aldrich Humic Acid and Dissolved Organic Carbon of Natural Waters. 3rd Annual Meeting of Society of Environmental Toxicology and Chemistry. November 14-17, Washington, D. C.\nLandrum, P. F. (1982). Fate of Polynuclear Aromatic Hydrocarbons in Aquatic Organisms. Department of Environmental Toxicology, University of California, Davis. December 14, 1982.\n22\nPROGESS REPORT\nMarch, 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA\n2300 Washtenaw Avenue Ann Arbor, MI 48104\n- 2. Principal Investigator: John A. Robbins\n3. Title: Application of particle-associated radiotracers to studies of the transport and fate of aquatic microcontaminants\n4. Project Summary: There are two central aims of this project: (1) to characterize sedimentation and sediment integration processes as a basis for quantitative interpretation of sediment contaminant distributions and (II) to characterize vertical transport processes in the water column and calibrate models for the vertical distribution of contaminants with particular emphasis on the benthic nepheloid region.\nFor part (I) cores are being collected from the high sedimentation areas of each of the Great Lakes and analyzed radiometrically to determine rates of sediment reworking and sedimentation. Radiometric methods have been shown to provide a measure of the extent of sediment homogenization by organisms inhabiting the upper 1-10 cm. This mixing process is of major importance in determining the efficiency with which contaminants are buried and removed from contact with overlying water. The mixing of contaminant-laden surface sediments is one of the major factors affecting persistence of contaminants in the Great Lakes. By careful examination of cores from the high sedimentation areas and in adjacent areas with significantly lower rates of sedimentation and differing mixing characteristics, it is expected that diagenetic models can be built which include the principal physical transport processes and distinguish between time-dependent changes in the rate of contaminant deposition and post-depositional chemical transformations. For part (II) radiometric measurements are being made on trap and water samples with the aim of inferring particle residence times and re- suspension fluxes in various segments of the water column on a seasonal basis.\n5. Status: Part I. Box and gravity cores have now been obtained in the high sedi- mentation areas of all lakes but Superior. Samples from Lake Ontario were collected by personnel from the Canada Centre for Inland Waters (CCIW) in June 1981. Cores from Lakes Erie, Huron, and Michigan were collected aboard the R/V Simons in October 1981 by GLERL staff members (J. Robbins) and individuals under contract (K. Johansen, University of Michigan; S. Eisenreich, University of Minnesota), as well as scientists from CCIW and elsewhere. In June 1982, addi- tional cores were collected in Lake Erie aboard the CCIW ship CCS Limos by GLERL and CCIW personnel. At this point many of the cores from Lakes Ontario, Erie and Michigan have been catalogued and analyzed for dry weight, radionuclides\n23\n(cesium-137, lead-210), major and minor elements, and organic contaminants. Cores from Huron are further back in the queue, but have been logged, freeze- dried, and analyzed for radionuclides. The radionuclide analysis shows that the cores are of a quality which merit the full analysis for major and minor elements and organic compounds proposed by the study.\nWithin the past six months we have completed analysis of Cs and Be in 137 7 additional cores from Lake Erie. The results provide strong clues as to the nature of sediment focusing and mixing processes. Integrated amounts of Cs\nand Be in three cores are given in Table 1 along with decay-corrected amounts entering the lakes from the atmosphere. In the case of 13 Cs the total deposition on the lake surface from about 1950 to the time of collection of the cores is approximately 10 dpm/cm2. In the Lake Michigan core and in the core from the central basin of Lake Erie (G16) the total amount is roughly 30 dpm/cm2, or more than three times the atmospheric loading. In the eastern basin where sedimen- tation rates are extraordinarily high, the amount of 137Cs stored is nearly an order of magnitude higher than the atmospheric loading. As the radionuclide is deposited essentially uniformly on the lake surface and other sources are negligible, its preferential accumulation in areas of high sedimentation indicates the extreme degree of long term contaminant focusing which occurs in the Great Lakes sediments. Now look at the behavior of another short-lived radionuclide in the same cores. The standing crop of the cosmogenic radionuclide, Be(t]=53.4 days), is expected to be about 2.3 dpm/cm- whereas the measured amount in the three cores ranges from 0.8 to 1.1 dpm/cm2. As can bee seen in Table 1, the ratio of amount in the core to the standing crop shows relatively little variability in the three cores. Moreover, far less of the amount present in the lake system resides in the sediments. This latter effect is most likely due to the residence time of the radionuclide in overlying waters: a considerable fraction decays before arrival at the sediment-water interface. The absence of strong focusing of this isotope, which probably possesses hydrodynamic characteristics comparable to those of 13 Cs, suggests that on time scales comparable to the half-life of Be, deposition is relatively uniform over the lake bottom. These results indicate that particle associated radionuclies with half-lives of the order of a few months to a few years are of value in chronicling the sequence of deposition and resuspension which results in preferential accumulation of contaminants in the low energy regions of the lake bottom.\nThe vertical profile of 137 Cs in the high sedimentation core (LS) is shown in Figure 1. The distribution is remarkable in that the peak corresponding to the 1963-1964 maximum in fallout to the lake surface occurs so deep in the core (around 20 cm). In most other areas of the Great Lakes, the entire profile is confined to the upper 10 to 15 cm or less. The extraordinarily high sedimentation rates in the eastern end of Lake Erie make the area particularly valuable for this present study. In some of the other 1982 cores from this part of the lake, the peak appears to occur below the bottom of the box core at about 40 cm! In Figure 1 the line which approximately follows the data points is the result_of our steady-state mixing model calculation. The calculation assumes that 137 Cs added to sediments is instantaneously mixed with previous inputs over a depth of fixed thickness which moves upward as new sediments are added. From the figure\n24\nit can be seen that the extent of mixing resulting from least squares evaluation of the mixed depth and sedimentation rate is about 6 cm in this core. This is the zone over which the activity is expected to be constant.\nComparison with actual data shows that significant details in the profile are not reproduced by the model although the general shape of the profile is. Note that the shaded area in the figure is the profile expected in the absence of mixing. Careful consideration of the figure will convince you that the structure apparent in the unmixed profile between 0 and 12 cm is seen in the actual data. This correspondence is seen in other cores from this area as well. Our conclusion from these observations is that when sedimentation rates are high, mixing is in- complete and that in areas of high sedimentation, we have access to details which allow us to develop more realistic models of how sediment mixing occurs. Further evidence for the incompleteness of sediment mixing can be seen in Figure 2. In the lower panel is a profile of Be in the same core. Far from being uniformly mixed over 6 cm, the activity decreases expoentially to undetectable levels within the upper two centimeters of the core. Currently we are developing a kinetic model of sediment mixing which takes account of the way which the oligochaete worms, abundantly present in these sediments, actually redistribute particles. Because of their conveyor belt feeding mode, they introduce an advective component into the sediment reworking process. This model development is important in character- izing the time scales for sediment contaminant-water interactions.\nPart II. Within the past few months we have completed the pilot study of radio- nuclide fluxes determined from sediment traps placed in 100 m of water 34 km west of Grand Haven, Michigan in Lake Michigan. Samples were collected for eight approximately monthly intervals from April through December at 4 to 7 water depths. All samples have now been analyzed for 137 Cs and both surface and near-bottom trap samples have been analyzed for 'Be.\nMass flux profiles for the eight sampling periods shown in Figure 3 are typical of open lake stations. Prior to stratification (April-May and May-June), fluxes are essentially uniform in the water column. With the onset of stratification, fluxes decrease drastically throughout the water column but remain high in the bottom-most trap (5-20 m off the bottom). Consistently high fluxes near the bottom result from local and non-local resuspension processes. Distributions of the activity of 13 Cs in the same samples are shown in Figure 4. The significance of the results can be understood in terms of the geochemistry of this isotope and its history of loading in the lake. Very little 13 Cs is currently coming into the lake. During the sampling period the average deposition rate was about 1 dpm/m2/d as compared with the 1963 peak fallout rate of 170 dpm/m2/d. Because of the short residence time of the radionuclide in the lake, 95% of the total load now resides in the sediments. 137Cs is strongly associated with clay minerals to which it may be irreversibly bound. Therefore, most of the 137Cs present in trap materials is likely to originate from sediments and is an indicator of the amount of resuspended materials. During the prestratification period (April-May) the activity of the isotope is essentially uniform in trap materials throughout the water column. As stratification progresses, the activity in samples from the\n25\nupper part of the water column vanishes. Particles from the epilimnion entering the traps do not carry 137 Cs and the resuspended component is relegated to bottom waters with the reduction in turbulent mixing which accompanies stratification of the lake. During November to December, as surface waters turn over, the 13/Cs activity again reappears in near surface samples.\nFluxes of the two isotopes during the isothermal period are summarized in Table 2. For 137 Cs, surface traps yield a flux of 130 dpm/m2/d and bottom traps a flux of 270 dpm/m2/d. Thus, the flux of 13 Cs through the water column ranges from about 120 to 250 times the current rate of loading from the atmosphere. Clearly resuspension of bottom materials during the isothermal period_is of enormous importance in the cycling of contaminants in the lake. For Be the picture is different as can be seen in Table 2. The trap fluxes of the isotopes is about half the atmospheric flux in surface waters and comparable to the atmospheric flux in the near-bottom traps. Fluxes are expected to be lower than atmospheric fluxes because of the scavenging efficiency and radioactive decay effects for beryllium. Application of a box model to 137Cs fluxes during the isothermal period suggest that the isotope is resuspended out of a mixed layer approximately 40 mg/cm- in thickness. This layer thickness is also implied by fluxes of 'Be during the isothermal period.\nThe activity of Be in surface trap materials is shown in Figure 5. Large un- certainties accompany the values because of the very small amount of material collected during stratification. In a model system with an abrupt onset of stratification of fixed depth and constant residence time, the activity of Be should build up in epilimnetic trap materials throughout June and then fall off slightly in the remaining months prior to fall overturn. The actual results show a drastic early reduction in activity which begins in July-August. While the reasons remain to be determined, most likely it is due to enhanced scavenging of the radionuclide by plankton and by authigenic calcite. In bottom traps which\ncollect predominantly resuspended materials throughout the whole season, the activity of Be decreases expoentially after stratification sets in (Figure 6). In contrast, the activity of\"> Cs increases slightly (about 15%) over the same period. The exponential decrease suggests that when the lake is stratified, new inputs of Be to the pool of resuspendable sediments is sharply curtailed. Furthermore, if there were no additions of the isotope during this period and no losses from the pool to unresuspendable sediments, then the activity in the pool should decrease with a half-life equal to the half-life of the isotope it- self. Within experimental error this is in fact the case. As seen in Figure 6, the activity in the trap material decreases with an apparent half-life of 54\u00b16 days. Much further work will be done to determine the geochemical characteristics of 7Be, its particle affinities, and the extent to which its behavior may be indicative of the behavior of contaminants in the water column and the benthic nepheloid layer in particular.\n6. Papers presented:\nRobbins, J. A. Bioturbation and lake recovery times. Invited paper, 30th Annual Meeting of the North American Benthological Society, Ann Arbor, Michigan, May 18-21, 1982. Abstracts, p. 7.\n26\nRobbins, J. A. and B. J. Eadie. Beryllium-7: A tracer of seasonal particle transport processes in Lake Michigan. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982.\nJohansen, K. A. and J. A. Robbins. Use of Be-7 Ce-144, and Cs-137 to characterize short term mixing processes and rates in Great Lakes sediments. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982.\n.\n-7. Other talks:\nUse of 7Be and 137Cs in studies of seasonal particle transport processes in aquatic systems.\nCosmogenic Be and fallout 137Cs in Lake Michigan: behavior of two radionuclides with contrasting half-lives. Seminar at the Great Lakes Environmental Research Laboratory, Ann Arbor, MI, February 17, 1983\n8. Abstracts generated and accepted for future talks:\nRobbins, J. A. and B. J. Eadie. Seasonal cycling for Be-7 and Cs-137 in the benthic nephloid layer of Lake Michigan. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nRobbins, J. A., K. A. Johansen. Beryllium-7: A tracer of short term sediment mixing processes in the Great Lakes. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nRossman, R., R. A. Bourbonniere, K. A. Johansen, and J. A. Robbins. Vertical variation of metals in dated Lake Ontario sediment cores. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nJohansen, K. A., R. Rossman, and J. A. Robbins. History of lead and mercury deposition in lead-210 and cesium-137 dated cores from eastern Lake Ontario. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nEisenreich, S. J., P. D. Chapel, J. A. Robbins, and R. A. Bourbonniere. Chlorinated hydrocarbon concentrations and fluxes in sediment cores from eastern Lake Ontario. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nSchelske, C. L., E. F. Stoermer, D. J. Conley, J. A. Robbins, and R. M. Glover. Sedimentary evidence for anthropogenic modifications of silica cycles in the Great Lakes. 26th Conference on Great Lakes Research, Oswego, N. Y. , May 24-26, 1983. (Accepted) .\n27\nHugel, E., and J. A. Robbins. Seasonal variations in the activity of\npolonium-210 in sediment trap samples from Lake Michigan. 26th Conference on Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).\nKeilty, T. and J. A. Robbins. Are tubificid abundances in Lake Erie sediments controlled by the rate of supply of organic carbon? 46th Annual Meeting of the American Society of Limnology and Oceanography, St. Johns, Newfoundland, June 13-16, 1983.\n9. Articles submitted, in press or published:\nRobbins, J. A. Stratigraphic and dynamic effects of sediment reworking by Great Lakes zoobenthos. In: Developments in Hydrology 9, Sediment/Fresh- water Interaction, Ed. P. G. Sly. Proc. of the 2nd International Symposium on Sediment-Water Interactions, Kingston, Ont. Hydrobiologia 92 (1982) 611-622.\n28\nTable 1 CUMULATIVE RADIONUCLIDE DEPOSITION DATA\nLocation\nVariable\nLM-81 HS\nLE-82\nG16\nLE-82 LS\nCs137 (dpm/cm2)\nLake-wide loading\n9\n10\n10\nIn sediment cores\n30\n33\n85\nRatio (sed/lake)\n3.3\n3.3\n8.5\nBe7(dpm/cm2)\nLake-wide loading*\n\u20aa2.3\n22.3\n22.3\nIn sediment cores\n1.0\n0.8\n1.1\nRatio (sed/lake)\n0.43\n0.35\n0.48\n*Approximately the standing crop - flux/1. 2 = 0.693/53.4 days\n29\n4\nTable 2 RADIONUCLIDE FLUXES AS DETERMINED FROM SEDIMENT TRAPS\n(Lake Michigan, Stn. 7, May-June, 1982. Unstratified Lake. )\nSurface Traps (10-20 m)\nNear-bottom Traps (80-95 m)\nBeryllium-7:\nActivity (dpm/g)\n22.8 \u00b1 4\n22.5 \u00b1 2\nFlux (dpm/m2/d)\n150 \u00b1 30\n260 \u00b1 30\nFTrap/FAir\n0.5\n0.9\nCesium-137:\nActivity (dpm/g)\n20.4 \u00b1 0.6\n23.6 \u00b1 0.4\nFlux (dpm/m2/d\n130 \u00b1 4\n270 \u00b1 5\nFTrap/FAir\n120\n250\n*Water Depth: 100 m.\n30\n-\nCs-137 (dpm /g)\n.\n5\n10\n15\n20\n2\n4\n6\n8\n10\n12\nDEPTH (cm)\n14\n16\n18\n20\n22\n24\n26\n28\n30\nLAKE ERIE 1982 LS\n32\n34-\nFI T\n31\nACTIVITY (dpm/g)\n0.5\n1.0\n2.0\n5.0\nO\n1\nBERYLLIUM-7 IN\n0.5\nSEDIMENT CORES\n0.1\nLAKE ERIE 1982\n-\n1.0\n1\n0.2\n1.5\nDEPTH (cm)\nCUMULATIVE WEIGHT (g/cm2)\n2.0\n0.3 -\n2.5\n0.4F 0\n-0.5\n0.1\n-1.0\n0.2- rt =1.1g/cm2/yr\nDEPTH (cm)\n-1.5\n0.3 -\n-\n0.4\nLS\n32\n-\nrt=0.72g/cm2/yr\nG 16\nFij 2\n0\nApr 27-May 27|May 27-June 16 June 16-July 23\nJuly 23-Aug 17\n1982\n20\nWATER DEPTH (m)\n40\n60\n80\nAug 17 - Sept 13|Sept 13 - Oct 27 Nov 1 - Nov 17\nNov 17 - Dec 15\n20\nWATER DEPTH (m)\n40\n60H\n80\n0.1 1.0 10 0.1 1.0 10 0.1 1.0 1.0 0.1 1.0 10 MASS FLUX (g/m2/d)\nFes 3\n33\nC\nApril 27 - May 17\nMay 17 - June 16\nJune 16 - July 23\nJuly 23 - Aug 17\n20\n-\n1\nI\n40\nO\n60\n80-\nHH\n1\nH\nO\nDEPTH (m)\nO\nAug 17 - Sept 13\nSept 13 - Oct 27\nNov 1 - Nov 15\nNov 15 - Dec 17\n201\n34\nT\n40\n1\nL\n60-\nH\n80-\nPH\n100\nO\n10\n20\n0\n10\n20\nO\n10\n20\nO\n10\n20\nACTIVITY OF TRAP MATERIAL (dpm/g)\nFag .\n1\nH\nH\nH\n. .\n120\nLAKE MICHIGAN STATION 7(1982) 10-20M TRAP\n-\nACTIVITY\n-- o -- Cs-137\n-\u00b7- Be -7\n+ T\n40 -\nI\n4\nT\n0\n+\nA\nM\nJ\nJ\nA\nS\nO\nN\nD\nMONTH\n1\n35\nACTIVITY (dpm/g)\n80\n1\n7 Be IN NEAR-BOTTOM SEDIMENT TRAPS\n50\n11/2 = 54 \u00b1 6 days\n20-\nACTIVITY (dpm/g)\n10\n1\n51\nLAKE MICHIGAN STATION 7, 1982 ( 0 80m , \u00b7 95 m)\n1\nA M\nJ\nJ\nA\nS\nOND\nMONTH\nFig.6.\n36\nPROGRESS REPORT\nAPRIL, 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104\n2. Principal Investigator: Michael J. McCormick\n3. Title: Vertical Dynamics of Toxic Organics in the Great Lakes\n4. Project Summary: The objectives of this project are twofold: (1) to quantitatively described the decomposition pathways of persistent contaminants, and (2) to improve such models by identifying and then minimizing the major sources of prediction errors. A one-dimensional model has been completed and used to investigate the Mirex problem in Lake Ontario. Current efforts are focused on error analyses and on improving the predictability of submodels detailing vertical mixing and photodecomposition.\n5. Status: Over the past six months progress has been made on process parame- terizations and error analyses. In particular, a global radiation model (Atwater and Brown, 1974) using cloud information from coastal meteorological stations on Lake Michigan has been programmed and is currently being compared against measured solar radiation data from Madison, Wisconsin. This model will be used to improve estimates of both photodecomposition losses and the intensity of vertical mixing. Both processes are strongly dependent upon knowing the irradiance which, in general, must be modeled due to the sparse radiation gathering network in the Great Lakes region.\nError analyses have been performed on two models to examine transport uncertainty on prediction estimates. A preliminary error analysis dealt with leakage of Mirex from the sediments of Lake Ontario into the water column and its vertical transport therein. The results suggest gross uncertainty in particle associated concentrations of Mirex in surface waters, during winter, and suggests that vertical eddy diffusion is a major error source. The other model dealt with uncertainty in nutrient regeneration rates in Lake Michigan. In this case horizontal advection was a major error source. Comparison of vertically to horizontally associated errors indicates an error dominance due to horizontal variability. Therefore, guidelines are being developed to provide minimum estimates of error bounds for different applications of horizontal averaged one-dimensional models.\nError analyses have motivated additional work on vertical mixing. Comparisons have been made between two eddy diffusion models of McCormick and Scavia (1981) and Henderson-Sellers (1980). The results indicate similarities under three conditions: (1) constant current shear, (2) high Richardson number, and (3) low wind speed. Differences occur in treatment of low diffusion situations which may significantly affect rate loss estimates in the toxic's model.\n37\nResolving discrepencies in the two approaches is an ongoing problem with alternative methods being addressed. The most hopeful approach involves an integral type model (Pollard et al. 1973) to estimate vertical mixing and is currently being implemented for Lake Michigan.\nProducts are listed under separate title.\n6. References:\nAtwater, M. A. and P. S. Brown, Jr. (1974) Numerical Computations of the Latitudial Variations of Solar Radiation for an Atmosphere of Varying Opacity. J. Appl. Met. 13:(2), 289-297.\nHenderson-Sellers, B. (1980) Limnological Modelling: Simulation of Vertical Profiles to Temperature, Dissolved Oxygen and Nutrients. I. Theory. J. Limnol. Soc. Sth. Afr., 6, 49-54.\nMcCormick, M. J. and D. Scavia (1981) Calculation of Vertical Profiles of Lake-Averaged Temperature and Diffusivity in Lakes Ontario and Washington. Water. Resour. Res. 17: (2), 305-310.\nPollard, R. T., P. B. Rhines and R. O. R. Y. Thompson (1973) The Deepening of the Wind-Mixed Layer. J. Geophys. Fluid Dyn., 3, 381-404.\n7. Products:\nHenderson-Sellers, B., M. J. McCormick and D. Scavia (1983) A Comparison of the Formulation for Eddy Diffusion in Two One-Dimensional Stratification Models. Appl. Math. Mod. (In Press)\nHenderson-Sellers, B. and M. J. McCormick (1983) Vertical Eddy Diffusion Formulations in One-Dimensional Thermal Stratification Models for Lakes and Reservoirs. To be presented at Fourth Inter. Conf. on Math. Mod., Zurich, Switzerland, 15 August.\nMcCormick, M. J. and S. J. Tarapchak (1983) Error Analysis of Nutrient Regeneration Rates for a Station in Southern Lake Michigan. To be presented at 26 Conf. International Assoc. for Great Lakes Res., 25 May.\n38\nPROGRESS REPORT\nApril 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104\n2. Principal Investigator: John R. Bennett and Anne H. Clites\n3. Title: Modeling the Transport of Toxic Substances\n4. Project Summary: The objective of this project is to develop methods to predict the temporal and spatial movement of toxics in the Great Lakes.\nA two-dimensional, vertically integrated model and a three-dimensional, thermally stratified model will be used to calculate currents in Lake Michigan. These currents will then drive a water quality model that will advect, diffuse, settle, and resuspend particles and dissolved substances.\n5. Status: In order to predict the motion and fate of toxics in the Great Lakes, the currents must first be known. The model wind stress and current fields will be generated by a circulation model developed by Schwab, Bennett, and Jessup (1981) for other GLERL studies.\nOur goal in this project is to use these currents to simulate the movement of dissolved and particulate-bound materials in any of the Great Lakes. Toward that end we have developed a general computer program which calculates advective motion, settling, and resuspension. This program, documented in Bennett, Clites, and Schwab (1983), uses the grid generation programs developed by Schwab and Sellers (1980) and is designed to use the currents simulated by the previously mentioned circulation model.\nThe model has been tested for pure advection using an idealized lake. Its numerical accuracy has been found to be more than adequate for our purposes. We are continuing to test the effects of settling and resuspension in idealized cases. Eventually, we intend to verify the model by comparison with data from sediment traps currently moored in Lake Michigan. Radionuclides will be used as particle tracers to infer suspended sediment transport paths. When verification of this vertically integrated model is complete, we will begin testing a three- dimensional version.\n6. References:\nBennett, J. R., A. H. Clites, and D. J. Schwab 1983. A two-dimensional lake circulation modeling system: Programs to compute particle trajectories and the motion of dissolved substances. (In press) NOAA Technical Memorandum.\n39\nSchwab, D. J. and D. L. Sellers (1980) : Computerized bathymetry and shorelines of the Great Lakes, NOAA Data Report ERL-GLERL-16, National Technical Information Service, Springfield, VA. 22151. 13 pp.\nSchwab, D. J., J. R. Bennett, and A. T. Jessup (1981). A two-dimensional lake circulation modeling system, NOAA Technical Memorandum ERL-GLERL-38, National Technical Information Service, Springfield, VA 22151. 79 pp.\n7. Products:\nBennett, J. R., A. H. Clites, and D. J. Schwab (1983). A two-dimensional lake circulation modeling system: Programs to compute particle trajectories and the motion of dissolved substances. (In press). NOAA Technical Memorandum.\n40\nPROGRESS REPORT MARCH, 1983\n1. Organization: Great Lakes Research Division and Department of Atmospheric and Oceanic Sciences The University of Michigan Ann Arbor, Michigan 48109\n2. Principal Investigators: Clifford P. Rice and Philip A. Meyers\n3. Amount of 1983 Funds: 60 K\n4. Total Project Funds to Date: 60 K\n5. Title: Partitioning and Cycling of Toxic Organics in the Great Lakes Ecosystem\n6. Project Summary: The objective of this project is to study the role particle suspension plays in the continued recycling of toxic organic compounds in the Great Lake system. Emphasis will be placed on analyses of the suspended and settling particulate portions of the samples. Both selected toxic organics, e.g. pesticides (dieldrin, DDT, etc.), PCBs, phthalates, and chlorobenzenes, and non- selective GC-MS scans will be performed. Analyses of lipid biomarkers of samples will be performed in order to follow biogeochemical cycling at the sediment/water and epilimnion/hypolimnion interfaces and in other turbidity zones, such as river plumes and coastal locations.\n7. Status: Our major effort for the chlororganic studies has been to develop methods to identify and quantitate the individual isomers which constitute the PCBs in the Lake Michigan samples. A method for packed column analysis has been devised which allows partial homologue characterizations to be made. This provides data which can be used to estimate weathering of the PCB mixtures. For exact identification of the isomers in the PCBs we are using capillary separation techniques. Because of the large amount of data generated for each analysis (i.e. 50 to 60 separate chromatographic peaks) computer processing is being used. Multiple regression statistics is used to sort the data in reconstructing best matches to Aroclor types. For identification of the isomers, peak tables are constructed from exact isomer standards.\nA preliminary scan of a Lake Michigan particulate sample on the Mass Spectrometer has identified some unusual isopropyl substituted benzene compounds, studies are continuing on these samples.\n41\nInformation about the fates of organic compounds introduced to Great Lakes is being obtained by study of natural biomarker materials and their cycling. The amounts and types of organic-carbon-containing substances\nincorporated in\nsediments of lakes are influenced by processes which accompany the sinking of particles through the water column (Meyers, et al. 1980). Organic matter\nis formed, altered, and destroyed, and that which becomes incorporated in subaqueous sediments is only a fraction of the initial material available. we have examined elemental and molecular indicators of organic matter sources and of its modification during transit to the bottom of Lake\nMichigan and in sections of dated sediment cores obtained from Lakes Michigan, Huron, Erie, and Ontario. Distribution of n-alkanol, sterol, and n-alkane biomarker compounds are dominated by aquatic components in mid-water depths, but by terrigenous components in near-surface and near-bottom depths. Surficial sediments from all locations contain similar hydrocarbon compositions which have a strong\nterrigenous character. Subsurface sediments show\nhydrocarbon distributions which appear more aquatic in\norigin. this contrast reflects a combination of selective resuspension of surficial sediment particles on the basis of\ntextural differences and microbial degradation and\nresynthesis of hydrocarbons within the lake bottoms.\nOrganic matter associated with sinking particles undergoes substantial degradation and alteration prior to deposition. Aquatic material is preferentially lost relative to land derived substances, and resuspension of bottom sediments provides renewed opportunities for further alteration.\nProgressive changes in hydrocarbon character in the cores suggests microbial activity continues deep into these lake sediments. The processes which modify and degrade natural organic compounds are likely to affect synthetic material as well. This study is improving our understanding of these processes.\nReferences\nMeyers, P.A., S.J. Edwards, and B.J. Eadie. 1980. Fatty acid and hydrocarbon content of settling sediments in Lake Michigan. J. Great Lakes Res. , 6: 331-337.\n8. Products:\nMeyers, P.A., M.J. Leenheer, B.J. Eadie, and S.J. Maule. \"Organic geochemistry of suspended and settling particulates in Lake Michigan.\" Submitted to Geochemica et Cosmochimica Acta, 3 January 1983.\nMeyers, P.A., M.J. Leenheer, and B. J. Eadie. 1983. \"Organic matter alterations during sinking of sediment\n42\nparticles in Lake Michigan.\nNorth-Central Section of the Geological Society of America, Abstract with Programs, 15:238.\nDunham, K.W., P.A. and B.J. Eadie. 1983.\nMeyers,\n\"Hydrocarbon geochemistry of sediments from Lakes Michigan, Huron, Erie, and Ontario. North-Central Section of the Geological Society of America,\nAbstracts with Programs, 15: 238.\n43\n1. Organization: Great Lakes Research Division The University of Michigan 2200 Bonisteel Blvd. Ann Arbor, MI 48109\n2. Principal Investigators: Ronald Rossmann and Kjell A. Johansen\n3. Amount of 1983 Funds: $47,125.\n4. Total Project Funds to Date: $93,231.\n5. Title: Determination of Present and Historical Fluxes in High Sedimen- tation Rate Areas of the Great Lakes.\n6. Project Summary: The sedimentary environment of deposition is being described in detail. This includes measurement of sedimentation rates, depth of surficial sediment mixing, dilution of contaminants by non- contaminated sediments, the depth of sediment oxygenation, and the flux of metal contaminants to the sediment. From these data, the post-depositional redistribution (diagenesis, physical mixing) of contaminants is described.\n7. Status: Since its inception, undisturbed Lakes Michigan, Erie, and Ontario cores have been collected or obtained through co-operation with other investigators. Analysis of the Lakes Michigan and Ontario cores is complete. That of the Lake Erie cores has begun and is expected to be completed by December 1983. A comprehensive report detailing the results of work on the Lakes Ontario and Michigan cores will be completed by June 1, 1983.\nDuring the past six months, analysis of four cores from Lake Ontario and three cores from Lake Michigan for metals has been completed. The metals include arsenic, barium, bismuth, calcium, cadmium, chromium, copper, iron, mercury, magnesium, manganese, nickel, lead, antimony, vanadium, and zinc. The depth to which surficial sediments are homogenized by physical mixing has been determined for each of the cores. For all practical purposes, this depth also represents the depth of oxygen penetration. Metals proving useful for measuring the mixed depth include manganese, copper, lead, cadmium, antimony, arsenic, mercury, and nickel. Of these, manganese appears to be the most useful. Mixed depth for the Lake Ontario cores varied between one and three centimeters and for the Lake Michigan cores varied between one-half and two and one-half centimeters.\nBecause the cores are dated by the Pb-210 technique, metal concentrations in recent sediments can be compared to mean concentrations in pre- industrial sediments (pre-1800). Those metals whose concentrations in recent sediments are consistently more than two times those in pre- industrial sediments include arsenic, bismuth, cadmium, mercury, manganese, lead, antimony, and zinc. Of these, the elements showing the highest enrichments are cadmium, mercury, and lead. The only element having no significant enrichment is magnesium.\n44\nElements exhibiting diagenetic mobility in the Lake Ontario cores include arsenic, calcium, and manganese. In the Lake Michigan cores, those exhibiting this mobility include arsenic and manganese.\nDuring the past six months, measurements and profile interpretations for cesium-137 and lead-210 have occurred. For each core, lead-210 and cesium-137 are measured, sedimentation rates are derived from the lead-210 and cesium-137 profiles, and dates are assigned to each core interval. Radiometric measurements are complete for nine cores from Lakes Ontario and Michigan. For the Lake Erie cores, cesium-137 measurements are still to be completed on one core, and lead-210 measurements are thirty percent completed.\nBased on a steady-state mixing model being applied to Lake Erie cesium-137 results, some of the highest sedimentation rates in the Great Lakes have been found, ranging from 0.079 g/cm2/yr (1.11 cm/yr) in the central basin to 0.95 g/ cm2/yr (2.78 cm/yr) in the eastern basin. The depth of physical homogenation of surficial sediments ranges from 5.2 to 13.6 cm. For one Lake St. Clair core, the sedimentation rate is 0.15 g/cm2/yr (0.32 cm/yr) with physical homogenation to a depth of 7.5 cm, giving a dating resolution of 37 years.\nBased on lead-210, the average sedimentation rates within the top ten centi- meters of cores from two Lake Ontario locations ranged from 0.039 g/ cm2/yr (0.19/cm/yr) to 0.076 g/cm2/yr (0.30 cm/yr).\nBecause all three Lake Michigan cores have perturbated lead-210 profiles, special techniques had to be used to obtain sedimentation rates and core interval dates. Perturbations of the normal exponential lead-210 profile occurred at the same depths as disturbances in the stable lead, copper, and arsenic profiles. The disturbances in these stable metal profiles are attributed to and correlate with severe storm events. By averaging segments of the lead-210 profile which appeared undisturbed and had a similar slope, characteristic sedimentation rates of 0.080, 0.054, and 0.021 g/ cm2/yr were calculated for the three Lake Michigan cores. The resulting dates for intervals in each core confirm the coincidence of major sediment disturbances and major storm events for the years or year groupings of 1835, 1845, 1860, and 1869; 1905; 1913; 1916, 1918, and 1919;\n1940; 1954; and 1958. Re-examination of the Lake Ontario cores also confirms the coincidence of major sediment disturbances and major storm events for the years or year groupings of 1780; 1811; 1835, 1845, and 1860; 1869; 1905; 1913, 1916, 1918, and 1919; 1940; 1952, 1954, and 1958; and 1971. The coincidence of stable metal and lead-210 profiles perturbations in cores from Lakes Ontario and Michigan confirms the relationship between profile perturbations and storm events. Indeed, the greatest disturbance in the cores occurred in the Lake Michigan cores during the well-documented 1954 seiche.\n45\n9. Products :\nRossmann, R., K. A. Johansen, and R. A. Bourbonniere, 1982. Geochemistry of Lake Ontario sediments. In: B. J. Eadie, et al., in press. The cycling of toxic organics in the Great Lakes. A three year status report. NOAA Technical Memorandum ERL GLERL-37.\nJohansen, K. A., and R. Rossmann, 1982. Trace elements in Lake Ontario\ncores . In: B. J. Eadie, et al., in press. The cycling of toxic organics in the Great Lakes. A three year status report. NOAA Technical Memorandum ERL GLERL-37.\nRossmann, R. , K. A. Johansen, R. A. Bourbonniere, and J. A. Robbins, submitted. Vertical variation of metals in dated Lake Ontario sediment cores. XXVI Annual Conf. Great Lakes Res., Internat. Assoc. Great Lakes Res ., Oswego, New York.\nJohansen, K. A., R. Rossmann, and J. A. Robbins, submitted. History of Pb and Hg deposition in Pb-210 and Cs-137 dated cores from eastern Lake Ontario. XXVI Annual Conf. Great Lakes Res., Internat. Assoc. Great Lakes Res., Oswego, New York.\n46\nPROGRESS REPORT\nMarch 1983\n1. Principal Investigator: Mila S. Simmons\n2. Affiliation: Department of Environmental & Industrial Health The University of Michigan\n3. Amount of 1982 Sponsored Funds: $43,200\n.\n4. Total Project Funds through 1982: $126,800\n5. Title: Photochemical Degradation & Transformation Studies of Toxic Organics in the Great Lakes\n6. Project Summary: The overall objective of this research project is to conduct studies on the photochemical degradation of toxic organics. Kinetic rate constants of the photolytic process for PCBs and PAHs under natural and artificial sunlight will be incorporated in a model which will describe the cycling, transport and fate of toxic organics in the Great Lakes.\n7. Status: Photolysis rate experiments in both natural and artificial sunlight have been conducted and decomposition rates and quantum yields for individual chlorobiphenyl isomers have been calculated.\nCurrent work in progress includes the effects of microlayer, humic acids and CaCO particulates on the photolytic degradation of PAH in aquatic systems. Lake Michigan microlayer and water samples were taken on (5/20/81, 6/5/81, 6/24/81, and 8/3-5/81) at depths 1 and 10 meters. Characterization of the microlayer by GC/MS (with capillary column) revealed the presence of the high molecular weight long- chain and aromatic hydrocarbons which were practically eliminated when the samples were irradiated with a 5 Mrad dose of gamma rays. The radiation exposure was conducted to kill bacteria and plantonic materials that might change the micro- layer composition and affect the photolysis rates of the PCBs and PAHs. Work comparing irradiated vs. non-radiated microlayer effects on the photodegradation process are in progress.\nSunlight experiments using naphthalene at two concentrations showed a decrease of the degradation rate in Lake Michigan water compared to distilled water. Two concentrations of naphthalene in Lake Michigan microlayer showed a further decrease by a factor of two of the photolytic rate compared with deeper waters (table 8). Further studies of naphthalene with Lake Michigan water and 10, 50 and 100 ppm CaCO3 showed an increase in the observed rates.\nOn the contrary, addition of 1, 5 and 20 ppm humic acid to Lake Michigan water showed a slight decrease in the rates.\nWe investigated the effect that algae (Scenedemus) grown in our laboratory might have in the photolytic rate of naphthalene. A marked increase in the photode- composition rate of naphthalene in the presence of Cyclotella vs. Lake Michigan\n47\nwater was observed and further pursued. Growth medium only exhibited a decomposition rate for naphthalene comparable to that observed in Lake Michigan water. The addition of non-living Cyclotella to the growth medium showed a marginally increased rate compared to the growth medium alone. Thus it appears that algal exudates must exhibit an only marginal effect on the photolytic processes. Instead, the mechanism appears interconnected with the photo- synthetic capacity of the cells. In any case, the importance of this process in natural systems is most important as an efficient degradation pathway of toxic organic compounds.\n.\n48\nPROGRESS REPORT\nAPRIL, 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Ave. Ann Arbor, MI 48104\n2. Principal Investigator: David S. White Great Lakes Research Division University of Michigan Ann Arbor, MI 48109\n3. Amount of 1983 Funds: $19.8 K\n4. Total Amount of Projects Funds to Date: $19.8 K\n5. Title: Redistribution of Sediment-Bound Toxic Organics by Benthic Invertebrates\n6. Project Summary: The principal object of the project is to determine the movement of toxic organics through fine-grained sediments as mediated by aquatic oligochaete feeding. This involves the determination of both mixing and burial rates which will be of primary importance in models of long-term lake recovery. Secondary in the experiments is the determination of the effects of the toxicants (in this case PCBs) on the mixing and burial processes themselves. These primarily are laboratory studies using microcosms and radiotracers and the two dominant Great Lakes' aquatic oligochaete species Stylodrilus heringianus (an \"oligotrophic\" indicator) and Limnodrilus hoffmeisteri (a \"eutrophic\" indicator) .\n7. Status: To this point, two major activities have occurred. The first has been an evaluation of two preliminary experiments using 14c labeled PCBs with Stylodrilus and Limnodrilus in the microcosms. We have shown that the two species have differing but predictable responses to a range of a specific PCB isomer and that their actions in redistribution of the PCBs can be monitored. That is, we have separated the movements of 137Cs labeled sediments from the final distribution of the 14C labeled isomer. Further, we have determined the range of isomer concentration that seems to stress the more oligotrophic Stylodrilus. We do not yet know this range for Limnodrilus.\nSecondly, the above results have allowed us to produce a design for a series of more closely controlled experiments on the redistribution, net accumulation and uptake kinetics of PCBs by these two dominant aquatic oligochaetes. At this point we have redesigned and are rebuilding the microcosms for two sets of experiments to begin around the first of April when fresh collections of oligochaetes will be available from Lake Michigan.\n9. Products: Two products have come from the research thus far. The first is a manuscript on the PCB-Stylodrilus preliminary experiment which will be submitted for review and possible publication this spring. The second is a dissertation proposal by T. Keilty who will use much of the data generated here for his doctoral research.\n49\nPROGRESS REPORT\nApril, 1983\n1. Organization: Great Lakes Environmental Research Laboratory NOAA\n2300 Washtenaw Avenue Ann Arbor, Michigan 48104\n2. Principal Investigator: John P. Giesy\n3. Amount of 1983 Funds: $17,484\n4. Total Projects Funds to Date: $17,484\n5. Title: Changes in the Free Amino Acid Pool of Benthic Invertebrates as a Sublethal Toxic Response to Pentachlorophenol\n6. Project Summary:\nThe objective of this project is to develop non-specific biochemical measures of chemically induced sublethal, chronic stress in benthic organisms from the Great Lakes. Initially we will be examining the response of the free amino acid pools and glycogen concentrations of the amphipod Gammarus fasciatus and the annelid, Stylodrilus heringianus. We are examining the seasonal and spatial variability of the FAA in samples of these species from the Great Lakes as well as changes due to exposure to pentachlorophenol in laboratory studies.\n7. Status:\nAfter discussion with the other members of the toxic organics working group of the GLERL-OMPA program we decided to change the emphasis of our initial proposal. Initially, we had proposed to examine clams from the Great Lakes. After study and discussion, we determined that the amphipods and benthic worms were more important organisms and developing a general measure of stress in these organisms would be more appropriate. To that end we have developed a strategy of examining the FAA pool as an integrative measure of changes, energy reserves and metabolic pathways in response to toxic substances.\nOur initial efforts have been to design our test protocols for the entire study period. This has been completed as a complete study protocol presented to the study group. These protocols were discussed at our last meeting and several areas of interaction with other projects developed.\nWe have made several collecting trips out on the lakes during the past year and have developed our laboratory rearing techniques.\nWe have adapted several statistical techniques to be able to profile the relative concentrations of all of the individual amino acids in the FAA. Previous attempts to use the FAA pool as a measure of stress have met with limited\n50\nsuccess because, depending upon the toxicant and its mode of action, some amino concentrations increase, while others decrease. Thus, measuring the total FAA concentration or calculating individual rations is not a very powerful tool. The use of profile analysis and calculation of Euclidean distances (equation 1) will allow us to utilize all of the information from changes in individual free amino acids (Figure 2).\n20\nD\nAt\n\u03a3\n(x\ni,t\ni=1\n- X i, t + Dt' 2 1/2 (1)\nwhere:\ni represents each individual free amino acid concentration\nt = time\nAt = change in time period\nMonitoring the Euclidean distance will allow us to compare changes from the steady state homeostatic range. We will also be able to measure the resistance and resilience of populations of organisms.\n8. Since we have only been funded since January our primary product has been our experimental protocol and development of our rearing techniques.\n51\n1\n(A )\n(B) } Steady State\nS\nE. D. (FAA )\n1\n(C )\n2\n4\n6\n7\n12\n14\n16\nTime (wks. )\nFIGURE 2\nHypothetical example of how Euclidean Distances (E.D.) may fluctuate in organisms under stress. B - normal operating range or steady state conditions, A and C - two potential patterns for organisms under stress.\n52\nSemi-Annual Project Report\nApril 1983\n1. Principal Investigator: Dr. Steven J. Eisenreich\n2. Affiliation: Environmental Engineering Program Department of Civil and Mineral Engineering University of Minnesota Minneapolis, MN 55455\n.\n3. Amount of 1981 funds: $40,000\n4. Total project funds through 1982: $73,000\n5. Title: Toxic Organic-Sediment Dynamics in the Great Lakes\n6. Project Summary: The overall objective of this research project is to examine the processes responsible for the accumulation, transformations and movement of toxic organics in the sediments of the Great Lakes. To this end, detailed sediment cores obtained with an oceanographic box corer and benthos corer from high and low sedimentation regions of each of the Great Lakes will be carefully examined for stratigraphic variations in concentration and transformed species of initially selected chlorinated hydrocarbons. Initial studies will emphasize PCBs, DDT-group compounds, lindane, and 3 to 4 additional compounds selected on the basis of occurrence in the core and known preference for sediment (i. e., compounds having a range of Kow, Koc, etc. )\nThe diagenesis of PCBs in each core will be examined by careful analysis for up to 30 PCB isomers. Over depth increments in high sedimentation regions corre- sponding to periods of constant input, in situ degradation/transformation rates may be obtained.\nPore water isolated from depth intervals of box cores will be analyzed for organics above and PAHs to evaluate the importance of diffusion/advection of hydrophobic pollutants to overlying water.\n7. Status: The project to date is on schedule. The project was begun in 1981, with an intensive sampling trip on the Great Lakes. Box cores were obtained in high and low sedimentary regions of Lakes Erie and Huron and by benthos coring in Lake Michigan. Box cores were divided into as many as 16 sub-cores, two of which from each site were dedicated to this project. In all, eight box core splits, nine benthos cores and two sub-cores from Lake Ontario (courtesy of CCIW, Dr. Bourbonniere) were collected. Each core was sectioned into 1 cm depth intervals in the uppermost 20 cm, and every 2 cm thereafter. Sectioned cores were stored frozen until analysis.\n53\nThe distribution of Mirex and total PCBs are shown in Figure 1 for the Lake Ontario high sed core. The dashed lines in each case are distributions computed using the steady state mixing model and annual U. S. production figures for the source function. In the case of Mirex there may be a strong regional source. Apparently a major quantity of the compound was introduced into a tributary to western Lake Ontario and this pulse reached the mouth around 1963. Shown in Figure 1 as the solid line is the distribution expected to result from a slug of . Mirex deposited in 1970. There is roughly a seven-year difference between the optional model date the estimated time of introduction. The difference is worth :\nfollowing as it may be important for understanding in-lake processes: some explanations worth considering include: predominance of other more distributed sources, delay in appearance of signal at the offshore location, processes of external integration of the signal as a competitor to local integration (mixing).\nIn the case of the PCBs little relation is expected between annual production numbers and profiles. Distributions of individual isomers generally have an appearance similar to the total PCB profile but ratios of specific isomers to total PCBs group systematically. The four chlorinated isomers generally have ratios which decrease less with increasing sediment depth than to the five chlorinated isomers. Similarly, the six chlorinated isomers decrease more rapidly than their five chlorinated counterparts. This behavior is interpreted as due to a higher postdepositional mobility of the lower chlorinated species (S. Eisenreich). Evidently modelling the behavior of these compounds in sediments will require the use of diffusion/advection models with isomer-dependent parameter values.\n54\nCONCENTRATION (ng/g )\nCONCENTRATION (ng /g )\nO\n200\n400\nO\n20\n40\n60\n1980\nO\n1\n-\n1970\nCUMULATIVE DRY WEIGHT (g/cm2)\n1\n1960\n2\n1950\nYEAR (A.D.)\nTOTAL PCBs\nTOTAL MIREX\n1940\n3\n1930\n4\n1920\nFigure 1. Distribution of mirex and total PCBs in the Lake Ontario cores. The dashed line in each case is the distribution predicted from total sales figures for the compounds. The solid curve for mirex is the distribution expected for a pulse entering the lake around 1970. As the PCBs show sediment degradation rates or mobility which depend on isomeric composition, any relation between sediment profiles and production figures must be considered fortuitous. Distribution of PCBs will ultimately be treated in terms of specific isomers.\n55\nPROGRESS REPORT April 1983\n1. Organization: Radiological and Environmental Research Division Argonne National Laboratory Argonne, Illinois 60439\n2. Principle Investigator: Donald M. Nelson\n3. Amount of 1983 Funds: $20 K\n4. Total Project Funds to Date: $20 K\n5. Title: Removal of Radionuclides from Watersheds of the Great Lakes\n6. Project Summary: The objective of this research is to measure the transport of the fallout radionuclides 90Sr, 137Cs, and 239Pu into the Great Lakes via rivers. This information is needed as input to models describing the cycling of these elements within the lakes.\n7. Status : Four rivers draining into Lake Michigan have been chosen for\nstudy: Manistee, Menomonee, Grand, and St. Joseph. These are to be sampled four times during the year. The first two samplings were completed in early November and early February. Sample analyses from November are nearly complete and these results are presented in Table 1. Also presented for comparison are typical values for Lake Michigan. In each instance the river concentrations are comparable to, or lower than, corresponding lake concentrations. The highest concentrations are, in general, associated with the Menomonee River and probably reflect the paucity of exchangeable cations in its watershed as well as the elevated concentrations of dissolved organic carbon (and hence natural complexing ligands) in the water. These initial findings are consistent with our supposition that rivers are not major sources of these radionuclides to the Great Lakes. No obstacles are foreseen which would interfere with the completion of this project.\n8. References :\n9. Products :\n56\n\u0647\n3\nTable 1\n239Pu\n137Cs\n90gr\npH\nConductivity u mohs/cm\nAlkalinity mg/L\nDOC ppm\nSuspended Load mg/L\nWater fCi/L\nParticles fCi/mg\nWater fCi/L\nParticles fCi/mg\nWater fCi/L\nParticles fCi/mg\nManistee\n7.7\n308\n140\n5.7\n5.1\n0.01\n0.009\n34\n0.67\n70\nnc\nMenomonee\n7.2\n150\n80\n12.5\n2.6\n0.59\n0.078\n42\n2.31\n410\nnc\nGrand\n7.4\n490\n210\n6.5\n28\n0.04\n0.009\n30\n0.43\n240\nnc\nSt. Joseph\n7.6\n330\n210\n5.7\n27\n0.10\n0.012\n22\n0.56\n140\nnc\n57\nLake Michigan\n8.2\n250\n110\n1-2\n<2\n0.4\n0.2\n30\n5 800\n0.1\nnc = not completed.\n11\nPROGRESS REPORT\nAPRIL, 1983\nA\n=\n1. Organization: Oak Ridge National Laboratory P.O. Box X Oak Ridge, TN 37830\n2. Principal Investigator: James E. Breck\n3. Amount of 1983 Funds: $40 K\n4. Total Project Funds to Date: $40 K\n5. Title: Models for the Behavior and Fate of Long-lived Contaminants in the Upper Trophic Levels of the Great Lakes\n6. Project Summary: The objective of this project is to develop and analyze models for simulating contaminant concentrations in Great Lakes fishes; this will include an evaluation of the relative contributions of direct uptake from water, pelagic food chain pathways, and benthic food chain pathways. Initial work has focused on simulating the accumulation of PCBs by alewives, the dominant forage fish in Lake Michigan, using a bioenergetics modeling approach.\n7. Status: Progress has been made in several areas of this project since it was initiated approximately six months ago. First, a bioenergetics model in FORTRAN was modified to permit simulation of PCB accumulation by alewives from water and from multiple prey types (Mysis, Pontoporeia, copepods, and cladocerans), and preliminary simulation results were obtained. These preliminary results are very encouraging, since the simulated PCB concen- trations in the first few years of life are very close to the observed PCB concentrations in Lake Michigan alewives (approximately 1-5 ppm). These initial results indicate that the trophic uptake pathway is more important for PCB uptake than direct uptake from the water; the food chain pathway contributes more than 80% of the total PCBs accumulated by alewives. This can be seen in the accompanying figure, which shows the relative contri- butions of water and several prey types to the PCBs accumulated by alewives (the effects of spawning are incorporated, as discussed below). More than half of the total PCBs in alewives is estimated to have come from the benthic amphipod Pontoporeia, suggesting that the benthic food chain that includes Pontoporeia is of major importance to the bioaccumulation of PCBs by Lake Michigan alewives, and consequently, by their salmonid predators.\n=\nSecond, information on PCB concentrations in Lake Michigan alewives and invertebrates is being compiled from several published and unpublished sources. Jim St. Amant (Wisconsin Department of Natural Resources) has provided a computer listing of the PCB data for Lake Michigan fishes that the WDNR has collected from 1976 through 1982. An initial list of 61 values of PCBs in Lake Michigan alewives includes these data.\nThird, discussions were held in Madison, Wisconsin, with people working on growth models for alewives (Drs. James F. Kitchell and Steve Hewett, both of the Center for Limnology, University of Wisconsin-Madison) and with others collecting data on contaminant accumulation by fishes (Dr. Jack Sullivan, State Hygiene Lab and Department of Water Chemistry, University of Wisconsin; also Mr. Lee Liebenstein and Mr. Jim St. Amant, Wisconsin\n58\nDepartment of Natural Resources). A visit was also made to NOAA/GLERL in Ann Arbor, Michigan, to discuss this research project with GLERL staff members, to present initial results, and to foster closer integration of this modeling effort with other parts of the toxics program.\nFourth, spawning has recently been implemented in the bioaccumulation model to account for this loss of biomass and contaminants. Simulations have been done in which spawning losses are 10.3% of the female body weight (Norden, 1967). Accounting for spawning losses has several effects on simulated PCB concentration in alewives. Since simulated alewives must now consume more food in order to match the observed weight at age, there is an increase in prey consumption. This leads to an increase in the importance of the food chain pathway relative to direct upatke from the water, and a slight increase in the benthic food chain pathway relative to the pelagic food chain pathway.\nThe most significant aspect of spawning in these initial simulations is that spawning provides a mechanism for loss of contaminants from fish. This is especially important for PCBs in fish since other workers have recently shown that depuration rates of the more highly chlorinated PCBs are extremely low, approaching zero. The accompanying figure shows the effect on alewife PCB concentration of different values of the ratio of PCB concentration in the spawned eggs / whole-body PCB concentration; ratio values used were 0, 0.5, 1.0, and 1.5. When the ratio is less than 1.0 there is an increase in alewife PCB concentration after spawning, since the remaining body burden of contaminants is then concentrated in a smaller biomass. Ratios of .5 - 1.5, which are more realistic (Niimi, in press), all lead to lower estimates of PCBs in alewives than do simulations which do not have spawning. As can be seen in the accom- panying figure, consideration of spawning losses of contaminants is especially important for estimating contaminant concentrations in older fish, and spawning may be a dominant loss mechanism for long-lived fish species such as lake trout.\n8. References :\nNorden, C. R. (1967) Age, Growth and Fecundity of the Alewife, Alosa pseudoharengus (Wilson), in Lake Michigan. Trans. Am. Fish. Soc. 96: 387-393.\nNiimi, A. J. Biological and Toxicological Effects of Environmental Contaminants in Fish and their Eggs. Can. J. Fish. Aquat. Sci. (in press).\n9. Products: none yet.\n59\n6\nPERCENT OF ALEWIFE PCB FROM WATER & EACH PREY TYPE. SPAWNING LOSSES ARE INCLUDED, BUT NO LONG-TERM ELIN.\n100-\n\u00a2\n=\nwater\ncladocerans\n80\ncopepods\nR\nC\nE\nN\n60-\nT\nF\nR\n0\nM\nE\nA\nC\nH\n40\nS\nPontoporcia\nU\nR\n20\nMysis\n0-\n0\n1\n2\n3\n4\n5\n6\n7\n8\nS\n10\nTIME (YR)\n60\nV\nALEWIFE PCB CONC. VARYING PCB CONCENTRATION IN SPAWNED EGGS FROM O TO 1.5 X WHOLE-BODY CONC.\n20\n18\n16\nM\n14\nH\n0\nL\nE\n-\n12.\nB\n0\nY\n10-\nC\n0\nN\nC\n8-\nP 1 \u05d8\u05f3 \u05d8\u05be\nM 1.0\nM\n6-\n1.5\n)\n4\n11\n2-\n0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\nTIME (YR)\n-\n1\n- -\n- 1.5\nLEGEND: RELCON\n0\n- 0.5\nMAM .\n. .\n/AW 0.5\n-\n61\nGLERL LIBRARY - Ann Arbor 5 0778 01000189 9\nTD 427 The cycling of toxic .07 organic substances in G7 the Great Lakes Ecosystem. Apr 83 Semiannual Report.\nISSUED TO\nDATE\nGLERL LIBRARY\n",
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                    "content": "Cerium 144. There is a large data base on the distribution of these com-",
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                    "content": "The column marked M is to represent those",
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                    "content": "Progress reports on these individual projects follow:",
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                    "content": "Deep",
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                    "content": "Sediments",
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                    "content": "phase, D represents dissolved phase, and B is an abbrevi-",
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                    "content": "ated food web.",
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                    "content": "The 15 process arrows are:",
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                    "content": "1.",
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                    "content": "Photolysis",
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                },
                {
                    "content": "Air-water exchange",
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                    ]
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                {
                    "content": "4.",
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                },
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                    "content": "Grazing and fecal pellet generation",
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                    ]
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                {
                    "content": "5.",
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                    ]
                },
                {
                    "content": "Filtering",
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                    ]
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                {
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                    "content": "Photolysis",
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                {
                    "content": "7.",
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                    ]
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                {
                    "content": "Biological decomposition",
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                {
                    "content": "Settling and resuspension",
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                {
                    "content": "10.",
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                    "content": "Transport and dispersion",
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                    "content": "Biological decomposition",
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                    "content": ". .",
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                {
                    "content": "causes.",
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                    "content": "be",
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                {
                    "content": "analyzed",
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                {
                    "content": "more",
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            "lines": [
                {
                    "content": "PROGRESS REPORT",
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                {
                    "content": "April, 1983",
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                {
                    "content": "1.",
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                {
                    "content": "Organization:",
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                {
                    "content": "Great Lakes Environmental Research Laboratory",
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                {
                    "content": "NOAA",
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                },
                {
                    "content": "2300 Washtenaw Avenue",
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                },
                {
                    "content": "Ann Arbor, MI 48104",
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                {
                    "content": "2.",
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                {
                    "content": "Principal Investigator:",
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                },
                {
                    "content": "Dr. Brian J. Eadie",
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                },
                {
                    "content": "3.",
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                },
                {
                    "content": "Title:",
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                    ]
                },
                {
                    "content": "Long-term Behavior and Fate of Polycyclic Aromatic Hydrocarbons and",
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                    ]
                },
                {
                    "content": "Other Toxic Organic Contaminants in the Great Lakes",
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                {
                    "content": "4.",
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                },
                {
                    "content": "Project Summary: The objectives of this project are 1) to develop and calibrate",
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                },
                {
                    "content": "long-term toxic cycling models for the Great Lakes and 2) to conduct experiments",
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                {
                    "content": "on processes which affect the transport of synthetic organic compounds across",
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                },
                {
                    "content": "the sediment-water interface.",
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                },
                {
                    "content": "5.",
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                {
                    "content": "Status:",
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                    "content": "Part I. During the past few months, efforts have been made to design a",
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                {
                    "content": "toxic cycling model which includes the effect of sediment resuspension and re-",
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                },
                {
                    "content": "equilibriation of sediments with the water column. Programming and testing are",
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                {
                    "content": "currently underway. This model will be calibrated with radionuclide data (Pb-210,",
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                {
                    "content": "Cs-137, Be-7) from our sediment trap program. This model is designed as a",
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                },
                {
                    "content": "coupled Great Lakes model. It will take monthly time steps and non-steady state",
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                {
                    "content": "input. Once calibrated satisfactorily with radionuclide data, case studies of",
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                {
                    "content": "toxic organics will be run. One final product will be analysis of the Great",
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                {
                    "content": "Lakes' response to loads of compounds with solubility/decomposition values",
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                {
                    "content": "ranging over several orders of magnitude.",
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                {
                    "content": "Part II. During the last winter, our sediment trap program continued",
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                {
                    "content": "with the deployment of 26 traps at five locations throughout Lake Michigan.",
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                {
                    "content": "These data will more than double our information base on the magnitude of re-",
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                {
                    "content": "suspension during the unstratified period. Analyses are scheduled for r adio-",
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                {
                    "content": "nuclides, nutrients, PAH, and chlorinated hydrocarbons.",
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                    "content": "A supplementary trap program has been conducted on a monthly basis throughout",
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                },
                {
                    "content": "the past year. Cumulative mass flux and Be-7 data for this project are shown in",
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                {
                    "content": "Robbins' report in this issue. This project will be modified to collect samples",
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                {
                    "content": "further offshore (mid-lake) on a biweekly basis during the coming year.",
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                    "content": "Our analyses of PAH in the high sed cores from Lakes Ontario and Michigan are",
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                    "content": "almost complete. The Lake Michigan core was complicated by several apparent",
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                    "content": "slumping events, making conclusions difficult. PAH in the Ontario cores show",
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                    "content": "several spikes in concentration and a buildup and eventual decay of perylene",
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                    "content": "from diagenetic causes. These data will be analyzed in more detail.",
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                    "content": "9",
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                    "confidence": 0.993,
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                        "offset": 16893,
                        "length": 8
                    }
                },
                {
                    "content": "10",
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                    "confidence": 0.999,
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                        "offset": 16902,
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                }
            ],
            "lines": [
                {
                    "content": "Several reports on PAH in the Great Lakes have been published by our group.",
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                    ]
                },
                {
                    "content": "One major result has been the finding that major Great Lakes benthic organisms",
                    "polygon": [
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                    "spans": [
                        {
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                    ]
                },
                {
                    "content": "have the ability to mobilize sedimentary PAH and that they do serve as a major",
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                        }
                    ]
                },
                {
                    "content": "food source for fish.",
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                        {
                            "offset": 14795,
                            "length": 21
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                    ]
                },
                {
                    "content": "One other major project is underway. This one is to measure the formation and",
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                    "spans": [
                        {
                            "offset": 14817,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "decomposition rates of complexes of natural organics and synthetic organics.",
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                    "spans": [
                        {
                            "offset": 14895,
                            "length": 76
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                    ]
                },
                {
                    "content": "Such complexes appear to be common in pore waters of the lakes and appear to",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 14972,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "modify the bioavailability of the synthetic compounds to benthic organisms.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 15049,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "This project will be expanded to study partitioning of synthetic organics to",
                    "polygon": [
                        0.9513,
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                        2.8682,
                        7.3236,
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                    ],
                    "spans": [
                        {
                            "offset": 15125,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "particulate matter indigenous to the Great Lakes.",
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                    "spans": [
                        {
                            "offset": 15202,
                            "length": 49
                        }
                    ]
                },
                {
                    "content": "-",
                    "polygon": [
                        8.294,
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                        2.3376,
                        8.3418,
                        2.3854,
                        8.2892,
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                    "spans": [
                        {
                            "offset": 15252,
                            "length": 1
                        }
                    ]
                },
                {
                    "content": "-",
                    "polygon": [
                        8.2749,
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                        2.8108,
                        8.3322,
                        2.8634,
                        8.2749,
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                    "spans": [
                        {
                            "offset": 15254,
                            "length": 1
                        }
                    ]
                },
                {
                    "content": "6.",
                    "polygon": [
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                        3.2937,
                        0.7744,
                        3.4132,
                        0.6023,
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                    "spans": [
                        {
                            "offset": 15256,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Presentations:",
                    "polygon": [
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                        2.1082,
                        3.308,
                        2.1082,
                        3.4371,
                        0.9465,
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                    ],
                    "spans": [
                        {
                            "offset": 15259,
                            "length": 14
                        }
                    ]
                },
                {
                    "content": "Eadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner, and T. Nalepa.",
                    "polygon": [
                        0.9465,
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                    "spans": [
                        {
                            "offset": 15274,
                            "length": 68
                        }
                    ]
                },
                {
                    "content": "1982.",
                    "polygon": [
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                        7.1993,
                        3.6952,
                        7.1993,
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                    "spans": [
                        {
                            "offset": 15343,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "Bioconcentrations of PAH by some benthic organisms of the Great Lakes.",
                    "polygon": [
                        1.1999,
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                        3.8816,
                        7.032,
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                        1.1999,
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                    "spans": [
                        {
                            "offset": 15349,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "7th International Symposium on Polynuclear Aromatic Hydrocarbons.",
                    "polygon": [
                        1.1951,
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                        6.6304,
                        4.1876,
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                    "spans": [
                        {
                            "offset": 15420,
                            "length": 65
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                    ]
                },
                {
                    "content": "October 26-28, Columbus, Ohio.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 15486,
                            "length": 30
                        }
                    ]
                },
                {
                    "content": "Eadie, B. J., J. A. Robbins, R. L. Chambers, C. P. Rice, C. Schelski, and",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 15517,
                            "length": 73
                        }
                    ]
                },
                {
                    "content": "W. Frez.",
                    "polygon": [
                        1.176,
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                        1.893,
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                    "spans": [
                        {
                            "offset": 15591,
                            "length": 8
                        }
                    ]
                },
                {
                    "content": "1982.",
                    "polygon": [
                        1.9456,
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                        2.4858,
                        4.6465,
                        2.4858,
                        4.8042,
                        1.9408,
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                    "spans": [
                        {
                            "offset": 15600,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "Sediment Trap Measurements of Resuspension and Settling",
                    "polygon": [
                        2.5001,
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                        7.228,
                        4.7278,
                        7.228,
                        4.8664,
                        2.5001,
                        4.7995
                    ],
                    "spans": [
                        {
                            "offset": 15606,
                            "length": 55
                        }
                    ]
                },
                {
                    "content": "Fluxes in Lake Michigan.",
                    "polygon": [
                        1.1712,
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                        3.222,
                        4.9954,
                        1.1664,
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                    "spans": [
                        {
                            "offset": 15662,
                            "length": 24
                        }
                    ]
                },
                {
                    "content": "Am. Soc. of Limn. and Ocn. Fall Mtg, San Francisco",
                    "polygon": [
                        3.265,
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                        7.5578,
                        4.8903,
                        7.553,
                        5.048,
                        3.265,
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                    "spans": [
                        {
                            "offset": 15687,
                            "length": 50
                        }
                    ]
                },
                {
                    "content": "Dec. 7-15.",
                    "polygon": [
                        1.1664,
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                        4.9811,
                        1.9982,
                        5.1341,
                        1.1664,
                        5.1197
                    ],
                    "spans": [
                        {
                            "offset": 15738,
                            "length": 10
                        }
                    ]
                },
                {
                    "content": "Robbins, J. A. and B. J. Eadie.",
                    "polygon": [
                        0.9274,
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                    "spans": [
                        {
                            "offset": 15749,
                            "length": 31
                        }
                    ]
                },
                {
                    "content": "Beryllium-7: A tracer of seasonal particle",
                    "polygon": [
                        3.6618,
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                        5.4018,
                        7.3044,
                        5.5452,
                        3.6618,
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                    ],
                    "spans": [
                        {
                            "offset": 15781,
                            "length": 42
                        }
                    ]
                },
                {
                    "content": "transport processes in Lake Michigan. American Society of Limnology and",
                    "polygon": [
                        1.1808,
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                        5.5691,
                        7.2184,
                        5.7125,
                        1.1808,
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                    ],
                    "spans": [
                        {
                            "offset": 15824,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982.",
                    "polygon": [
                        1.176,
                        5.6599,
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                        5.7173,
                        6.6878,
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                    ],
                    "spans": [
                        {
                            "offset": 15896,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "Landrum, P. F., S. R. Nihart, B. J. Eadie, and W. S. Gardner.",
                    "polygon": [
                        0.9131,
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                    "spans": [
                        {
                            "offset": 15963,
                            "length": 61
                        }
                    ]
                },
                {
                    "content": "1982.",
                    "polygon": [
                        6.1572,
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                        6.6161,
                        6.1953,
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                    "spans": [
                        {
                            "offset": 16025,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "Reverse",
                    "polygon": [
                        6.7834,
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                        6.0567,
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                        6.7786,
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                    "spans": [
                        {
                            "offset": 16031,
                            "length": 7
                        }
                    ]
                },
                {
                    "content": "Phase Separation Method for Determining Pollutant Binding in Aldrich\u00ae Humic",
                    "polygon": [
                        1.1664,
                        6.1666,
                        7.467,
                        6.2383,
                        7.467,
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                    "spans": [
                        {
                            "offset": 16039,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "Acid and Dissolved Organic Carbon of Natural Waters.",
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                    "spans": [
                        {
                            "offset": 16115,
                            "length": 52
                        }
                    ]
                },
                {
                    "content": "3rd Annual Meeting of",
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                        5.6935,
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                        6.4056,
                        7.4574,
                        6.5491,
                        5.6887,
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                    ],
                    "spans": [
                        {
                            "offset": 16168,
                            "length": 21
                        }
                    ]
                },
                {
                    "content": "Society of Environmental Toxicology and Chemistry.",
                    "polygon": [
                        1.1712,
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                        5.3445,
                        6.6972,
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                    "spans": [
                        {
                            "offset": 16190,
                            "length": 50
                        }
                    ]
                },
                {
                    "content": "November 14-17,",
                    "polygon": [
                        5.4544,
                        6.5443,
                        6.769,
                        6.5586,
                        6.769,
                        6.7164,
                        5.4544,
                        6.6972
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                    "spans": [
                        {
                            "offset": 16241,
                            "length": 15
                        }
                    ]
                },
                {
                    "content": "Washington, D. C.",
                    "polygon": [
                        1.1616,
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                        6.6829,
                        2.5862,
                        6.8263,
                        1.1616,
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                    "spans": [
                        {
                            "offset": 16257,
                            "length": 17
                        }
                    ]
                },
                {
                    "content": "7.",
                    "polygon": [
                        0.5784,
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                        6.9984,
                        0.7266,
                        7.1275,
                        0.5784,
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                    "spans": [
                        {
                            "offset": 16275,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Publications:",
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                    "spans": [
                        {
                            "offset": 16278,
                            "length": 13
                        }
                    ]
                },
                {
                    "content": "Eadie, B. J., Faust, W., Gardner, W. S., and Nalepa, T. (1982a) :",
                    "polygon": [
                        0.9131,
                        7.3378,
                        6.2719,
                        7.3952,
                        6.2719,
                        7.5434,
                        0.9083,
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                    "spans": [
                        {
                            "offset": 16292,
                            "length": 65
                        }
                    ]
                },
                {
                    "content": "Polycyclic",
                    "polygon": [
                        6.2814,
                        7.4,
                        7.2853,
                        7.4095,
                        7.2853,
                        7.5625,
                        6.2814,
                        7.5529
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                    "spans": [
                        {
                            "offset": 16358,
                            "length": 10
                        }
                    ]
                },
                {
                    "content": "Aromatic Hydrocarbons in Sediments and Associated Benthos in Lake Erie.",
                    "polygon": [
                        1.1521,
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                        7.0893,
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                        1.1521,
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                    "spans": [
                        {
                            "offset": 16369,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "Chemosphere 11(2) : 185-191.",
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                        1.1569,
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                        3.3224,
                        7.8445,
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                    "spans": [
                        {
                            "offset": 16441,
                            "length": 28
                        }
                    ]
                },
                {
                    "content": "Eadie, B. J., Landrum, P. F., and Faust, W.",
                    "polygon": [
                        0.9035,
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                        8.0501,
                        4.5127,
                        8.1983,
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                    "spans": [
                        {
                            "offset": 16470,
                            "length": 43
                        }
                    ]
                },
                {
                    "content": "(1982b) :",
                    "polygon": [
                        4.5748,
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                        8.0501,
                        5.3445,
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                    "spans": [
                        {
                            "offset": 16514,
                            "length": 9
                        }
                    ]
                },
                {
                    "content": "Polycyclic Aromatic",
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                        5.507,
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                        8.0835,
                        7.1037,
                        8.227,
                        5.507,
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                    "spans": [
                        {
                            "offset": 16524,
                            "length": 19
                        }
                    ]
                },
                {
                    "content": "Hydrocarbons in Sediments, Pore Water and the Amphipod Pontoporeia hoyi",
                    "polygon": [
                        1.1473,
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                        8.2461,
                        7.1132,
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                    "spans": [
                        {
                            "offset": 16544,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "from Lake Michigan. Chemosphere 11:857-858.",
                    "polygon": [
                        1.1377,
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                    "spans": [
                        {
                            "offset": 16616,
                            "length": 43
                        }
                    ]
                },
                {
                    "content": "Eadie, B. J., Rice, C. P., and Frez, W. A. (1982) :",
                    "polygon": [
                        0.8987,
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                        8.7337,
                        5.0911,
                        8.8771,
                        0.8987,
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                    "spans": [
                        {
                            "offset": 16660,
                            "length": 51
                        }
                    ]
                },
                {
                    "content": "The role of the benthic",
                    "polygon": [
                        5.1724,
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                        7.1945,
                        8.7432,
                        7.1945,
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                        5.1724,
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                    "spans": [
                        {
                            "offset": 16712,
                            "length": 23
                        }
                    ]
                },
                {
                    "content": "boundary in the cycling of PCBs in the Great Lakes.",
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                    "spans": [
                        {
                            "offset": 16736,
                            "length": 51
                        }
                    ]
                },
                {
                    "content": "pp 213-228 in: Physical",
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                            "offset": 16788,
                            "length": 23
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                    ]
                },
                {
                    "content": "behavior of PCBs in the Great Lakes. D. Mackay et al. eds., Ann Arbor:",
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                    ]
                },
                {
                    "content": "Ann Arbor Science.",
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                    ]
                },
                {
                    "content": "10",
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                    "content": "the",
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                {
                    "content": "bioavailability.",
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                    "content": "12",
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            "lines": [
                {
                    "content": "PROGRESS REPORT",
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                {
                    "content": "March 1983",
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                    "content": "1.",
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                    "content": "Organization:",
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                {
                    "content": "Great Lakes Environmental Research Laboratory",
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                    "content": "NOAA",
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                {
                    "content": "2300 Washtenaw Avenue",
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                    "content": "Ann Arbor, MI",
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                    "content": "48104",
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                    "content": "2.",
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                    "content": "Principal Investigator:",
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                    "content": "Dr. Peter F. Landrum",
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                {
                    "content": "3.",
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                {
                    "content": "Title:",
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                },
                {
                    "content": "Role of Benthic Invertebrates in the Fate of Pollutants in the",
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                    "content": "Great Lakes",
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                    "content": "4.",
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                    "content": "Project Summary :",
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                    "spans": [
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                },
                {
                    "content": "The objectives of this project are to determine the uptake,",
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                {
                    "content": "depuration and biotransformation rate constants for various toxic organics in",
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                {
                    "content": "Great Lakes invertebrates. A further objective is to determine the empirical",
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                },
                {
                    "content": "relationships between the rate constants and environmental parameters such as",
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                {
                    "content": "temperature, pollutant concentration and sediment sorption. The past six",
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                {
                    "content": "months work has focused on two areas, binding of organic xenobiotics to humic",
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                    "content": "and fulvic acids and the effect of environmental parameters on the toxicokinetic",
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                    "content": "rate constants for Pontoporeia hoyi.",
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                    "content": "5.",
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                    "content": "Status: Studies of humics binding of organic xenobiotics were compared using a",
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                    "content": "reverse phase separation technique with the dialysis technique of Carter (1982).",
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                    "content": "The reverse phase technique employs the use of a Waters C-18 Sep-Pak\u00ae to",
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                    "content": "separate humic bound compound from freely dissolved compound.",
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                    "content": "The results",
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                    "content": "between the two methods were comparable. However, a slight but consistent bias",
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                    "content": "between the two methods was observed for partitioning between Aldrich@ humic",
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                    "content": "acid and water (Figure 1) and various natural humic and fulvic acids and water",
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                    "content": "(Figure 2). This bias was thought to occur due to failure on the dialysis",
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                    "content": "system to achieve equilibrium. Comparison between the binding of Aldrich\u00ae",
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                    "content": "humics and natural dissolved organic carbon (DOC) were also made (Table 1).",
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                    "content": "There appeared to be less interaction between the xenobiotic and the natural DOC",
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                    "content": "with compounds having low water solubility i.e. benzo (a)pyrene and pp'-DDT",
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                    "content": "relative to Aldrich\u00ae binding. However, biphenyl had an increased binding in",
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                    "content": "some natural waters of about two orders of magnitude relative to Aldrich\u00ae",
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                    "content": "humics.",
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                    "content": "Anthracene binding remains about the same with the two types of material.",
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                    "content": "The log of the reverse phase partition coefficient was proportional to the log",
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                    "content": "Octano1-water partition coefficient (Figure 3) and inversely proportional to the",
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                    "content": "log water solubility of the various compounds (Figure 4). The correlation co-",
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                    "content": "efficient for the regression was better for the correlation with log solubility",
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                    "content": "than log Octanol-water partition coefficient implying that the aqueous solubility",
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                    "content": "of the compound is driving the system. The method for determining binding using",
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                    "content": "reverse phase separation has been sufficiently tested to be useful for examining",
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                    "content": "1:1 Relationship",
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                    "content": "Log Dialysis Partition Coefficient",
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                    "content": "Comparison of the log reverse phase partition coefficient vs log",
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                    "content": "of the dialysis partition coefficient for xenobiotic binding to",
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                    "content": "Biphenyl",
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                    "content": "to Aldrich\u00ae humic acid compound with log water solubility",
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                        1.3672
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                    "spans": [
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                    ]
                },
                {
                    "content": "occurs when small molecules are present in sufficient concentration (Table 2).",
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                },
                {
                    "content": "The reduction in the uptake rate constant is greatest when the PAH has low water",
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                {
                    "content": "solubility (Table 3) and when the interaction occurs with less water soluble",
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                {
                    "content": "aromatic co-contaminants. There was a greater reduction at lower concentration",
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                {
                    "content": "of co-contaminant with aromatic as opposed to aliphatic or alicyclic co-",
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                {
                    "content": "contaminants of similar aqueous solubilities. These findings describe the impact.",
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                {
                    "content": "of co-contaminants on bioavailability and transport of PAH under conditions of",
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                {
                    "content": "spills or complex effluent inputs to the aquatic system. Bioavailability will be",
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                {
                    "content": "reduced in the short term. However, the stabilization of PAH in the water column-",
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                    "content": "by co-contaminants will enhance the distribution of PAH and may well prolong the",
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                    "content": "exposure of aquatic organisms to low levels of PAH.",
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                {
                    "content": "The effects of environmental parameters on the toxicokinetics of polycyclic",
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                },
                {
                    "content": "aromatic hydrocarbons in Pontoporeia hoyi continue to be investigated.",
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                    "content": "Studies",
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                },
                {
                    "content": "repeating the effect of temperature confirmed the results found previously with",
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                },
                {
                    "content": "anthracene. For BaP, anthracene and 2,5,2', 5'-tetrachlorobiphenyl (TCB) the uptake",
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                    ]
                },
                {
                    "content": "rate constant increased at the rate of approximately 10 ml . g-1.h-1. \u00bac-1. However,",
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                },
                {
                    "content": "the biphenyl uptake rate constant was not dependent on temperature. All the com-",
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                },
                {
                    "content": "pounds had increased elimination rate constants with temperature except the TCB",
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                },
                {
                    "content": "that had no measurable depuration. This is contrary to results previously reported",
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                },
                {
                    "content": "for anthracene. However, the animals used in these studies did not appear to be",
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                    "content": "as stressed from the high temperature as those used previously.",
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                    "content": "Seasonal variation",
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                },
                {
                    "content": "in the uptake rate constant for all compounds except biphenyl was similar to that",
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                    "content": "previously reported for anthracene. The depuration rate constant may also be",
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                    "content": "seasonally dependent, decreasing in the summer and increasing in the fall and winter.",
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                    "content": "Uptake of PAH sorbed to sediment has been examined for both anthracene and BaP.",
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                },
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                    "content": "Anthracene uptake was most confusing. The uptake of the compound was very rapid",
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                },
                {
                    "content": "and remained at a fixed concentration over the subsequent 18-19 days. Since the",
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                {
                    "content": "depuration half life is 9.3 days, anthracene should have contined to accumulate",
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                {
                    "content": "in the animal over the entire course of the experiment.",
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                    "content": "More research on this",
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                    "content": "compound is required.",
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                {
                    "content": "BaP uptake from sediment has been examined three times and the uptake rate constant",
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                {
                    "content": "was determined to be 1.0(+0.4) x10-3 g dry sed .g wet animal --. h-1.",
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                },
                {
                    "content": "Using this",
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                },
                {
                    "content": "result and the seasonal average uptake rate constant from water 111+50 ml.g wet",
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                },
                {
                    "content": "animal-1.h -- and average depuration rate constant 1.99(+0.9) x10-3h-1; the steady",
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                {
                    "content": "state concentration for Pontoporeia hoyi was predicted from measured concentrations",
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                {
                    "content": "of BaP in sediment and water from three sites in Lake Michigan.",
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                {
                    "content": "The predicted",
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                {
                    "content": "concentrations compared with the measured values (Table 4).",
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                },
                {
                    "content": "The largest error in uptake is that of the uptake from water resulting from both",
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                {
                    "content": "the rate constant, because of the seasonal variability, and the water concentration",
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                {
                    "content": "due to the extremely low levels with the subsequently large analytical error.",
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                    "content": "Further studies of uptake from sediment are necessary to define the size fraction",
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                    "content": "responsible for uptake. Also, other PAH will have to be studied for development",
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                    "content": "of emperical relationships between compounds.",
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                    "content": "18",
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            ],
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                    "content": "TABLE",
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                    "content": "OF",
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            "lines": [
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                    "content": "TABLE 4",
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                    "content": "MEASURED AND PREDICTED CONCENTRATIONS OF BENZO (A) PYRENE FOR",
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                    "content": "THREE SITES IN LAKE MICHIGAN",
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                    "content": "Predicted",
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                    "content": "ng.g dry weight-1",
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                {
                    "content": "ng . g wet animal-I",
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                    "content": "Hi Sed",
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                },
                {
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                    ]
                },
                {
                    "content": "647\u00b1205 **",
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                    "content": "900",
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                },
                {
                    "content": "45m Station",
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                {
                    "content": "40",
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                    ]
                },
                {
                    "content": "466\u00b1115",
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                {
                    "content": "400",
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                {
                    "content": "24m Station",
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                    "content": "30",
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                },
                {
                    "content": "461+112",
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                {
                    "content": "280",
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                    "content": "*The 45m and 24m Stations are just south of Grand Haven.",
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                    "content": "The Hi Sed site is near South Haven",
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                },
                {
                    "content": "** 1SD determined from the errors of the rate constants.",
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                    "content": "The water concentration used for these predictions was",
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                {
                    "content": "held constant at 0.008 ng.ml-1",
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                    "content": "21",
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                    "content": "6.",
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                {
                    "content": "References:",
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                    "content": "Carter,",
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                    "content": "C.",
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                    "content": "W.",
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                {
                    "content": "and",
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                {
                    "content": "I.",
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                {
                    "content": "(1982).",
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                    "content": "DDT",
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                    "content": "materials.",
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                {
                    "content": "Environm.",
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                {
                    "content": "Sci.",
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                {
                    "content": "Techno1.",
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                {
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                {
                    "content": "7.",
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                {
                    "content": "Products:",
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                {
                    "content": "1982.",
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                    "content": "22",
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                    "content": "References:",
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                {
                    "content": "Carter, C. W. and I. H. Suffet (1982).",
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                            "length": 38
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                    ]
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                {
                    "content": "Binding of DDT to dissolved humic",
                    "polygon": [
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                    "spans": [
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                            "length": 33
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                {
                    "content": "materials.",
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                    "spans": [
                        {
                            "offset": 27586,
                            "length": 10
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                    ]
                },
                {
                    "content": "Environm. Sci. Techno1. 16:735-740.",
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                    "spans": [
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                            "offset": 27597,
                            "length": 35
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                    ]
                },
                {
                    "content": "7.",
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                {
                    "content": "Products:",
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                    ]
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                {
                    "content": "Landrum, P.F. (1982).",
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                    "content": "Uptake, depuration and biotransformation of anthracene",
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                    "spans": [
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                            "offset": 27668,
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                    ]
                },
                {
                    "content": "by the scud, Pontoporeia hoyi. Chemosphere 11:1049-1057.",
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                    "spans": [
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                            "offset": 27723,
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                    ]
                },
                {
                    "content": "Landrum, P.F. (1983). The effect of co-contaminants on the bioavailability of",
                    "polygon": [
                        1.0613,
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                    "spans": [
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                            "offset": 27780,
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                    ]
                },
                {
                    "content": "polycyclic aromatic hydrocarbons to Pontoporeia hoyi. In Polynuclear",
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                        1.3099,
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                    "spans": [
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                            "offset": 27858,
                            "length": 68
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                },
                {
                    "content": "Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and",
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                            "offset": 27927,
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                {
                    "content": "Biochemistry.",
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                    "spans": [
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                            "offset": 27998,
                            "length": 13
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                    ]
                },
                {
                    "content": "7th International Symposium, Battelle Press. (In Press)",
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                            "offset": 28012,
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                {
                    "content": ".",
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                            "offset": 28068,
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                {
                    "content": "Eadie, B. J., P. F. Landrum, W. R. Faust, N. R. Morehead, W. S. Gardner and",
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                {
                    "content": "T. Nalepa (1983). Bioconcentrations of PAH by some benthic organisms of the",
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                    "content": "Great Lakes.",
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                            "offset": 28222,
                            "length": 12
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                    ]
                },
                {
                    "content": "In Polynuclear Aromatic Hydrocarbons:",
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                            "offset": 28235,
                            "length": 37
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                {
                    "content": "Combustion Processes,",
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                            "offset": 28273,
                            "length": 21
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                {
                    "content": "Environmental Effects and Biochemistry.",
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                {
                    "content": "7th International Symposium,",
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                            "offset": 28335,
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                    "content": "Battelle Press.",
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                            "offset": 28364,
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                    "content": "Spacie, A., P. F. Landrum, and G. J. Leversee (1983).",
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                            "offset": 28445,
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                    "content": "depuration and biotransformation of anthracene and benzo (a)pyrene in fish.",
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                    "content": "8.",
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                    "content": "Presentations:",
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                    "content": "Landrum, P. F. 1982.",
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                {
                    "content": "of benzo(a)pyrene to Pontoporeia hoyi. 7th International Symposium on",
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                {
                    "content": "Polynuclear Aromatic Hydrocarbons, October 26-28, Columbus, Ohio.",
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                    "content": "Eadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner and T. Nalepa.",
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                    "content": "1982.",
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                    "content": "Phase Separation Method for Determining Pollutant Binding in Aldrich Humic",
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                {
                    "content": "vertical transport processes in the water column and calibrate models for the",
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                {
                    "content": "nepheloid region.",
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                {
                    "content": "For part (I) cores are being collected from the high sedimentation areas of each",
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                {
                    "content": "of the Great Lakes and analyzed radiometrically to determine rates of sediment",
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                    "content": "reworking and sedimentation. Radiometric methods have been shown to provide a",
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                    "content": "measure of the extent of sediment homogenization by organisms inhabiting the",
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                {
                    "content": "upper 1-10 cm. This mixing process is of major importance in determining the",
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                    ]
                },
                {
                    "content": "efficiency with which contaminants are buried and removed from contact with",
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                },
                {
                    "content": "overlying water. The mixing of contaminant-laden surface sediments is one of",
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                            "offset": 30742,
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                    ]
                },
                {
                    "content": "the major factors affecting persistence of contaminants in the Great Lakes. By",
                    "polygon": [
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                {
                    "content": "careful examination of cores from the high sedimentation areas and in adjacent",
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                    "content": "areas with significantly lower rates of sedimentation and differing mixing",
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                    ]
                },
                {
                    "content": "characteristics, it is expected that diagenetic models can be built which include",
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                            "offset": 31052,
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                    ]
                },
                {
                    "content": "the principal physical transport processes and distinguish between time-dependent",
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                    "content": "changes in the rate of contaminant deposition and post-depositional chemical",
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                },
                {
                    "content": "transformations. For part (II) radiometric measurements are being made on trap",
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                            "offset": 31293,
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                    ]
                },
                {
                    "content": "and water samples with the aim of inferring particle residence times and re-",
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                    ]
                },
                {
                    "content": "suspension fluxes in various segments of the water column on a seasonal basis.",
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                },
                {
                    "content": "5.",
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                    ]
                },
                {
                    "content": "Status: Part I. Box and gravity cores have now been obtained in the high sedi-",
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                    ]
                },
                {
                    "content": "mentation areas of all lakes but Superior. Samples from Lake Ontario were",
                    "polygon": [
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                },
                {
                    "content": "collected by personnel from the Canada Centre for Inland Waters (CCIW) in June",
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                {
                    "content": "1981. Cores from Lakes Erie, Huron, and Michigan were collected aboard the R/V",
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                {
                    "content": "Simons in October 1981 by GLERL staff members (J. Robbins) and individuals under",
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                {
                    "content": "contract (K. Johansen, University of Michigan; S. Eisenreich, University of",
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                {
                    "content": "Minnesota), as well as scientists from CCIW and elsewhere. In June 1982, addi-",
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                    "content": "tional cores were collected in Lake Erie aboard the CCIW ship CCS Limos by",
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                        "offset": 35908,
                        "length": 2
                    }
                },
                {
                    "content": "new",
                    "polygon": [
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                    "confidence": 0.999,
                    "span": {
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                        "length": 3
                    }
                },
                {
                    "content": "sediments",
                    "polygon": [
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                    "confidence": 0.992,
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                    }
                },
                {
                    "content": "are",
                    "polygon": [
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                    "confidence": 0.993,
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                    }
                },
                {
                    "content": "added.",
                    "polygon": [
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                    "confidence": 0.994,
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                    }
                },
                {
                    "content": "From",
                    "polygon": [
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                    "confidence": 0.992,
                    "span": {
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                        "length": 4
                    }
                },
                {
                    "content": "the",
                    "polygon": [
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                    "confidence": 0.999,
                    "span": {
                        "offset": 35941,
                        "length": 3
                    }
                },
                {
                    "content": "figure",
                    "polygon": [
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                    "confidence": 0.993,
                    "span": {
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                    }
                },
                {
                    "content": "24",
                    "polygon": [
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                    ],
                    "confidence": 0.999,
                    "span": {
                        "offset": 35952,
                        "length": 2
                    }
                }
            ],
            "lines": [
                {
                    "content": "(cesium-137, lead-210), major and minor elements, and organic contaminants.",
                    "polygon": [
                        1.133,
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                    ],
                    "spans": [
                        {
                            "offset": 32316,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "Cores from Huron are further back in the queue, but have been logged, freeze-",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32392,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "dried, and analyzed for radionuclides. The radionuclide analysis shows that",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32470,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "the cores are of a quality which merit the full analysis for major and minor",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32546,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "elements and organic compounds proposed by the study.",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32623,
                            "length": 53
                        }
                    ]
                },
                {
                    "content": "Within the past six months we have completed analysis of",
                    "polygon": [
                        1.1043,
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                        5.8037,
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                    ],
                    "spans": [
                        {
                            "offset": 32677,
                            "length": 56
                        }
                    ]
                },
                {
                    "content": "Cs and Be in",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 32734,
                            "length": 12
                        }
                    ]
                },
                {
                    "content": "137",
                    "polygon": [
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                    ],
                    "spans": [
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                            "offset": 32747,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "7",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32751,
                            "length": 1
                        }
                    ]
                },
                {
                    "content": "additional cores from Lake Erie. The results provide strong clues as to",
                    "polygon": [
                        1.1043,
                        2.1846,
                        7.1566,
                        2.2276,
                        7.1566,
                        2.371,
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                    "spans": [
                        {
                            "offset": 32753,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "the",
                    "polygon": [
                        7.1758,
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                        7.4769,
                        2.2372,
                        7.4674,
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                    ],
                    "spans": [
                        {
                            "offset": 32825,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "nature of sediment focusing and mixing processes. Integrated amounts of",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "Cs",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32901,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "and Be in three cores are given in Table 1 along with decay-corrected amounts",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 32904,
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                        }
                    ]
                },
                {
                    "content": "entering the lakes from the atmosphere. In the case of 13 Cs the total deposition",
                    "polygon": [
                        1.09,
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "on the lake surface from about 1950 to the time of collection of the cores is",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 33064,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "approximately 10 dpm/cm2. In the Lake Michigan core and in the core from the",
                    "polygon": [
                        1.0996,
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                        3.0451,
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                    ],
                    "spans": [
                        {
                            "offset": 33142,
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                        }
                    ]
                },
                {
                    "content": "central basin of Lake Erie (G16) the total amount is roughly 30 dpm/cm2, or more",
                    "polygon": [
                        1.0996,
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                    "spans": [
                        {
                            "offset": 33219,
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                        }
                    ]
                },
                {
                    "content": "than three times the atmospheric loading. In the eastern basin where sedimen-",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 33300,
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                    ]
                },
                {
                    "content": "tation rates are extraordinarily high, the amount of",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 33378,
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                        }
                    ]
                },
                {
                    "content": "137Cs stored is nearly an",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 33431,
                            "length": 25
                        }
                    ]
                },
                {
                    "content": "order of magnitude higher than the atmospheric loading. As the radionuclide is",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 33457,
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                        }
                    ]
                },
                {
                    "content": "deposited essentially uniformly on the lake surface and other sources are",
                    "polygon": [
                        1.0996,
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                    "spans": [
                        {
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                        }
                    ]
                },
                {
                    "content": "negligible, its preferential accumulation in areas of high sedimentation indicates",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 33610,
                            "length": 82
                        }
                    ]
                },
                {
                    "content": "the extreme degree of long term contaminant focusing which occurs in the Great",
                    "polygon": [
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                    "spans": [
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                            "offset": 33693,
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                    ]
                },
                {
                    "content": "Lakes sediments.",
                    "polygon": [
                        1.09,
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                    "spans": [
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                            "offset": 33772,
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                        }
                    ]
                },
                {
                    "content": "Now look at the behavior of another short-lived radionuclide in",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 33789,
                            "length": 63
                        }
                    ]
                },
                {
                    "content": "the same cores. The standing crop of the cosmogenic radionuclide, Be(t]=53.4 days),",
                    "polygon": [
                        1.1091,
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                        8.1128,
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                    ],
                    "spans": [
                        {
                            "offset": 33853,
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                        }
                    ]
                },
                {
                    "content": "is expected to be about 2.3 dpm/cm- whereas the measured amount in the three cores",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 33937,
                            "length": 82
                        }
                    ]
                },
                {
                    "content": "ranges from 0.8 to 1.1 dpm/cm2. As can bee seen in Table 1, the ratio of amount",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 34020,
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                        }
                    ]
                },
                {
                    "content": "in the core to the standing crop shows relatively little variability in the three",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 34100,
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                        }
                    ]
                },
                {
                    "content": "cores. Moreover, far less of the amount present in the lake system resides in the",
                    "polygon": [
                        1.0948,
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                    ],
                    "spans": [
                        {
                            "offset": 34182,
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                        }
                    ]
                },
                {
                    "content": "sediments. This latter effect is most likely due to the residence time of the",
                    "polygon": [
                        1.1043,
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                    ],
                    "spans": [
                        {
                            "offset": 34264,
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                        }
                    ]
                },
                {
                    "content": "radionuclide in overlying waters: a considerable fraction decays before arrival",
                    "polygon": [
                        1.09,
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                    ],
                    "spans": [
                        {
                            "offset": 34342,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "at the sediment-water interface. The absence of strong focusing of this isotope,",
                    "polygon": [
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                        7.8594,
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                    ],
                    "spans": [
                        {
                            "offset": 34422,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "which probably possesses hydrodynamic characteristics comparable to those of",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 34503,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "13 Cs, suggests that on time scales comparable to the half-life of Be, deposition",
                    "polygon": [
                        1.0852,
                        6.0376,
                        7.9598,
                        6.0662,
                        7.9598,
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                    ],
                    "spans": [
                        {
                            "offset": 34580,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "is relatively uniform over the lake bottom. These results indicate that particle",
                    "polygon": [
                        1.0996,
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                        7.8833,
                        6.2479,
                        7.8833,
                        6.4009,
                        1.0996,
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                    ],
                    "spans": [
                        {
                            "offset": 34662,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "associated radionuclies with half-lives of the order of a few months to a few",
                    "polygon": [
                        1.09,
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                        6.4152,
                        7.6299,
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                    ],
                    "spans": [
                        {
                            "offset": 34743,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "years are of value in chronicling the sequence of deposition and resuspension",
                    "polygon": [
                        1.09,
                        6.5586,
                        7.5439,
                        6.5825,
                        7.5439,
                        6.7307,
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                    ],
                    "spans": [
                        {
                            "offset": 34821,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "which results in preferential accumulation of contaminants in the low energy",
                    "polygon": [
                        1.09,
                        6.7259,
                        7.453,
                        6.7546,
                        7.453,
                        6.9028,
                        1.09,
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                    ],
                    "spans": [
                        {
                            "offset": 34899,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "regions of the lake bottom.",
                    "polygon": [
                        1.0852,
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                        6.898,
                        3.3465,
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                    ],
                    "spans": [
                        {
                            "offset": 34976,
                            "length": 27
                        }
                    ]
                },
                {
                    "content": "The vertical profile of",
                    "polygon": [
                        1.0517,
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                        2.9783,
                        7.2374,
                        2.9783,
                        7.3808,
                        1.0517,
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                    ],
                    "spans": [
                        {
                            "offset": 35004,
                            "length": 23
                        }
                    ]
                },
                {
                    "content": "137",
                    "polygon": [
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                        3.3178,
                        7.2852,
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                    ],
                    "spans": [
                        {
                            "offset": 35028,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "Cs in the high sedimentation core (LS) is shown in",
                    "polygon": [
                        3.3082,
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                        7.4913,
                        7.2709,
                        7.4913,
                        7.4191,
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                    ],
                    "spans": [
                        {
                            "offset": 35032,
                            "length": 50
                        }
                    ]
                },
                {
                    "content": "Figure 1. The distribution is remarkable in that the peak corresponding to the",
                    "polygon": [
                        1.047,
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                        7.6586,
                        7.4478,
                        7.6586,
                        7.6007,
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                    ],
                    "spans": [
                        {
                            "offset": 35083,
                            "length": 78
                        }
                    ]
                },
                {
                    "content": "1963-1964 maximum in fallout to the lake surface occurs so deep in the core",
                    "polygon": [
                        1.0517,
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                    ],
                    "spans": [
                        {
                            "offset": 35162,
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                        }
                    ]
                },
                {
                    "content": "(around 20 cm). In most other areas of the Great Lakes, the entire profile is",
                    "polygon": [
                        1.0661,
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                        7.5678,
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                    ],
                    "spans": [
                        {
                            "offset": 35238,
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                        }
                    ]
                },
                {
                    "content": "confined to the upper 10 to 15 cm or less. The extraordinarily high sedimentation",
                    "polygon": [
                        1.047,
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                        7.9024,
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                        7.9024,
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                    ],
                    "spans": [
                        {
                            "offset": 35316,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "rates in the eastern end of Lake Erie make the area particularly valuable for",
                    "polygon": [
                        1.0422,
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                    ],
                    "spans": [
                        {
                            "offset": 35398,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "this present study. In some of the other 1982 cores from this part of the lake,",
                    "polygon": [
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                    "content": "is",
                    "polygon": [
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                    "confidence": 0.997,
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                    }
                },
                {
                    "content": "essentially",
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                },
                {
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                },
                {
                    "content": "in",
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                    "confidence": 0.996,
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                },
                {
                    "content": "trap",
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                    "confidence": 0.992,
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                },
                {
                    "content": "materials",
                    "polygon": [
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                    "confidence": 0.993,
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                    }
                },
                {
                    "content": "throughout",
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                    "confidence": 0.995,
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                    }
                },
                {
                    "content": "the",
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                    "confidence": 0.999,
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                    }
                },
                {
                    "content": "water",
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                    "confidence": 0.997,
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                    }
                },
                {
                    "content": "column.",
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                    }
                },
                {
                    "content": "As",
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                    }
                },
                {
                    "content": "stratification",
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                    "confidence": 0.994,
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                },
                {
                    "content": "progresses,",
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                },
                {
                    "content": "the",
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                    "confidence": 0.994,
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                    }
                },
                {
                    "content": "activity",
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                },
                {
                    "content": "in",
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                    "confidence": 0.998,
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                    }
                },
                {
                    "content": "samples",
                    "polygon": [
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                    "confidence": 0.993,
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                },
                {
                    "content": "from",
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                    "confidence": 0.989,
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                    }
                },
                {
                    "content": "the",
                    "polygon": [
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                    "confidence": 0.999,
                    "span": {
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                    }
                },
                {
                    "content": "25",
                    "polygon": [
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                    "confidence": 0.997,
                    "span": {
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                    }
                }
            ],
            "lines": [
                {
                    "content": "it can be seen that the extent of mixing resulting from least squares evaluation",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 35955,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "of the mixed depth and sedimentation rate is about 6 cm in this core. This is",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 36036,
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                        }
                    ]
                },
                {
                    "content": "the zone over which the activity is expected to be constant.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 36114,
                            "length": 60
                        }
                    ]
                },
                {
                    "content": "Comparison with actual data shows that significant details in the profile are",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 36175,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "not reproduced by the model although the general shape of the profile is. Note",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 36253,
                            "length": 78
                        }
                    ]
                },
                {
                    "content": "that the shaded area in the figure is the profile expected in the absence of",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 36332,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "mixing. Careful consideration of the figure will convince you that the structure",
                    "polygon": [
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                        7.8663,
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                    ],
                    "spans": [
                        {
                            "offset": 36409,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "apparent in the unmixed profile between 0 and 12 cm is seen in the actual data.",
                    "polygon": [
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                    "spans": [
                        {
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                        }
                    ]
                },
                {
                    "content": "This correspondence is seen in other cores from this area as well. Our conclusion",
                    "polygon": [
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                        7.943,
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                    "spans": [
                        {
                            "offset": 36570,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "from these observations is that when sedimentation rates are high, mixing is in-",
                    "polygon": [
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                        7.7896,
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                    ],
                    "spans": [
                        {
                            "offset": 36652,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "complete and that in areas of high sedimentation, we have access to details which",
                    "polygon": [
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                        2.9713,
                        7.8663,
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                    ],
                    "spans": [
                        {
                            "offset": 36733,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "allow us to develop more realistic models of how sediment mixing occurs. Further",
                    "polygon": [
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                        7.8519,
                        3.1438,
                        7.8519,
                        3.278,
                        1.0594,
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                    ],
                    "spans": [
                        {
                            "offset": 36815,
                            "length": 80
                        }
                    ]
                },
                {
                    "content": "evidence for the incompleteness of sediment mixing can be seen in Figure 2. In",
                    "polygon": [
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                        3.3067,
                        7.7081,
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                    "spans": [
                        {
                            "offset": 36896,
                            "length": 78
                        }
                    ]
                },
                {
                    "content": "the lower panel is a profile of Be in the same core. Far from being uniformly",
                    "polygon": [
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                        7.6889,
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                    "spans": [
                        {
                            "offset": 36975,
                            "length": 77
                        }
                    ]
                },
                {
                    "content": "mixed over 6 cm, the activity decreases expoentially to undetectable levels within",
                    "polygon": [
                        1.045,
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                        3.6326,
                        7.9478,
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                    ],
                    "spans": [
                        {
                            "offset": 37053,
                            "length": 82
                        }
                    ]
                },
                {
                    "content": "the upper two centimeters of the core. Currently we are developing a kinetic",
                    "polygon": [
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                        3.8052,
                        7.5211,
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                    ],
                    "spans": [
                        {
                            "offset": 37136,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "model of sediment mixing which takes account of the way which the oligochaete worms,",
                    "polygon": [
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                        8.0964,
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                    ],
                    "spans": [
                        {
                            "offset": 37213,
                            "length": 84
                        }
                    ]
                },
                {
                    "content": "abundantly present in these sediments, actually redistribute particles. Because",
                    "polygon": [
                        1.0498,
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                        7.78,
                        4.1406,
                        7.78,
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                    "spans": [
                        {
                            "offset": 37298,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "of their conveyor belt feeding mode, they introduce an advective component into",
                    "polygon": [
                        1.0498,
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                    "spans": [
                        {
                            "offset": 37378,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "the sediment reworking process. This model development is important in character-",
                    "polygon": [
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                        7.943,
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                    ],
                    "spans": [
                        {
                            "offset": 37458,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "izing the time scales for sediment contaminant-water interactions.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 37540,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "Part II.",
                    "polygon": [
                        1.045,
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                        1.7497,
                        4.9457,
                        1.7497,
                        5.1087,
                        1.045,
                        5.1087
                    ],
                    "spans": [
                        {
                            "offset": 37607,
                            "length": 8
                        }
                    ]
                },
                {
                    "content": "Within the past few months we have completed the pilot study of radio-",
                    "polygon": [
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                        7.7752,
                        4.9841,
                        7.7752,
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                    ],
                    "spans": [
                        {
                            "offset": 37616,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "nuclide fluxes determined from sediment traps placed in 100 m of water 34 km west",
                    "polygon": [
                        1.0354,
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                        5.1518,
                        7.8615,
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                    ],
                    "spans": [
                        {
                            "offset": 37687,
                            "length": 81
                        }
                    ]
                },
                {
                    "content": "of Grand Haven, Michigan in Lake Michigan.",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 37769,
                            "length": 42
                        }
                    ]
                },
                {
                    "content": "Samples were collected for eight",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 37812,
                            "length": 32
                        }
                    ]
                },
                {
                    "content": "approximately monthly intervals from April through December at 4 to 7 water depths.",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 37845,
                            "length": 83
                        }
                    ]
                },
                {
                    "content": "All samples have now been analyzed for",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 37929,
                            "length": 38
                        }
                    ]
                },
                {
                    "content": "137",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 37968,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "Cs and both surface and near-bottom",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 37972,
                            "length": 35
                        }
                    ]
                },
                {
                    "content": "trap samples have been analyzed for 'Be.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 38008,
                            "length": 40
                        }
                    ]
                },
                {
                    "content": "Mass flux profiles for the eight sampling periods shown in Figure 3 are typical",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 38049,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "of open lake stations. Prior to stratification (April-May and May-June), fluxes",
                    "polygon": [
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                        7.7752,
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                    ],
                    "spans": [
                        {
                            "offset": 38129,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "are essentially uniform in the water column. With the onset of stratification,",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "fluxes decrease drastically throughout the water column but remain high in the",
                    "polygon": [
                        1.0546,
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                        7.6074,
                        6.6614,
                        7.6074,
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                    ],
                    "spans": [
                        {
                            "offset": 38288,
                            "length": 78
                        }
                    ]
                },
                {
                    "content": "bottom-most trap (5-20 m off the bottom). Consistently high fluxes near the",
                    "polygon": [
                        1.0498,
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                        6.8292,
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                    "spans": [
                        {
                            "offset": 38367,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "bottom result from local and non-local resuspension processes. Distributions of",
                    "polygon": [
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                        7.7704,
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                    "spans": [
                        {
                            "offset": 38443,
                            "length": 79
                        }
                    ]
                },
                {
                    "content": "the activity of 13 Cs in the same samples are shown in Figure 4. The significance",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "of the results can be understood in terms of the geochemistry of this isotope and",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "its history of loading in the lake. Very little 13",
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                        }
                    ]
                },
                {
                    "content": "bottom waters with the reduction in turbulent mixing which accompanies",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 39642,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "stratification of the lake. During November to December, as surface waters",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 39713,
                            "length": 74
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                    ]
                },
                {
                    "content": "turn over, the 13/Cs activity again reappears in near surface samples.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 39788,
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                    ]
                },
                {
                    "content": "Fluxes of the two isotopes during the isothermal period are summarized in",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 39859,
                            "length": 73
                        }
                    ]
                },
                {
                    "content": "Table 2. For",
                    "polygon": [
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                        2.3471,
                        2.1465,
                        2.4714,
                        1.0517,
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                            "offset": 39933,
                            "length": 12
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                    ]
                },
                {
                    "content": "137",
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                    "spans": [
                        {
                            "offset": 39946,
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                    ]
                },
                {
                    "content": "Cs, surface traps yield a flux of 130 dpm/m2/d and bottom traps",
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                            "offset": 39950,
                            "length": 63
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                    ]
                },
                {
                    "content": "a flux of 270 dpm/m2/d. Thus, the flux of 13 Cs through the water column ranges",
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                    "spans": [
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                            "offset": 40014,
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                    ]
                },
                {
                    "content": "from about 120 to 250 times the current rate of loading from the atmosphere.",
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                    "spans": [
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                            "offset": 40094,
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                    ]
                },
                {
                    "content": "Clearly resuspension of bottom materials during the isothermal period_is of",
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                        {
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                    ]
                },
                {
                    "content": "enormous importance in the cycling of contaminants in the lake. For Be the",
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                    ]
                },
                {
                    "content": "picture is different as can be seen in Table 2. The trap fluxes of the isotopes",
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                    ]
                },
                {
                    "content": "is about half the atmospheric flux in surface waters and comparable to the",
                    "polygon": [
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                            "offset": 40402,
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                    ]
                },
                {
                    "content": "atmospheric flux in the near-bottom traps. Fluxes are expected to be lower than",
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                    "spans": [
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                            "offset": 40477,
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                    ]
                },
                {
                    "content": "atmospheric fluxes because of the scavenging efficiency and radioactive decay",
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                    "spans": [
                        {
                            "offset": 40557,
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                    ]
                },
                {
                    "content": "effects for beryllium.",
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                    "spans": [
                        {
                            "offset": 40635,
                            "length": 22
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                    ]
                },
                {
                    "content": "Application of a box model to 137Cs fluxes during the",
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                        {
                            "offset": 40658,
                            "length": 53
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                    ]
                },
                {
                    "content": "isothermal period suggest that the isotope is resuspended out of a mixed layer",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 40712,
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                    ]
                },
                {
                    "content": "approximately 40 mg/cm- in thickness. This layer thickness is also implied by",
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                        {
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                    ]
                },
                {
                    "content": "fluxes of 'Be during the isothermal period.",
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                    "spans": [
                        {
                            "offset": 40869,
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                    ]
                },
                {
                    "content": "The activity of Be in surface trap materials is shown in Figure 5. Large un-",
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                            "offset": 40913,
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                    ]
                },
                {
                    "content": "certainties accompany the values because of the very small amount of material",
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                },
                {
                    "content": "collected during stratification. In a model system with an abrupt onset of",
                    "polygon": [
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                        {
                            "offset": 41068,
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                    ]
                },
                {
                    "content": "stratification of fixed depth and constant residence time, the activity of Be",
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                    ]
                },
                {
                    "content": "should build up in epilimnetic trap materials throughout June and then fall off",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41221,
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                        }
                    ]
                },
                {
                    "content": "slightly in the remaining months prior to fall overturn. The actual results",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41301,
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                        }
                    ]
                },
                {
                    "content": "show a drastic early reduction in activity which begins in July-August. While",
                    "polygon": [
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                        {
                            "offset": 41377,
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                        }
                    ]
                },
                {
                    "content": "the reasons remain to be determined, most likely it is due to enhanced scavenging",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41455,
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                        }
                    ]
                },
                {
                    "content": "of the radionuclide by plankton and by authigenic calcite.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41537,
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                    ]
                },
                {
                    "content": "In bottom traps which",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41596,
                            "length": 21
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                    ]
                },
                {
                    "content": "collect predominantly resuspended materials throughout the whole season, the",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 41618,
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                },
                {
                    "content": "activity of Be decreases expoentially after stratification sets in (Figure 6).",
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                },
                {
                    "content": "In contrast, the activity of\"> Cs increases slightly (about 15%) over the same",
                    "polygon": [
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                },
                {
                    "content": "period. The exponential decrease suggests that when the lake is stratified, new",
                    "polygon": [
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                    ]
                },
                {
                    "content": "inputs of Be to the pool of resuspendable sediments is sharply curtailed.",
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                    "spans": [
                        {
                            "offset": 41933,
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                    ]
                },
                {
                    "content": "Furthermore, if there were no additions of the isotope during this period and",
                    "polygon": [
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                },
                {
                    "content": "no losses from the pool to unresuspendable sediments, then the activity in the",
                    "polygon": [
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                },
                {
                    "content": "pool should decrease with a half-life equal to the half-life of the isotope it-",
                    "polygon": [
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                        {
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                    ]
                },
                {
                    "content": "self. Within experimental error this is in fact the case. As seen in Figure 6,",
                    "polygon": [
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                            "offset": 42244,
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                },
                {
                    "content": "the activity in the trap material decreases with an apparent half-life of 54\u00b16",
                    "polygon": [
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                        {
                            "offset": 42323,
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                    ]
                },
                {
                    "content": "days. Much further work will be done to determine the geochemical characteristics",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 42402,
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                    ]
                },
                {
                    "content": "of 7Be, its particle affinities, and the extent to which its behavior may be",
                    "polygon": [
                        0.9944,
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                    "spans": [
                        {
                            "offset": 42484,
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                        }
                    ]
                },
                {
                    "content": "indicative of the behavior of contaminants in the water column and the benthic",
                    "polygon": [
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                        {
                            "offset": 42561,
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                    ]
                },
                {
                    "content": "nepheloid layer in particular.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 42640,
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                    ]
                },
                {
                    "content": "6.",
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                    "spans": [
                        {
                            "offset": 42671,
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                    ]
                },
                {
                    "content": "Papers presented:",
                    "polygon": [
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                    "spans": [
                        {
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                    ]
                },
                {
                    "content": "Robbins, J. A.",
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                            "offset": 42692,
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                    ]
                },
                {
                    "content": "Bioturbation and lake recovery times. Invited paper, 30th Annual",
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                    "spans": [
                        {
                            "offset": 42707,
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                        }
                    ]
                },
                {
                    "content": "Meeting of the North American Benthological Society, Ann Arbor, Michigan,",
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                    ]
                },
                {
                    "content": "May 18-21, 1982.",
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                    ]
                },
                {
                    "content": "Abstracts, p. 7.",
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                    ]
                },
                {
                    "content": "26",
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            ],
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                }
            ]
        },
        {
            "pageNumber": 32,
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            "words": [
                {
                    "content": "Robbins,",
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                    "confidence": 0.993,
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                },
                {
                    "content": "J.",
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                {
                    "content": "A.",
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                {
                    "content": "and",
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                    "content": "B.",
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                {
                    "content": "J.",
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                    "content": "Other talks:",
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                    "content": "Robbins, J. A., K. A. Johansen. Beryllium-7:",
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                    "content": "mixing processes in the Great Lakes.",
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                    "content": "Oswego, N. Y., May 24-26, 1983. (Accepted).",
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                    "content": "Chlorinated hydrocarbon concentrations and fluxes in sediment cores from",
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                    "content": "Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted).",
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                    "content": "28",
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                    "content": "Keilty, T. and J. A. Robbins. Are tubificid abundances in Lake Erie sediments",
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                    "content": "controlled by the rate of supply of organic carbon?",
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                    "content": "water Interaction, Ed. P. G. Sly. Proc. of the 2nd International Symposium",
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                {
                    "content": "on Sediment-Water Interactions, Kingston, Ont. Hydrobiologia 92 (1982)",
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                    "content": "611-622.",
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                    "content": "(dpm/cm2)",
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                    "content": "Lake-wide loading",
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                    "content": "10",
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                    "content": "In sediment cores",
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                    "content": "30",
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                    "content": "33",
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                    "content": "\u20aa2.3",
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                    "content": "In sediment cores",
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                    "content": "*Approximately the standing crop - flux/1. 2 = 0.693/53.4 days",
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                    "content": "(Lake",
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                    "content": "1982",
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                    "content": "0",
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                    "content": "\u00b7",
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                    "content": "J",
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                    "content": "Fig.6.",
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                {
                    "content": "11/2 = 54 \u00b1 6 days",
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                    "content": "ACTIVITY (dpm/g)",
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                    "content": "LAKE MICHIGAN",
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                    "content": "STATION 7, 1982",
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                    "content": "( 0 80m , \u00b7 95 m)",
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                    "content": "A M",
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                    "content": "PROGRESS REPORT",
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                {
                    "content": "APRIL, 1983",
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                {
                    "content": "1.",
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                },
                {
                    "content": "Organization:",
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                {
                    "content": "Great Lakes Environmental Research Laboratory",
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                {
                    "content": "NOAA",
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                },
                {
                    "content": "2300 Washtenaw Avenue",
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                {
                    "content": "Ann Arbor, MI 48104",
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                {
                    "content": "2.",
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                {
                    "content": "Principal Investigator: Michael J. McCormick",
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                    "content": "3.",
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                },
                {
                    "content": "Title:",
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                {
                    "content": "Vertical Dynamics of Toxic Organics in the Great Lakes",
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                    "content": "4.",
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                {
                    "content": "Project Summary: The objectives of this project are twofold:",
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                {
                    "content": "(1)",
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                {
                    "content": "to",
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                {
                    "content": "quantitatively described the decomposition pathways of persistent contaminants,",
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                },
                {
                    "content": "and (2) to improve such models by identifying and then minimizing the major",
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                },
                {
                    "content": "sources of prediction errors. A one-dimensional model has been completed and",
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                {
                    "content": "used to investigate the Mirex problem in Lake Ontario. Current efforts are",
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                {
                    "content": "focused on error analyses and on improving the predictability of submodels",
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                    "content": "detailing vertical mixing and photodecomposition.",
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                    "content": "5.",
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                {
                    "content": "Status: Over the past six months progress has been made on process parame-",
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                {
                    "content": "terizations and error analyses. In particular, a global radiation model (Atwater",
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                    "content": "and Brown, 1974) using cloud information from coastal meteorological stations on",
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                {
                    "content": "Lake Michigan has been programmed and is currently being compared against",
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                    "content": "measured solar radiation data from Madison, Wisconsin. This model will be used",
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                    "content": "to improve estimates of both photodecomposition losses and the intensity of",
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                    "content": "vertical mixing. Both processes are strongly dependent upon knowing the",
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                    "content": "irradiance which, in general, must be modeled due to the sparse radiation",
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                    "content": "gathering network in the Great Lakes region.",
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                    "content": "Error analyses have been performed on two models to examine transport uncertainty",
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                    "content": "on prediction estimates. A preliminary error analysis dealt with leakage of",
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                    "content": "Mirex from the sediments of Lake Ontario into the water column and its vertical",
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                    "content": "transport therein. The results suggest gross uncertainty in particle associated",
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                    "content": "concentrations of Mirex in surface waters, during winter, and suggests that",
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                    "content": "vertical eddy diffusion is a major error source.",
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                    "content": "The other model dealt with",
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                    "content": "uncertainty in nutrient regeneration rates in Lake Michigan. In this case",
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                {
                    "content": "horizontal advection was a major error source. Comparison of vertically to",
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                    "content": "horizontally associated errors indicates an error dominance due to horizontal",
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                    "content": "variability. Therefore, guidelines are being developed to provide minimum",
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                    "content": "estimates of error bounds for different applications of horizontal averaged",
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                {
                    "content": "one-dimensional models.",
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                    "content": "Error analyses have motivated additional work on vertical mixing. Comparisons",
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                    "content": "have been made between two eddy diffusion models of McCormick and Scavia (1981)",
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                    "content": "and Henderson-Sellers (1980). The results indicate similarities under three",
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                    "content": "conditions: (1) constant current shear, (2) high Richardson number, and",
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                    "content": "(3) low wind speed. Differences occur in treatment of low diffusion situations",
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                    "content": "which may significantly affect rate loss estimates in the toxic's model.",
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                    "spans": [
                        {
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                            "length": 42
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                    ]
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                {
                    "content": "Numerical Computations of the",
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                            "length": 29
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                    ]
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                {
                    "content": "Latitudial Variations of Solar Radiation for an Atmosphere of Varying Opacity.",
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                    "spans": [
                        {
                            "offset": 51331,
                            "length": 78
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                    ]
                },
                {
                    "content": "J. Appl. Met.",
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                        3.112,
                        2.4383,
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                        1.3004,
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                        {
                            "offset": 51410,
                            "length": 13
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                    ]
                },
                {
                    "content": "13:(2), 289-297.",
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                    "spans": [
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                            "offset": 51424,
                            "length": 16
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                    ]
                },
                {
                    "content": "Henderson-Sellers, B.",
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                {
                    "content": "(1980)",
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                        {
                            "offset": 51463,
                            "length": 6
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                    ]
                },
                {
                    "content": "Limnological Modelling:",
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                            "offset": 51470,
                            "length": 23
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                    ]
                },
                {
                    "content": "Simulation of Vertical",
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                        {
                            "offset": 51494,
                            "length": 22
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                    ]
                },
                {
                    "content": "Profiles to Temperature, Dissolved Oxygen and Nutrients.",
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                        1.3052,
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                    "spans": [
                        {
                            "offset": 51517,
                            "length": 56
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                    ]
                },
                {
                    "content": "I. Theory. J.",
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                    "spans": [
                        {
                            "offset": 51574,
                            "length": 13
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                    ]
                },
                {
                    "content": "Limnol. Soc. Sth. Afr., 6, 49-54.",
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                        {
                            "offset": 51588,
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                    ]
                },
                {
                    "content": "McCormick, M. J. and D. Scavia (1981)",
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                        {
                            "offset": 51622,
                            "length": 37
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                    ]
                },
                {
                    "content": "Calculation of Vertical Profiles of",
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                        4.3937,
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                    "spans": [
                        {
                            "offset": 51660,
                            "length": 35
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                    ]
                },
                {
                    "content": "Lake-Averaged Temperature and Diffusivity in Lakes Ontario and Washington.",
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                            "offset": 51696,
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                    ]
                },
                {
                    "content": "Water. Resour. Res.",
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                            "offset": 51771,
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                    ]
                },
                {
                    "content": "17: (2), 305-310.",
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                {
                    "content": "Pollard, R. T., P. B. Rhines and R. O. R. Y. Thompson (1973)",
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                {
                    "content": "The Deepening of",
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                    ]
                },
                {
                    "content": "the Wind-Mixed Layer. J. Geophys. Fluid Dyn., 3, 381-404.",
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                },
                {
                    "content": "7.",
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                {
                    "content": "Products:",
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                            "offset": 51948,
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                    ]
                },
                {
                    "content": "Henderson-Sellers, B., M. J. McCormick and D. Scavia (1983)",
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                    ]
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                {
                    "content": "A Comparison of",
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                        7.4678,
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                        {
                            "offset": 52018,
                            "length": 15
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                    ]
                },
                {
                    "content": "the Formulation for Eddy Diffusion in Two One-Dimensional Stratification",
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                            "offset": 52034,
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                {
                    "content": "Models.",
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                {
                    "content": "Appl. Math. Mod.",
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                },
                {
                    "content": "(In Press)",
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                },
                {
                    "content": "Henderson-Sellers, B. and M. J. McCormick (1983)",
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                },
                {
                    "content": "Vertical Eddy Diffusion",
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                    ]
                },
                {
                    "content": "Formulations in One-Dimensional Thermal Stratification Models for Lakes and",
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                            "offset": 52216,
                            "length": 75
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                {
                    "content": "Reservoirs.",
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                            "offset": 52292,
                            "length": 11
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                    ]
                },
                {
                    "content": "To be presented at Fourth Inter.",
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                    "spans": [
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                            "offset": 52304,
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                    ]
                },
                {
                    "content": "Conf. on Math. Mod., Zurich,",
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                            "offset": 52337,
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                    ]
                },
                {
                    "content": "Switzerland, 15 August.",
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                {
                    "content": "McCormick, M. J. and S. J. Tarapchak (1983)",
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                {
                    "content": "Error Analysis of Nutrient",
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                {
                    "content": "Regeneration Rates for a Station in Southern Lake Michigan. To be presented",
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                },
                {
                    "content": "at 26 Conf. International Assoc. for Great Lakes Res., 25 May.",
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                    ]
                },
                {
                    "content": "38",
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                    "content": "PROGRESS",
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                    "content": "REPORT",
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                    "content": "April",
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                    "confidence": 0.985,
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                {
                    "content": "1983",
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                {
                    "content": "1.",
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                },
                {
                    "content": "Organization:",
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                },
                {
                    "content": "Great",
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                    "confidence": 0.996,
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                {
                    "content": "Lakes",
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                    "content": "Environmental",
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                    "content": "Research",
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                    "content": "Ann",
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                    "content": "dissolved",
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                {
                    "content": "substances.",
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                {
                    "content": "(In",
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                {
                    "content": "press)",
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                    "content": "NOAA",
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                {
                    "content": "Technical",
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                {
                    "content": "Memorandum.",
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                {
                    "content": "39",
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            "lines": [
                {
                    "content": "PROGRESS REPORT",
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                {
                    "content": "April 1983",
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                {
                    "content": "1.",
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                {
                    "content": "Organization:",
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                {
                    "content": "Great Lakes Environmental Research Laboratory",
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                {
                    "content": "NOAA",
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                {
                    "content": "2300 Washtenaw Avenue",
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                {
                    "content": "Ann Arbor, MI 48104",
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                {
                    "content": "2.",
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                {
                    "content": "Principal Investigator:",
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                {
                    "content": "John R. Bennett and Anne H. Clites",
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                {
                    "content": "3.",
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                    "content": "Title:",
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                },
                {
                    "content": "Modeling the Transport of Toxic Substances",
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                {
                    "content": "4.",
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                {
                    "content": "Project Summary: The objective of this project is to develop methods to",
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                },
                {
                    "content": "predict the temporal and spatial movement of toxics in the Great Lakes.",
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                },
                {
                    "content": "A",
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                            "length": 1
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                    ]
                },
                {
                    "content": "two-dimensional, vertically integrated model and a three-dimensional, thermally",
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                    ]
                },
                {
                    "content": "stratified model will be used to calculate currents in Lake Michigan.",
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                {
                    "content": "These",
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                            "offset": 53154,
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                    ]
                },
                {
                    "content": "currents will then drive a water quality model that will advect, diffuse,",
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                    ]
                },
                {
                    "content": "settle, and resuspend particles and dissolved substances.",
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                },
                {
                    "content": "5.",
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                },
                {
                    "content": "Status: In order to predict the motion and fate of toxics in the Great Lakes,",
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                },
                {
                    "content": "the currents must first be known. The model wind stress and current fields",
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                    ]
                },
                {
                    "content": "will be generated by a circulation model developed by Schwab, Bennett, and",
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                    ]
                },
                {
                    "content": "Jessup (1981) for other GLERL studies.",
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                    ]
                },
                {
                    "content": "Our goal in this project is to use these currents to simulate the movement of",
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                    ]
                },
                {
                    "content": "dissolved and particulate-bound materials in any of the Great Lakes. Toward",
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                },
                {
                    "content": "that end we have developed a general computer program which calculates advective",
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                    ]
                },
                {
                    "content": "motion, settling, and resuspension. This program, documented in Bennett, Clites,",
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                    ]
                },
                {
                    "content": "and Schwab (1983), uses the grid generation programs developed by Schwab and",
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                    ]
                },
                {
                    "content": "Sellers (1980) and is designed to use the currents simulated by the previously",
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                    ]
                },
                {
                    "content": "mentioned circulation model.",
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                    ]
                },
                {
                    "content": "The model has been tested for pure advection using an idealized lake.",
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                },
                {
                    "content": "Its",
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                    ]
                },
                {
                    "content": "numerical accuracy has been found to be more than adequate for our purposes. We",
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                },
                {
                    "content": "are continuing to test the effects of settling and resuspension in idealized",
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                        {
                            "offset": 54217,
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                    ]
                },
                {
                    "content": "cases. Eventually, we intend to verify the model by comparison with data from",
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                        {
                            "offset": 54294,
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                    ]
                },
                {
                    "content": "sediment traps currently moored in Lake Michigan. Radionuclides will be used as",
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                {
                    "content": "particle tracers to infer suspended sediment transport paths. When verification",
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                },
                {
                    "content": "of this vertically integrated model is complete, we will begin testing a three-",
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                    ]
                },
                {
                    "content": "dimensional version.",
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                },
                {
                    "content": "6.",
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                    ]
                },
                {
                    "content": "References:",
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                    ]
                },
                {
                    "content": "Bennett, J. R., A. H. Clites, and D. J. Schwab 1983. A two-dimensional lake",
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                    ]
                },
                {
                    "content": "circulation modeling system:",
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                    "content": "13 pp.",
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                        3.9499,
                        2.008
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                    ]
                },
                {
                    "content": "The University of Michigan",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Ann Arbor, Michigan 48109",
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                {
                    "content": "2. Principal Investigators:",
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                    ]
                },
                {
                    "content": "Clifford P. Rice and",
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                    ]
                },
                {
                    "content": "Philip A. Meyers",
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                            "offset": 55767,
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                    ]
                },
                {
                    "content": "3.",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Amount of 1983 Funds: 60 K",
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                            "offset": 55787,
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                    ]
                },
                {
                    "content": "4.",
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                            "offset": 55814,
                            "length": 2
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                    ]
                },
                {
                    "content": "Total Project Funds to Date: 60 K",
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                            "offset": 55817,
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                    ]
                },
                {
                    "content": "5.",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Title: Partitioning and Cycling of Toxic Organics in",
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                },
                {
                    "content": "the Great Lakes Ecosystem",
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                    ]
                },
                {
                    "content": "6. Project Summary: The objective of this project is to",
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                            "offset": 55933,
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                },
                {
                    "content": "study the role particle suspension plays in the continued",
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                            "offset": 55989,
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                    ]
                },
                {
                    "content": "recycling of toxic organic compounds in the Great Lake",
                    "polygon": [
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                    ]
                },
                {
                    "content": "system. Emphasis will be placed on analyses of the",
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                    "spans": [
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                    ]
                },
                {
                    "content": "suspended and settling particulate portions of the samples.",
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                    ]
                },
                {
                    "content": "Both selected toxic organics, e.g. pesticides (dieldrin,",
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                },
                {
                    "content": "DDT, etc.), PCBs, phthalates, and chlorobenzenes, and non-",
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                },
                {
                    "content": "selective GC-MS scans will be performed. Analyses of lipid",
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                    ]
                },
                {
                    "content": "biomarkers of samples will be performed in order to follow",
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                {
                    "content": "biogeochemical cycling at the sediment/water and",
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                },
                {
                    "content": "epilimnion/hypolimnion interfaces and in other turbidity",
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                },
                {
                    "content": "zones, such as river plumes and coastal locations.",
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                    "content": "7. Status: Our major effort for the chlororganic studies",
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                },
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                    "content": "has been to develop methods to identify and quantitate the",
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                    ]
                },
                {
                    "content": "individual isomers which constitute the PCBs in the Lake",
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                },
                {
                    "content": "Michigan samples. A method for packed column analysis has",
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                {
                    "content": "been devised which allows partial homologue",
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                },
                {
                    "content": "characterizations to be made. This provides data which can",
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                {
                    "content": "be used to estimate weathering of the PCB mixtures. For",
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                },
                {
                    "content": "exact identification of the isomers in the PCBs we are",
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                {
                    "content": "using capillary separation techniques. Because of the",
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                    "content": "large amount of data generated for each analysis (i.e. 50",
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                {
                    "content": "to 60 separate chromatographic peaks) computer processing",
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                    "content": "is being used. Multiple regression statistics is used to",
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                {
                    "content": "sort the data in reconstructing best matches to Aroclor",
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                    "content": "types. For identification of the isomers, peak tables are",
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                    "content": "constructed from exact isomer standards.",
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                    "content": "A preliminary scan of a Lake Michigan particulate",
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                    "content": "sample on the Mass Spectrometer has identified some unusual",
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                    "content": "isopropyl substituted benzene",
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                {
                    "content": "compounds,",
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                    "content": "are",
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                    "content": "continuing on these samples.",
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                {
                    "content": "1983.",
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                    "content": "Meyers,",
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                {
                    "content": "P.A.,",
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                {
                    "content": "M.J.",
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                {
                    "content": "Leenheer,",
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                {
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                {
                    "content": "B.",
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                    "content": "Eadie.",
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                    "content": "1983.",
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                {
                    "content": "matter",
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                    "content": "alterations",
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                    "content": "sediment",
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                {
                    "content": "42",
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            "lines": [
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                    ]
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                {
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                },
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                    "content": "to Great",
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                    "content": "Lakes",
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                    "content": "is being obtained by study of",
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                    "content": "sediments of lakes are influenced",
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                    "content": "processes which accompany the sinking of particles through",
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                },
                {
                    "content": "the water column (Meyers, et al. 1980). Organic matter",
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                    "content": "the initial material available. we have examined elemental",
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                {
                    "content": "Michigan and in sections of dated sediment cores",
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                    "content": "depths. Surficial sediments from",
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                    "content": "all",
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                    "content": "locations contain",
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                    "content": "a strong",
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                    "content": "origin. this contrast reflects a combination of",
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                    "content": "resuspension of surficial sediment particles on the basis of",
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                    "content": "differences",
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                    "content": "microbial",
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                    "content": "degradation",
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                    "content": "and",
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                    "content": "resynthesis of hydrocarbons within",
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                    "content": "the",
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                    "content": "lake",
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                    "content": "bottoms.",
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                    "content": "Organic matter associated with sinking particles undergoes",
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                {
                    "content": "substantial degradation and alteration prior to deposition.",
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                    "content": "Aquatic material is preferentially",
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                    "content": "lost relative to land",
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                {
                    "content": "derived substances, and resuspension of bottom sediments",
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                {
                    "content": "provides",
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                {
                    "content": "renewed opportunities for further alteration.",
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                    "content": "Progressive changes in hydrocarbon character",
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                    "content": "in the cores",
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                {
                    "content": "suggests microbial activity continues deep into these lake",
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                    "content": "sediments. The processes which modify and degrade natural",
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                {
                    "content": "organic compounds are likely to affect synthetic material as",
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                    "content": "well.",
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                },
                {
                    "content": "This study is improving our understanding of these",
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                    "content": "processes.",
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                    ]
                },
                {
                    "content": "References",
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                        6.9267,
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                    "spans": [
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                            "offset": 59614,
                            "length": 10
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                    ]
                },
                {
                    "content": "Meyers, P.A., S.J. Edwards, and B.J. Eadie.",
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                        1.4055,
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                        {
                            "offset": 59625,
                            "length": 43
                        }
                    ]
                },
                {
                    "content": "1980.",
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                },
                {
                    "content": "Fatty",
                    "polygon": [
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                {
                    "content": "acid and",
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                },
                {
                    "content": "hydrocarbon content of settling sediments",
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                    "spans": [
                        {
                            "offset": 59690,
                            "length": 41
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                    ]
                },
                {
                    "content": "in Lake Michigan. J. Great Lakes Res. , 6: 331-337.",
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                    ]
                },
                {
                    "content": "8. Products:",
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                            "offset": 59784,
                            "length": 12
                        }
                    ]
                },
                {
                    "content": "Meyers, P.A., M.J. Leenheer, B.J. Eadie, and S.J. Maule.",
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                },
                {
                    "content": "\"Organic geochemistry",
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                    ]
                },
                {
                    "content": "of",
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                },
                {
                    "content": "suspended and settling",
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                {
                    "content": "particulates in",
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                },
                {
                    "content": "Lake Michigan.\"",
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                },
                {
                    "content": "Submitted",
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                },
                {
                    "content": "to",
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                },
                {
                    "content": "Geochemica et Cosmochimica Acta, 3 January 1983.",
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                {
                    "content": "Meyers, P.A., M.J. Leenheer, and B. J. Eadie. 1983. \"Organic",
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                {
                    "content": "matter",
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                            "length": 6
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                    "content": "alterations",
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                            "length": 11
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                    "content": "during sinking of",
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                {
                    "content": "sediment",
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                {
                    "content": "42",
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            "pageNumber": 48,
            "angle": 0.04973587021231651,
            "width": 8.5139,
            "height": 11.0417,
            "unit": "inch",
            "words": [
                {
                    "content": "particles",
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                {
                    "content": "44",
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                {
                    "content": "Organization:",
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                    "content": "The University of Michigan",
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                {
                    "content": "2200 Bonisteel Blvd.",
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                    "content": "Ann Arbor, MI",
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                    "content": "48109",
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                {
                    "content": "Principal Investigators: Ronald Rossmann and Kjell A. Johansen",
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                {
                    "content": "Amount of 1983 Funds:",
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                    "content": "$47,125.",
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                    "content": "4.",
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                },
                {
                    "content": "$93,231.",
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                {
                    "content": "5.",
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                {
                    "content": "Title:",
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                },
                {
                    "content": "Determination of Present and Historical Fluxes in High Sedimen-",
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                },
                {
                    "content": "tation Rate Areas of the Great Lakes.",
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                },
                {
                    "content": "6.",
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                    "content": "Project Summary: The sedimentary environment of deposition is being",
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                {
                    "content": "described in detail. This includes measurement of sedimentation rates,",
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                    ]
                },
                {
                    "content": "depth of surficial sediment mixing, dilution of contaminants by non-",
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                            "offset": 60968,
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                    ]
                },
                {
                    "content": "contaminated sediments, the depth of sediment oxygenation, and the flux of",
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                },
                {
                    "content": "metal contaminants to the sediment. From these data, the post-depositional",
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                    ]
                },
                {
                    "content": "redistribution (diagenesis, physical mixing) of contaminants is described.",
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                },
                {
                    "content": "7.",
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                {
                    "content": "Status:",
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                    ]
                },
                {
                    "content": "Since its inception, undisturbed Lakes Michigan, Erie, and Ontario",
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                {
                    "content": "cores have been collected or obtained through co-operation with other",
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                },
                {
                    "content": "investigators. Analysis of the Lakes Michigan and Ontario cores is",
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                },
                {
                    "content": "complete. That of the Lake Erie cores has begun and is expected to be",
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                {
                    "content": "completed by December 1983. A comprehensive report detailing the results",
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                },
                {
                    "content": "of work on the Lakes Ontario and Michigan cores will be completed by",
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                },
                {
                    "content": "June 1, 1983.",
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                    ]
                },
                {
                    "content": "During the past six months, analysis of four cores from Lake Ontario and",
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                    ]
                },
                {
                    "content": "three cores from Lake Michigan for metals has been completed. The metals",
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                    ]
                },
                {
                    "content": "include arsenic, barium, bismuth, calcium, cadmium, chromium, copper, iron,",
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                    ]
                },
                {
                    "content": "mercury, magnesium, manganese, nickel, lead, antimony, vanadium, and zinc.",
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                    "content": "The depth to which surficial sediments are homogenized by physical mixing",
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                    "content": "has been determined for each of the cores. For all practical purposes,",
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                    "content": "this depth also represents the depth of oxygen penetration. Metals proving",
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                },
                {
                    "content": "useful for measuring the mixed depth include manganese, copper, lead,",
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                },
                {
                    "content": "cadmium, antimony, arsenic, mercury, and nickel. Of these, manganese",
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                    "confidence": 0.996,
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                    }
                },
                {
                    "content": "events.",
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                    "confidence": 0.993,
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                    }
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                {
                    "content": "Indeed,",
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                {
                    "content": "the",
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                {
                    "content": "disturbance",
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                {
                    "content": "in",
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                    "content": "the",
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                    "content": "cores",
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                    "content": "occurred",
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                {
                    "content": "in",
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                },
                {
                    "content": "the",
                    "polygon": [
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                    "confidence": 0.999,
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                },
                {
                    "content": "Lake",
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                    "confidence": 0.989,
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                    }
                },
                {
                    "content": "Michigan",
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                },
                {
                    "content": "cores",
                    "polygon": [
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                    "confidence": 0.997,
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                    }
                },
                {
                    "content": "during",
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                    "confidence": 0.995,
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                    }
                },
                {
                    "content": "the",
                    "polygon": [
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                    "confidence": 0.995,
                    "span": {
                        "offset": 65967,
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                    }
                },
                {
                    "content": "well-documented",
                    "polygon": [
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                    "confidence": 0.991,
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                    }
                },
                {
                    "content": "1954",
                    "polygon": [
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                    "confidence": 0.991,
                    "span": {
                        "offset": 65987,
                        "length": 4
                    }
                },
                {
                    "content": "seiche.",
                    "polygon": [
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                    "confidence": 0.995,
                    "span": {
                        "offset": 65992,
                        "length": 7
                    }
                },
                {
                    "content": "45",
                    "polygon": [
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                    ],
                    "confidence": 0.999,
                    "span": {
                        "offset": 66000,
                        "length": 2
                    }
                }
            ],
            "lines": [
                {
                    "content": "Elements exhibiting diagenetic mobility in the Lake Ontario cores include",
                    "polygon": [
                        1.4589,
                        0.8877,
                        7.592,
                        0.8925,
                        7.592,
                        1.0365,
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                    ],
                    "spans": [
                        {
                            "offset": 63095,
                            "length": 73
                        }
                    ]
                },
                {
                    "content": "arsenic, calcium, and manganese.",
                    "polygon": [
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                        4.2231,
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                    ],
                    "spans": [
                        {
                            "offset": 63169,
                            "length": 32
                        }
                    ]
                },
                {
                    "content": "In the Lake Michigan cores, those",
                    "polygon": [
                        4.3095,
                        1.0605,
                        7.0881,
                        1.0605,
                        7.0881,
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                    "spans": [
                        {
                            "offset": 63202,
                            "length": 33
                        }
                    ]
                },
                {
                    "content": "exhibiting this mobility include arsenic and manganese.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 63236,
                            "length": 55
                        }
                    ]
                },
                {
                    "content": "During the past six months, measurements and profile interpretations for",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 63292,
                            "length": 72
                        }
                    ]
                },
                {
                    "content": "cesium-137 and lead-210 have occurred. For each core, lead-210 and",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 63365,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "cesium-137 are measured, sedimentation rates are derived from the lead-210",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 63432,
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                        }
                    ]
                },
                {
                    "content": "and cesium-137 profiles, and dates are assigned to each core interval.",
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                    "spans": [
                        {
                            "offset": 63507,
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                        }
                    ]
                },
                {
                    "content": "Radiometric measurements are complete for nine cores from Lakes Ontario and",
                    "polygon": [
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                    "spans": [
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                            "offset": 63578,
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                        }
                    ]
                },
                {
                    "content": "Michigan. For the Lake Erie cores, cesium-137 measurements are still to be",
                    "polygon": [
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                        }
                    ]
                },
                {
                    "content": "completed on one core, and lead-210 measurements are thirty percent",
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                    "spans": [
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                    ]
                },
                {
                    "content": "completed.",
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                    "spans": [
                        {
                            "offset": 63797,
                            "length": 10
                        }
                    ]
                },
                {
                    "content": "Based on a steady-state mixing model being applied to Lake Erie cesium-137",
                    "polygon": [
                        1.4493,
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                    ],
                    "spans": [
                        {
                            "offset": 63808,
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                        }
                    ]
                },
                {
                    "content": "results, some of the highest sedimentation rates in the Great Lakes have",
                    "polygon": [
                        1.4493,
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                    "spans": [
                        {
                            "offset": 63883,
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                        }
                    ]
                },
                {
                    "content": "been found, ranging from 0.079 g/cm2/yr (1.11 cm/yr) in the central basin",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 63956,
                            "length": 73
                        }
                    ]
                },
                {
                    "content": "to 0.95 g/ cm2/yr (2.78 cm/yr) in the eastern basin. The depth of physical",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "homogenation of surficial sediments ranges from 5.2 to 13.6 cm. For one",
                    "polygon": [
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                    ],
                    "spans": [
                        {
                            "offset": 64105,
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                        }
                    ]
                },
                {
                    "content": "Lake St. Clair core, the sedimentation rate is 0.15 g/cm2/yr (0.32 cm/yr)",
                    "polygon": [
                        1.4397,
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                    "spans": [
                        {
                            "offset": 64177,
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                        }
                    ]
                },
                {
                    "content": "with physical homogenation to a depth of 7.5 cm, giving a dating resolution",
                    "polygon": [
                        1.4397,
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                    "spans": [
                        {
                            "offset": 64251,
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                        }
                    ]
                },
                {
                    "content": "of 37 years.",
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                        }
                    ]
                },
                {
                    "content": "Based on lead-210, the average sedimentation rates within the top ten centi-",
                    "polygon": [
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                        4.5969,
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                    ],
                    "spans": [
                        {
                            "offset": 64340,
                            "length": 76
                        }
                    ]
                },
                {
                    "content": "meters of cores from two Lake Ontario locations ranged from 0.039 g/ cm2/yr",
                    "polygon": [
                        1.4301,
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                    "spans": [
                        {
                            "offset": 64417,
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                        }
                    ]
                },
                {
                    "content": "(0.19/cm/yr) to 0.076 g/cm2/yr (0.30 cm/yr).",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 64493,
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                        }
                    ]
                },
                {
                    "content": "Because all three Lake Michigan cores have perturbated lead-210 profiles,",
                    "polygon": [
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                            "offset": 64538,
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                    ]
                },
                {
                    "content": "special techniques had to be used to obtain sedimentation rates and core",
                    "polygon": [
                        1.4397,
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                    "spans": [
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                            "offset": 64612,
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                    ]
                },
                {
                    "content": "interval dates. Perturbations of the normal exponential lead-210 profile",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 64685,
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                        }
                    ]
                },
                {
                    "content": "occurred at the same depths as disturbances in the stable lead, copper, and",
                    "polygon": [
                        1.4397,
                        5.7773,
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                        5.7773,
                        7.7599,
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                    ],
                    "spans": [
                        {
                            "offset": 64758,
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                        }
                    ]
                },
                {
                    "content": "arsenic profiles. The disturbances in these stable metal profiles are",
                    "polygon": [
                        1.4445,
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                        7.3376,
                        5.9452,
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                    "spans": [
                        {
                            "offset": 64834,
                            "length": 69
                        }
                    ]
                },
                {
                    "content": "attributed to and correlate with severe storm events. By averaging",
                    "polygon": [
                        1.4445,
                        6.1132,
                        7.0785,
                        6.1228,
                        7.0785,
                        6.2667,
                        1.4445,
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                    ],
                    "spans": [
                        {
                            "offset": 64904,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "segments of the lead-210 profile which appeared undisturbed and had a",
                    "polygon": [
                        1.4493,
                        6.2811,
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                        6.2811,
                        7.2512,
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                    ],
                    "spans": [
                        {
                            "offset": 64971,
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                        }
                    ]
                },
                {
                    "content": "similar slope, characteristic sedimentation rates of 0.080, 0.054, and",
                    "polygon": [
                        1.4397,
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                        7.328,
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                    ],
                    "spans": [
                        {
                            "offset": 65041,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "0.021 g/ cm2/yr were calculated for the three Lake Michigan cores. The",
                    "polygon": [
                        1.4445,
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                        7.328,
                        6.6122,
                        7.328,
                        6.7754,
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                    ],
                    "spans": [
                        {
                            "offset": 65112,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "resulting dates for intervals in each core confirm the coincidence of major",
                    "polygon": [
                        1.4397,
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                        7.7503,
                        6.7946,
                        7.7503,
                        6.9433,
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                    ],
                    "spans": [
                        {
                            "offset": 65183,
                            "length": 75
                        }
                    ]
                },
                {
                    "content": "sediment disturbances and major storm events for the years or year",
                    "polygon": [
                        1.4541,
                        6.9625,
                        7.0017,
                        6.9673,
                        7.0017,
                        7.1065,
                        1.4541,
                        7.1017
                    ],
                    "spans": [
                        {
                            "offset": 65259,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "groupings of 1835, 1845, 1860, and 1869; 1905; 1913; 1916, 1918, and 1919;",
                    "polygon": [
                        1.4301,
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                        7.6496,
                        7.1209,
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                    "spans": [
                        {
                            "offset": 65326,
                            "length": 74
                        }
                    ]
                },
                {
                    "content": "1940; 1954; and 1958. Re-examination of the Lake Ontario cores also",
                    "polygon": [
                        1.4493,
                        7.2936,
                        7.1601,
                        7.2936,
                        7.1601,
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                        1.4493,
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                    ],
                    "spans": [
                        {
                            "offset": 65401,
                            "length": 67
                        }
                    ]
                },
                {
                    "content": "confirms the coincidence of major sediment disturbances and major storm",
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                    ],
                    "spans": [
                        {
                            "offset": 65469,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "events for the years or year groupings of 1780; 1811; 1835, 1845, and 1860;",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
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                    "content": "Cyclotella",
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                {
                    "content": "vs.",
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                    "content": "Lake",
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                },
                {
                    "content": "Michigan",
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                    "span": {
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                },
                {
                    "content": "47",
                    "polygon": [
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            "lines": [
                {
                    "content": "PROGRESS REPORT",
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                {
                    "content": "March 1983",
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                    "content": "1.",
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                    "content": "Principal Investigator:",
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                },
                {
                    "content": "Mila S. Simmons",
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                {
                    "content": "2.",
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                {
                    "content": "Affiliation:",
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                },
                {
                    "content": "Department of Environmental & Industrial Health",
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                },
                {
                    "content": "The University of Michigan",
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                {
                    "content": "3.",
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                {
                    "content": "Amount of 1982 Sponsored Funds:",
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                    "content": "$43,200",
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                },
                {
                    "content": ".",
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                {
                    "content": "4.",
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                    "content": "Total Project Funds through 1982:",
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                    ]
                },
                {
                    "content": "$126,800",
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                },
                {
                    "content": "5.",
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                },
                {
                    "content": "Title:",
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                },
                {
                    "content": "Photochemical Degradation & Transformation Studies of Toxic Organics",
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                },
                {
                    "content": "in the Great Lakes",
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                {
                    "content": "6.",
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                    "content": "Project Summary: The overall objective of this research project is to conduct",
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                },
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                    "content": "studies on the photochemical degradation of toxic organics. Kinetic rate constants",
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                {
                    "content": "of the photolytic process for PCBs and PAHs under natural and artificial sunlight",
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                {
                    "content": "will be incorporated in a model which will describe the cycling, transport and",
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                    "content": "fate of toxic organics in the Great Lakes.",
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                {
                    "content": "7.",
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                    "content": "Status:",
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                {
                    "content": "Photolysis rate experiments in both natural and artificial sunlight",
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                    "content": "have been conducted and decomposition rates and quantum yields for individual",
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                    "content": "chlorobiphenyl isomers have been calculated.",
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                    "content": "Current work in progress includes the effects of microlayer, humic acids and CaCO",
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                    "content": "particulates on the photolytic degradation of PAH in aquatic systems.",
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                    "content": "Lake",
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                    "content": "Michigan microlayer and water samples were taken on (5/20/81, 6/5/81, 6/24/81, and",
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                    "content": "8/3-5/81) at depths 1 and 10 meters. Characterization of the microlayer by GC/MS",
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                    "content": "(with capillary column) revealed the presence of the high molecular weight long-",
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                    "content": "were irradiated with a 5 Mrad dose of gamma rays. The radiation exposure was",
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                    "content": "composition rate of naphthalene in the presence of Cyclotella vs. Lake Michigan",
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                    "content": "doctoral",
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                    "content": "research.",
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                {
                    "content": "49",
                    "polygon": [
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            "lines": [
                {
                    "content": "PROGRESS REPORT",
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                {
                    "content": "APRIL, 1983",
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                {
                    "content": "1.",
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                    ]
                },
                {
                    "content": "Organization:",
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                    ]
                },
                {
                    "content": "Great Lakes Environmental Research Laboratory",
                    "polygon": [
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                    ]
                },
                {
                    "content": "NOAA",
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                    "spans": [
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                            "offset": 70267,
                            "length": 4
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                    ]
                },
                {
                    "content": "2300 Washtenaw Ave.",
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                    ]
                },
                {
                    "content": "Ann Arbor, MI 48104",
                    "polygon": [
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                },
                {
                    "content": "2. Principal Investigator:",
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                },
                {
                    "content": "David S. White",
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                },
                {
                    "content": "Great Lakes Research Division",
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                    ]
                },
                {
                    "content": "University of Michigan",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Ann Arbor, MI 48109",
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                {
                    "content": "3. Amount of 1983 Funds:",
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                    ]
                },
                {
                    "content": "$19.8 K",
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                },
                {
                    "content": "4.",
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                {
                    "content": "Total Amount of Projects Funds to Date:",
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                {
                    "content": "$19.8 K",
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                    "content": "5.",
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                },
                {
                    "content": "Title:",
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                    "content": "Redistribution of Sediment-Bound Toxic Organics by Benthic",
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                    "content": "Invertebrates",
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                },
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                    "content": "movement of toxic organics through fine-grained sediments as mediated by",
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                    "content": "aquatic oligochaete feeding. This involves the determination of both",
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                    "content": "mixing and burial rates which will be of primary importance in models of",
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                    "content": "long-term lake recovery. Secondary in the experiments is the determination",
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                    "content": "of the effects of the toxicants (in this case PCBs) on the mixing and",
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                    "content": "burial processes themselves. These primarily are laboratory studies",
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                    "content": "using microcosms and radiotracers and the two dominant Great Lakes' aquatic",
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                    "content": "oligochaete species Stylodrilus heringianus (an \"oligotrophic\" indicator)",
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                    "content": "and Limnodrilus hoffmeisteri (a \"eutrophic\" indicator) .",
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                    "content": "7. Status: To this point, two major activities have occurred.",
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                    "content": "The first",
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                    "content": "has been an evaluation of two preliminary experiments using",
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                    "content": "14c labeled",
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                    "content": "PCBs with Stylodrilus and Limnodrilus in the microcosms. We have shown",
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                    "content": "that the two species have differing but predictable responses to a range",
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                    "content": "of a specific PCB isomer and that their actions in redistribution of the",
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                    "content": "PCBs can be monitored. That is, we have separated the movements of 137Cs",
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                    "content": "labeled sediments from the final distribution of the 14C labeled isomer.",
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                    "content": "Further, we have determined the range of isomer concentration that seems",
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                    "content": "to stress the more oligotrophic Stylodrilus. We do not yet know this",
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                    "content": "range for Limnodrilus.",
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                {
                    "content": "Secondly, the above results have allowed us to produce a design for",
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                    "content": "a series of more closely controlled experiments on the redistribution,",
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                    "content": "net accumulation and uptake kinetics of PCBs by these two dominant",
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                    "content": "aquatic oligochaetes. At this point we have redesigned and are rebuilding",
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                    "content": "the microcosms for two sets of experiments to begin around the first of",
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                    "content": "April when fresh collections of oligochaetes will be available from Lake",
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                    "content": "Michigan.",
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                    "content": "9.",
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                    "content": "Products: Two products have come from the research thus far. The first",
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                    "content": "is a manuscript on the PCB-Stylodrilus preliminary experiment which will",
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                    "content": "be submitted for review and possible publication this spring. The second",
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                    "content": "is a dissertation proposal by T. Keilty who will use much of the data",
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                    "content": "generated here for his doctoral research.",
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                    "content": "49",
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                    "content": "April,",
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                    "content": "1983",
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                    "content": "1.",
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                    "content": "Organization:",
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                    "content": "Great",
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                    "content": "NOAA",
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                    "content": "Ann",
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                    "content": "Arbor,",
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                    "content": "P.",
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                {
                    "content": "3.",
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                    "content": "Amount",
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                {
                    "content": "of",
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                    "content": "Funds:",
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                    "content": "$17,484",
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                    "content": "4.",
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                    "content": "to",
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                    "content": "Date:",
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                {
                    "content": "Title:",
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                {
                    "content": "Changes",
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                {
                    "content": "Principal Investigator: John P. Giesy",
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                {
                    "content": "3.",
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                    "content": "Amount of 1983 Funds: $17,484",
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                    "content": "4.",
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                    "content": "Total Projects Funds to Date: $17,484",
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                    "content": "5.",
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                {
                    "content": "Title:",
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                {
                    "content": "Changes in the Free Amino Acid Pool of Benthic Invertebrates as a",
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                    "content": "Sublethal Toxic Response to Pentachlorophenol",
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                    "content": "6.",
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                    "content": "Project Summary:",
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                    "content": "The objective of this project is to develop non-specific biochemical",
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                    "content": "measures of chemically induced sublethal, chronic stress in benthic organisms",
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                    "content": "from the Great Lakes. Initially we will be examining the response of the free",
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                    "content": "amino acid pools and glycogen concentrations of the amphipod Gammarus",
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                    "content": "fasciatus and the annelid, Stylodrilus heringianus. We are examining the seasonal",
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                    "content": "and spatial variability of the FAA in samples of these species from the Great",
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                    "content": "Lakes as well as changes due to exposure to pentachlorophenol in laboratory",
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                    "content": "of stress in these organisms would be more appropriate. To that end we have",
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                    "content": "Our initial efforts have been to design our test protocols for the entire",
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                    "content": "Principal Investigator:",
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                    "content": "Minneapolis, MN 55455",
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                    "content": "$73,000",
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                    "content": "Toxic Organic-Sediment Dynamics in the Great Lakes",
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                    "content": "sediment cores obtained with an oceanographic box corer and benthos corer from",
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                    "content": "high and low sedimentation regions of each of the Great Lakes will be carefully",
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                    "content": "examined for stratigraphic variations in concentration and transformed species",
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                    "content": "optional model date the estimated time of introduction.",
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                    "content": "following as it may be important for understanding in-lake processes:",
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                    "content": "some",
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                    "content": "explanations worth considering include: predominance of other more distributed",
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                    "content": "sources, delay in appearance of signal at the offshore location, processes of",
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                    "content": "40",
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                    "content": "60",
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                    "content": "1980",
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                    "content": "-",
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                {
                    "content": "1970",
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                {
                    "content": "CUMULATIVE DRY WEIGHT (g/cm2)",
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                {
                    "content": "1960",
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                },
                {
                    "content": "2",
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                    "content": "1950",
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                {
                    "content": "YEAR (A.D.)",
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                    ]
                },
                {
                    "content": "TOTAL PCBs",
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                },
                {
                    "content": "TOTAL MIREX",
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                    ]
                },
                {
                    "content": "1940",
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                            "length": 4
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                },
                {
                    "content": "3",
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                            "length": 1
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                    ]
                },
                {
                    "content": "1930",
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                            "length": 4
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                },
                {
                    "content": "4",
                    "polygon": [
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                    "spans": [
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                            "length": 1
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                },
                {
                    "content": "1920",
                    "polygon": [
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                },
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                    "content": "Figure 1.",
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                    "content": "Distribution of mirex and total PCBs in the Lake Ontario cores.",
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                    "content": "The dashed line in each case is the distribution predicted from total sales",
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                    "content": "figures for the compounds.",
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                    "content": "The solid curve for mirex is the distribution",
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                    "content": "expected for a pulse entering the lake around 1970. As the PCBs show",
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                    "content": "sediment degradation rates or mobility which depend on isomeric composition,",
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                    "content": "any relation between sediment profiles and production figures must be",
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                    "content": "considered fortuitous.",
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                    "content": "Distribution of PCBs will ultimately be treated in",
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                    "content": "terms of specific isomers.",
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                        1.0183,
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                    "confidence": 0.992,
                    "span": {
                        "offset": 82576,
                        "length": 2
                    }
                },
                {
                    "content": "Products",
                    "polygon": [
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                        2.02,
                        7.542,
                        2.0157,
                        7.6948,
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                    "confidence": 0.994,
                    "span": {
                        "offset": 82579,
                        "length": 8
                    }
                },
                {
                    "content": ":",
                    "polygon": [
                        2.056,
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                        2.1083,
                        7.5431,
                        2.1083,
                        7.6938,
                        2.0517,
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                    "confidence": 0.984,
                    "span": {
                        "offset": 82588,
                        "length": 1
                    }
                },
                {
                    "content": "56",
                    "polygon": [
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                        4.3468,
                        10.1965,
                        4.3487,
                        10.3182,
                        4.1831,
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                    "confidence": 0.996,
                    "span": {
                        "offset": 82590,
                        "length": 2
                    }
                }
            ],
            "lines": [
                {
                    "content": "PROGRESS REPORT",
                    "polygon": [
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                        1.0134,
                        4.9289,
                        1.0182,
                        4.9289,
                        1.1425,
                        3.6668,
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                    "spans": [
                        {
                            "offset": 80942,
                            "length": 15
                        }
                    ]
                },
                {
                    "content": "April 1983",
                    "polygon": [
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                        4.7233,
                        1.1855,
                        4.7233,
                        1.3146,
                        3.8771,
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                    ],
                    "spans": [
                        {
                            "offset": 80958,
                            "length": 10
                        }
                    ]
                },
                {
                    "content": "1.",
                    "polygon": [
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                        1.2238,
                        1.6588,
                        1.2191,
                        1.807,
                        1.0374,
                        1.807
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                    "spans": [
                        {
                            "offset": 80969,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Organization:",
                    "polygon": [
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                        2.4955,
                        1.6636,
                        2.4907,
                        1.8213,
                        1.3195,
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                    ],
                    "spans": [
                        {
                            "offset": 80972,
                            "length": 13
                        }
                    ]
                },
                {
                    "content": "Radiological and Environmental Research Division",
                    "polygon": [
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                        6.6403,
                        1.6922,
                        6.6403,
                        1.8309,
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                    ],
                    "spans": [
                        {
                            "offset": 80986,
                            "length": 48
                        }
                    ]
                },
                {
                    "content": "Argonne National Laboratory",
                    "polygon": [
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                        1.85,
                        4.9671,
                        1.8643,
                        4.9671,
                        2.003,
                        2.7011,
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                    ],
                    "spans": [
                        {
                            "offset": 81035,
                            "length": 27
                        }
                    ]
                },
                {
                    "content": "Argonne, Illinois",
                    "polygon": [
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                        2.0173,
                        4.1974,
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                        2.7106,
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                    "spans": [
                        {
                            "offset": 81063,
                            "length": 17
                        }
                    ]
                },
                {
                    "content": "60439",
                    "polygon": [
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                        2.0269,
                        4.7089,
                        2.0269,
                        4.7089,
                        2.1559,
                        4.2739,
                        2.1559
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                    "spans": [
                        {
                            "offset": 81081,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "2.",
                    "polygon": [
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                        2.3376,
                        1.1952,
                        2.3424,
                        1.1952,
                        2.4571,
                        1.047,
                        2.4571
                    ],
                    "spans": [
                        {
                            "offset": 81087,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Principle Investigator:",
                    "polygon": [
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                        3.2891,
                        2.3519,
                        3.2843,
                        2.4953,
                        1.3768,
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                    ],
                    "spans": [
                        {
                            "offset": 81090,
                            "length": 23
                        }
                    ]
                },
                {
                    "content": "Donald M. Nelson",
                    "polygon": [
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                        2.3567,
                        4.795,
                        2.3615,
                        4.795,
                        2.4906,
                        3.4469,
                        2.4858
                    ],
                    "spans": [
                        {
                            "offset": 81114,
                            "length": 16
                        }
                    ]
                },
                {
                    "content": "3.",
                    "polygon": [
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                        2.6531,
                        1.2047,
                        2.6579,
                        1.1952,
                        2.8204,
                        1.0278,
                        2.8156
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                    "spans": [
                        {
                            "offset": 81131,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Amount of 1983 Funds:",
                    "polygon": [
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                        3.1122,
                        2.6865,
                        3.1122,
                        2.8156,
                        1.3481,
                        2.8013
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                    "spans": [
                        {
                            "offset": 81134,
                            "length": 21
                        }
                    ]
                },
                {
                    "content": "$20 K",
                    "polygon": [
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                        2.6961,
                        3.7146,
                        2.6913,
                        3.7146,
                        2.8156,
                        3.2843,
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                    ],
                    "spans": [
                        {
                            "offset": 81156,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "4.",
                    "polygon": [
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                        3.0116,
                        1.1999,
                        3.0212,
                        1.1952,
                        3.1359,
                        1.0422,
                        3.1263
                    ],
                    "spans": [
                        {
                            "offset": 81162,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Total Project Funds to Date:",
                    "polygon": [
                        1.3673,
                        3.0164,
                        3.7002,
                        3.0307,
                        3.7002,
                        3.1646,
                        1.3673,
                        3.155
                    ],
                    "spans": [
                        {
                            "offset": 81165,
                            "length": 28
                        }
                    ]
                },
                {
                    "content": "$20 K",
                    "polygon": [
                        3.8675,
                        3.0403,
                        4.3026,
                        3.0403,
                        4.3026,
                        3.1598,
                        3.8675,
                        3.1646
                    ],
                    "spans": [
                        {
                            "offset": 81194,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "5.",
                    "polygon": [
                        1.0278,
                        3.3271,
                        1.2095,
                        3.3319,
                        1.2047,
                        3.4896,
                        1.0183,
                        3.4896
                    ],
                    "spans": [
                        {
                            "offset": 81200,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Title:",
                    "polygon": [
                        1.3529,
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                        1.874,
                        3.3319,
                        1.8692,
                        3.4992,
                        1.3529,
                        3.4896
                    ],
                    "spans": [
                        {
                            "offset": 81203,
                            "length": 6
                        }
                    ]
                },
                {
                    "content": "Removal of Radionuclides from Watersheds of the Great Lakes",
                    "polygon": [
                        2.0366,
                        3.3558,
                        6.9606,
                        3.3845,
                        6.9606,
                        3.5183,
                        2.0366,
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                    ],
                    "spans": [
                        {
                            "offset": 81210,
                            "length": 59
                        }
                    ]
                },
                {
                    "content": "6.",
                    "polygon": [
                        1.0374,
                        3.6809,
                        1.1952,
                        3.6809,
                        1.1952,
                        3.8051,
                        1.0374,
                        3.8051
                    ],
                    "spans": [
                        {
                            "offset": 81270,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Project Summary: The objective of this research is to measure the",
                    "polygon": [
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                        6.8746,
                        3.7095,
                        6.8746,
                        3.8482,
                        1.3673,
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                    ],
                    "spans": [
                        {
                            "offset": 81273,
                            "length": 65
                        }
                    ]
                },
                {
                    "content": "transport of the fallout radionuclides 90Sr,",
                    "polygon": [
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                        3.8577,
                        5.1057,
                        3.8625,
                        5.1057,
                        4.0011,
                        1.3577,
                        3.9964
                    ],
                    "spans": [
                        {
                            "offset": 81339,
                            "length": 44
                        }
                    ]
                },
                {
                    "content": "137Cs, and 239Pu into the",
                    "polygon": [
                        5.1249,
                        3.8577,
                        7.2092,
                        3.8721,
                        7.2044,
                        4.0155,
                        5.1249,
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                    ],
                    "spans": [
                        {
                            "offset": 81384,
                            "length": 25
                        }
                    ]
                },
                {
                    "content": "Great Lakes via rivers. This information is needed as input to models",
                    "polygon": [
                        1.3673,
                        4.0155,
                        7.1997,
                        4.0585,
                        7.1997,
                        4.1971,
                        1.3673,
                        4.1541
                    ],
                    "spans": [
                        {
                            "offset": 81410,
                            "length": 69
                        }
                    ]
                },
                {
                    "content": "describing the cycling of these elements within the lakes.",
                    "polygon": [
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                        4.2067,
                        6.1814,
                        4.3453,
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                    ],
                    "spans": [
                        {
                            "offset": 81480,
                            "length": 58
                        }
                    ]
                },
                {
                    "content": "7.",
                    "polygon": [
                        1.0374,
                        4.5126,
                        1.1856,
                        4.5174,
                        1.1856,
                        4.6465,
                        1.0326,
                        4.6417
                    ],
                    "spans": [
                        {
                            "offset": 81539,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Status :",
                    "polygon": [
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                        4.5222,
                        1.9601,
                        4.5318,
                        1.9601,
                        4.6513,
                        1.3673,
                        4.6417
                    ],
                    "spans": [
                        {
                            "offset": 81542,
                            "length": 8
                        }
                    ]
                },
                {
                    "content": "Four rivers draining into Lake Michigan have been chosen for",
                    "polygon": [
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                        7.1136,
                        4.5557,
                        7.1136,
                        4.6943,
                        1.9888,
                        4.6704
                    ],
                    "spans": [
                        {
                            "offset": 81551,
                            "length": 60
                        }
                    ]
                },
                {
                    "content": "study:",
                    "polygon": [
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                        1.8645,
                        4.6943,
                        1.8645,
                        4.8329,
                        1.3529,
                        4.8329
                    ],
                    "spans": [
                        {
                            "offset": 81612,
                            "length": 6
                        }
                    ]
                },
                {
                    "content": "Manistee, Menomonee, Grand, and St. Joseph. These are to be",
                    "polygon": [
                        2.0127,
                        4.6943,
                        7.0371,
                        4.7278,
                        7.0371,
                        4.8616,
                        2.0127,
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                    ],
                    "spans": [
                        {
                            "offset": 81619,
                            "length": 59
                        }
                    ]
                },
                {
                    "content": "sampled four times during the year. The first two samplings were",
                    "polygon": [
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                        4.8616,
                        6.7933,
                        4.8951,
                        6.7885,
                        5.0385,
                        1.3529,
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                    ],
                    "spans": [
                        {
                            "offset": 81679,
                            "length": 64
                        }
                    ]
                },
                {
                    "content": "completed in early November and early February. Sample analyses from",
                    "polygon": [
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                        7.1232,
                        5.0624,
                        7.1232,
                        5.2106,
                        1.3577,
                        5.1771
                    ],
                    "spans": [
                        {
                            "offset": 81744,
                            "length": 68
                        }
                    ]
                },
                {
                    "content": "November are nearly complete and these results are presented in Table 1.",
                    "polygon": [
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                        7.367,
                        5.2297,
                        7.3622,
                        5.3683,
                        1.3481,
                        5.3444
                    ],
                    "spans": [
                        {
                            "offset": 81813,
                            "length": 72
                        }
                    ]
                },
                {
                    "content": "Also presented for comparison are typical values for Lake Michigan. In",
                    "polygon": [
                        1.3529,
                        5.3683,
                        7.3096,
                        5.397,
                        7.3096,
                        5.5452,
                        1.3529,
                        5.5117
                    ],
                    "spans": [
                        {
                            "offset": 81886,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "each instance the river concentrations are comparable to, or lower than,",
                    "polygon": [
                        1.3577,
                        5.5261,
                        7.3479,
                        5.5691,
                        7.3479,
                        5.7125,
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                        5.6743
                    ],
                    "spans": [
                        {
                            "offset": 81957,
                            "length": 72
                        }
                    ]
                },
                {
                    "content": "corresponding lake concentrations. The highest concentrations are, in",
                    "polygon": [
                        1.3481,
                        5.7029,
                        7.2044,
                        5.7268,
                        7.2044,
                        5.8894,
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                    ],
                    "spans": [
                        {
                            "offset": 82030,
                            "length": 69
                        }
                    ]
                },
                {
                    "content": "general, associated with the Menomonee River and probably reflect the",
                    "polygon": [
                        1.3481,
                        5.8703,
                        7.128,
                        5.8989,
                        7.128,
                        6.0471,
                        1.3481,
                        6.0137
                    ],
                    "spans": [
                        {
                            "offset": 82100,
                            "length": 69
                        }
                    ]
                },
                {
                    "content": "paucity of exchangeable cations in its watershed as well as the elevated",
                    "polygon": [
                        1.3434,
                        6.0376,
                        7.367,
                        6.071,
                        7.367,
                        6.2192,
                        1.3434,
                        6.1905
                    ],
                    "spans": [
                        {
                            "offset": 82170,
                            "length": 72
                        }
                    ]
                },
                {
                    "content": "concentrations of dissolved organic carbon (and hence natural complexing",
                    "polygon": [
                        1.3529,
                        6.2144,
                        7.3718,
                        6.2383,
                        7.3718,
                        6.3913,
                        1.3529,
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                    ],
                    "spans": [
                        {
                            "offset": 82243,
                            "length": 72
                        }
                    ]
                },
                {
                    "content": "ligands) in the water. These initial findings are consistent with our",
                    "polygon": [
                        1.3529,
                        6.3722,
                        7.1997,
                        6.4056,
                        7.1997,
                        6.5491,
                        1.3529,
                        6.5204
                    ],
                    "spans": [
                        {
                            "offset": 82316,
                            "length": 69
                        }
                    ]
                },
                {
                    "content": "supposition that rivers are not major sources of these radionuclides to",
                    "polygon": [
                        1.3529,
                        6.5538,
                        7.2809,
                        6.5777,
                        7.2809,
                        6.7164,
                        1.3529,
                        6.6925
                    ],
                    "spans": [
                        {
                            "offset": 82386,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "the Great Lakes. No obstacles are foreseen which would interfere with the",
                    "polygon": [
                        1.3577,
                        6.7116,
                        7.5295,
                        6.7498,
                        7.5295,
                        6.8837,
                        1.3577,
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                    ],
                    "spans": [
                        {
                            "offset": 82458,
                            "length": 73
                        }
                    ]
                },
                {
                    "content": "completion of this project.",
                    "polygon": [
                        1.3577,
                        6.8885,
                        3.5903,
                        6.8932,
                        3.5903,
                        7.0462,
                        1.3577,
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                    ],
                    "spans": [
                        {
                            "offset": 82532,
                            "length": 27
                        }
                    ]
                },
                {
                    "content": "8.",
                    "polygon": [
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                        7.1896,
                        1.1999,
                        7.1944,
                        1.1999,
                        7.3569,
                        1.0039,
                        7.3522
                    ],
                    "spans": [
                        {
                            "offset": 82560,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "References :",
                    "polygon": [
                        1.329,
                        7.1944,
                        2.266,
                        7.1992,
                        2.266,
                        7.3617,
                        1.329,
                        7.3569
                    ],
                    "spans": [
                        {
                            "offset": 82563,
                            "length": 12
                        }
                    ]
                },
                {
                    "content": "9.",
                    "polygon": [
                        1.0231,
                        7.5481,
                        1.1808,
                        7.5529,
                        1.176,
                        7.6724,
                        1.0183,
                        7.6677
                    ],
                    "spans": [
                        {
                            "offset": 82576,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Products :",
                    "polygon": [
                        1.3338,
                        7.5338,
                        2.1035,
                        7.5338,
                        2.1035,
                        7.6916,
                        1.3338,
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                    ],
                    "spans": [
                        {
                            "offset": 82579,
                            "length": 10
                        }
                    ]
                },
                {
                    "content": "56",
                    "polygon": [
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                        4.3456,
                        10.1965,
                        4.3408,
                        10.316,
                        4.1831,
                        10.3207
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                    "spans": [
                        {
                            "offset": 82590,
                            "length": 2
                        }
                    ]
                }
            ],
            "spans": [
                {
                    "offset": 80942,
                    "length": 1650
                }
            ]
        },
        {
            "pageNumber": 62,
            "angle": 0,
            "width": 11.0417,
            "height": 8.5139,
            "unit": "inch",
            "words": [
                {
                    "content": "\u0647",
                    "polygon": [
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                        0.5142,
                        1.8,
                        0.5171,
                        1.7958,
                        0.5648,
                        1.7624,
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                    "confidence": 0.453,
                    "span": {
                        "offset": 82593,
                        "length": 1
                    }
                },
                {
                    "content": "3",
                    "polygon": [
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                        0.6708,
                        8.6263,
                        0.6708,
                        8.6233,
                        0.7425,
                        8.5754,
                        0.7405
                    ],
                    "confidence": 0.93,
                    "span": {
                        "offset": 82595,
                        "length": 1
                    }
                },
                {
                    "content": "Table",
                    "polygon": [
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                        1.6226,
                        5.6294,
                        1.6245,
                        5.6272,
                        1.7481,
                        5.2113,
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                    ],
                    "confidence": 0.981,
                    "span": {
                        "offset": 82597,
                        "length": 5
                    }
                },
                {
                    "content": "1",
                    "polygon": [
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                        1.6241,
                        5.8036,
                        1.6239,
                        5.8036,
                        1.7474,
                        5.7414,
                        1.7476
                    ],
                    "confidence": 0.847,
                    "span": {
                        "offset": 82603,
                        "length": 1
                    }
                },
                {
                    "content": "239Pu",
                    "polygon": [
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                        7.0352,
                        2.2726,
                        7.0336,
                        2.41,
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                    "confidence": 0.899,
                    "span": {
                        "offset": 82605,
                        "length": 5
                    }
                },
                {
                    "content": "137Cs",
                    "polygon": [
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                        2.2461,
                        8.54,
                        2.2726,
                        8.5371,
                        2.41,
                        8.1371,
                        2.3802
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                    "confidence": 0.908,
                    "span": {
                        "offset": 82611,
                        "length": 5
                    }
                },
                {
                    "content": "90gr",
                    "polygon": [
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                        2.2375,
                        10.0736,
                        2.252,
                        10.0706,
                        2.4147,
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                    ],
                    "confidence": 0.843,
                    "span": {
                        "offset": 82617,
                        "length": 4
                    }
                },
                {
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                    "content": "Chemistry,",
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                },
                {
                    "content": "Wisconsin;",
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                    "content": "Mr.",
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                    "content": "Lee",
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                    "content": "Liebenstein",
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                {
                    "content": "Mr.",
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                {
                    "content": "Jim",
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                {
                    "content": "St.",
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                },
                {
                    "content": "Amant,",
                    "polygon": [
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                },
                {
                    "content": "Wisconsin",
                    "polygon": [
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                    "confidence": 0.994,
                    "span": {
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                },
                {
                    "content": "58",
                    "polygon": [
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                        10.2825,
                        4.4032,
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                    "confidence": 0.998,
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            ],
            "lines": [
                {
                    "content": "PROGRESS REPORT",
                    "polygon": [
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                        0.5975,
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                },
                {
                    "content": "APRIL, 1983",
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                        4.7522,
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                    "spans": [
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                    ]
                },
                {
                    "content": "A",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "=",
                    "polygon": [
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                    "spans": [
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                            "length": 1
                        }
                    ]
                },
                {
                    "content": "1.",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Organization:",
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                    ]
                },
                {
                    "content": "Oak Ridge National Laboratory",
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                    ]
                },
                {
                    "content": "P.O. Box X",
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                        3.6765,
                        1.6014,
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                    ]
                },
                {
                    "content": "Oak Ridge, TN 37830",
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                    ]
                },
                {
                    "content": "2.",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "Principal Investigator: James E. Breck",
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                    ]
                },
                {
                    "content": "3.",
                    "polygon": [
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                    "spans": [
                        {
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                    ]
                },
                {
                    "content": "Amount of 1983 Funds: $40 K",
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                },
                {
                    "content": "4.",
                    "polygon": [
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                },
                {
                    "content": "Total Project Funds to Date:",
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                        3.9203,
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                    ]
                },
                {
                    "content": "$40 K",
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                    ]
                },
                {
                    "content": "5.",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Title: Models for the Behavior and Fate of Long-lived Contaminants in the",
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                    "spans": [
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                            "offset": 83300,
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                    ]
                },
                {
                    "content": "Upper Trophic Levels of the Great Lakes",
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                    "spans": [
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                            "length": 39
                        }
                    ]
                },
                {
                    "content": "6.",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Project Summary: The objective of this project is to develop and analyze",
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                    "spans": [
                        {
                            "offset": 83417,
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                    ]
                },
                {
                    "content": "models for simulating contaminant concentrations in Great Lakes fishes;",
                    "polygon": [
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                    ]
                },
                {
                    "content": "this will include an evaluation of the relative contributions of direct",
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                            "offset": 83562,
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                    ]
                },
                {
                    "content": "uptake from water, pelagic food chain pathways, and benthic food chain",
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                    "spans": [
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                            "offset": 83634,
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                    ]
                },
                {
                    "content": "pathways. Initial work has focused on simulating the accumulation of",
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                            "offset": 83705,
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                    ]
                },
                {
                    "content": "PCBs by alewives, the dominant forage fish in Lake Michigan, using a",
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                },
                {
                    "content": "bioenergetics modeling approach.",
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                },
                {
                    "content": "7.",
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                },
                {
                    "content": "Status: Progress has been made in several areas of this project since it",
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                    ]
                },
                {
                    "content": "was initiated approximately six months ago. First, a bioenergetics model",
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                },
                {
                    "content": "in FORTRAN was modified to permit simulation of PCB accumulation by alewives",
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                },
                {
                    "content": "from water and from multiple prey types (Mysis, Pontoporeia, copepods,",
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                },
                {
                    "content": "and cladocerans), and preliminary simulation results were obtained. These",
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                },
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                    "content": "preliminary results are very encouraging, since the simulated PCB concen-",
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                },
                {
                    "content": "trations in the first few years of life are very close to the observed PCB",
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                {
                    "content": "concentrations in Lake Michigan alewives (approximately 1-5 ppm). These",
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                },
                {
                    "content": "initial results indicate that the trophic uptake pathway is more important",
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                {
                    "content": "for PCB uptake than direct uptake from the water; the food chain pathway",
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                    "content": "contributes more than 80% of the total PCBs accumulated by alewives. This",
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                },
                {
                    "content": "can be seen in the accompanying figure, which shows the relative contri-",
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                {
                    "content": "butions of water and several prey types to the PCBs accumulated by alewives",
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                    "content": "(the effects of spawning are incorporated, as discussed below). More than",
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                    "content": "half of the total PCBs in alewives is estimated to have come from the",
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                    "content": "benthic amphipod Pontoporeia, suggesting that the benthic food chain that",
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                    "content": "by Lake Michigan alewives, and consequently, by their salmonid predators.",
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                    "content": "Second, information on PCB concentrations in Lake Michigan alewives and",
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                    "content": "invertebrates is being compiled from several published and unpublished",
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                    "content": "provided a computer listing of the PCB data for Lake Michigan fishes that",
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                    "content": "the WDNR has collected from 1976 through 1982. An initial list of 61",
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                    "content": "of the Center for Limnology, University of Wisconsin-Madison) and with",
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                    "content": "Sullivan, State Hygiene Lab and Department of Water Chemistry, University",
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                    "content": "of Wisconsin; also Mr. Lee Liebenstein and Mr. Jim St. Amant, Wisconsin",
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                    "content": "are extremely low, approaching zero. The accompanying figure shows the",
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                    "content": "ratio values used were 0, 0.5, 1.0, and 1.5. When the ratio is less than",
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                    "content": "simulations which do not have spawning. As can be seen in the accom-",
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                    "content": "panying figure, consideration of spawning losses of contaminants is",
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                    "content": "especially important for estimating contaminant concentrations in older",
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                    "content": "species such as lake trout.",
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                    "content": "8.",
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                {
                    "content": "References :",
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                        1.5021,
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                        {
                            "offset": 88192,
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                    ]
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                {
                    "content": "Norden, C. R. (1967) Age, Growth and Fecundity of the Alewife, Alosa",
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                    "spans": [
                        {
                            "offset": 88205,
                            "length": 68
                        }
                    ]
                },
                {
                    "content": "pseudoharengus (Wilson), in Lake Michigan. Trans. Am. Fish. Soc.",
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                    "spans": [
                        {
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                        }
                    ]
                },
                {
                    "content": "96: 387-393.",
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                    ],
                    "spans": [
                        {
                            "offset": 88339,
                            "length": 12
                        }
                    ]
                },
                {
                    "content": "Niimi, A. J. Biological and Toxicological Effects of Environmental",
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                    "spans": [
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                            "offset": 88352,
                            "length": 66
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                    ]
                },
                {
                    "content": "Contaminants in Fish and their Eggs. Can. J. Fish. Aquat. Sci.",
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                },
                {
                    "content": "(in press).",
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                {
                    "content": "9.",
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                    "content": "Products: none yet.",
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                    "content": "59",
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            "content": "Individual Reports"
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            "content": "Long-term behavior of PAH"
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            "content": "9"
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            "content": "Role of benthic invertebrates . 12"
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            "content": "Radiotracer studies 23"
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            "content": "Vertical dynamics"
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            "content": "37"
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            "content": "Transport modeling"
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            "content": "Partitioning of toxic organics"
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            "content": "Hi sed fluxes"
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            "content": "44"
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            "content": "Photodegradation"
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            "content": "47"
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            "content": "Bioturbation"
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            "content": "Invertebrate stress 50"
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            "content": "Sediment-organic dynamcis 53"
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            "content": "Watershed inputs"
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            "content": "56"
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            "content": "Upper trophic level model"
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            "content": "58"
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            "content": "4"
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            "content": "Background"
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                    "length": 440
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            "content": "In 1978, the U. S. and Canada signed a Great Lakes Water Quality Agreement that required \"research programs in support of the Great Lakes International Surveillance Plan be established at a level sufficient to identify temporal and spacial trends in the concentration of persistent toxic substances such as PCB, mirex, DDT, mercury, and dieldrin, and of other substances known to be present in biota and sediment of the Great Lakes System\"."
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            "content": "In August, 1979, the Great Lakes Environmental Research Laboratory (GLERL) began a research program in cooperation with the Office of Marine Pollution Assessment (OMPA), whose goal is the development of a capability to predict the environmental consequence of persistent synthetic organic contaminants in the Great Lakes ecosystem. The understanding of long term OMPA funding has allowed GLERL to develop cooperative agreements with several research institutions and to pursue a comprehensive research program focused on a few questions regarding the flow of selected organics within the Great Lakes. The results generated in this program will be transferrable to coastal marine systems."
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            ],
            "content": "A predictive capability is synonymous with modeling, and to accomplish this a modeling team has been set up in-house consisting of chemical, toxi- cological, ecological, and physical scientists. The modeling group is sup- ported by researchers working on primary ecosystem processes. Most of the process research has been conducted at the University of Michigan, however, our program now has expanded to include several research groups, an arrange- ment which allows for a maximum of flexibility. In the four fiscal years"
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            "content": "1"
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            "content": "(FY 79-82) of this program, over 2/3 of OMPA funding has been spent on university research projects, primarily at Michigan. Because the program fits so well within its mission, GLERL has more than matched the in-house OMPA funds."
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            "content": "Introduction"
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            ],
            "content": "The leakage of toxic synthetic organic contaminants into aquatic eco- systems is a well recognized global problem. The conclusion of a recent workshop on the \"Scientific Basis for Dealing with Chemical Toxic Substances in the Great Lakes\", co-sponsored by the GLERL (Sonzogni and Swain, 1980), was that the Great Lakes are particularly susceptible because of high population density, concentration of heavy industry and slow (decade-century) flushing rates. Similar evaluations have been expressed by the Great Lakes Science Advisory Board (IJC, 1980a), Water Quality Board (IJC, 1980b) and Toxic Substances Committee (IJC, 1980c) of the International Joint Commission. Over 400 toxic contaminants have been identified to date within the Great Lakes ecosystem (IJC, 1980c) and the extent of the hazards for most of these are poorly understood."
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            "content": "While most of these contaminants are \"perceived\" to be detrimental to environmental quality, several toxic organics have been identified as the source of \"real\" problems. High concentrations of DDT in Great Lakes fish severely impacted the herring gull population of the basin in the late 60s and early 70s. This once common predator is now beginning to reestablish itself, although high levels of PCB and TCDD may slow their recovery. PCB level in Lake Michigan sportfish are significantly above the FDA recommended"
        },
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            "content": "2"
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            "content": "level of two parts per million. It has been estimated that this contami- nation is costing the state of Wisconsin over one million dollars per year (U. Wisc., 1980) with costs for the entire basin many times this amount. A report by the National Research Council (NRC, 1979) states that the Great Lakes are the largest reservoir of PCBs in the United States. Another identified problem is Mirex\u00ae in Lake Ontario (Kaiser, 1978; Pickett and Dossett, 1979). This compound, a fire ant pesticide manufactured in the basin, leaked into the lake and contaminated the fish to a level which resulted in a New York State ban on their commercial sale. Increased incidences of neoplasia (tumerous lesions) have been found in the fishes of the Great Lakes and tentatively atttributed to relatively high concentrations of polynuclear aromatic hydrocarbons (Sonstegard, 1977; Black et al, 1980; Eadie et al., 1982 a,b). High levels of dieldrin, toxaphenes, and dioxin have been measured indicating that other real problems are out there waiting to be found."
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            "content": "Attempts to model the fate of toxic organic compounds in aquatic eco- systems appear to provide a good first order estimate of their long term behavior (Baughman and Lassiter, 1978; Mackay, 1979; Eadie et al., 1981). These models are excellent tools for assembling existing information, testing system sensitivity and designing a coherent research program. In time, they will be useful tools in the decision-making process as well."
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            "content": "Since its creation in 1974, GLERL has specialized in the design and development of ecosystem models which simulate or predict the physical, chemical and biological responses of the Great Lakes to imposed stresses."
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            "content": "3"
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            "content": "In this program, our efforts to date have focused on the development of system models, supported by the specific process research required to improve, calibrate and/or validate our mathematical abstractions. Modeling-experi- mental interactions enable us to make stepwise improvements in our under- standing of the cycling, behavior and fate of synthetic contaminants. Such information is necessary to identify the contaminants which pose the greatest threat to the environment, which organisms or regions within the lakes are most affected, what can be expected in the years ahead and what can be done to reduce the level of ecosystem stress. Goals and Objectives"
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            "content": "The goal of this program is to produce a clearer understanding of the cycling of hydrophobic toxic organic compounds in the Great Lakes environ- ment. Our ultimate objective is to be able to predict locations, concen- trations, decay rates, residence times and eventual sinks of these materials under conditions of long term, low level leakage into the environment or a major loading from some point source. This information is critical for toxicologists, ecologists and resource managers to evalue the potential impacts of particular materials introduced into the Great Lakes region and to provide cost beneficial solutions to the problems in balancing the continued production and use of these compounds with the responsibility of protecting the Great Lakes as a resource. In the final analysis, environ- mental resource management comes down to a trade-off between \"acceptable risks\" and \"unacceptable costs\", and best judgments leading to a suitable balance can only be achieved if the information base is sound."
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            "content": "Approach"
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            "content": "Most persistent toxic organics behave similarly in the aquatic environment; they are only slightly soluble and partition onto particulate material, they tend to photodecompose and evaporate as major removal path- ways, they are generally resistant to microbial attack and they concentrate in the sediments. This similarity of behavior makes a modeling approach attractive and recently toxic cycling models have begun to appear in the literature. These models require compound-specific experimental rate process information tailored for the ecosystem to which it is applied."
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            "content": "We are employing a systems approach, in which a series of models will be developed. These include the calibration of available equilibrium (Fugacity) and steady state thermodynamic model (EXAMS; EPA) for the"
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            "content": "Great Lakes: the development of a one-dimensional, time-dependent, process model and the calibration of a two-dimensional time-dependent transport (modified oil spill) model containing first order decomposition, resuspension and sedimentation terms. Our models will be continuously upgraded through the results of our process research experiments, both in-house and under contract, along with other information entering the literature. Carrying our process research and modeling simultaneously will allow us to continually determine the weakest or most senstive areas in our systems approach and define research necessary to address these specific problems. Ultimately our goal is to combine calibrated ecosystem cycling models with system transport models."
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            "content": "We have concentrated on two classes of toxic organic substances, poly- nuclear aromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB)."
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            "content": "5"
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            "content": "Field and laboratory studies on the rates of volatilization, photode- composition, sorption onto particulates indigenous to the Great Lakes, biological decomposition, aggregation and settling were designed and implemented to support our toxic organic cycling model. During the past year we have expanded our program to include DDT and its decomposition products and several radionuclides including Cesium 137, Beryllium 7, and Cerium 144. There is a large data base on the distribution of these com- pounds as well as information on their loads to the lakes and decomposition pathways and rates. This wealth of information can be used in the cali- bration phase of our modeling program."
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            "content": "A conceptualization of our toxic organic system is shown in Figure 1. The 15 process arrows are being studied in our program as shown in the Project/Process Matrix (Table 1). The column marked M is to represent those directly involved in modeling."
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            "content": "Progress reports on these individual projects follow:"
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            "content": "Conceptualized Toxic System Model"
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            "content": "Atmosphere"
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            "content": "P"
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            "content": "Water Column"
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            "content": "Conceptualized toxic system model. P represents particle phase, D represents dissolved phase, and B is an abbrevi-"
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            "content": "ated food web. The 15 process arrows are:"
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            "content": "2. Sorption"
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            "content": "3. Air-water exchange"
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            "content": "4. Grazing and fecal pellet generation"
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            "content": "5. Filtering"
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            "content": "6. Photolysis"
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            "content": "7. Biological decomposition"
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            "content": "Settling and resuspension"
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            "content": "8. 9. Food web dynamics"
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            "content": "11. Biological decomposition"
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                }
            ],
            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104"
        },
        {
            "spans": [
                {
                    "offset": 12321,
                    "length": 45
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "2. Principal Investigator: Dr. Brian J. Eadie"
        },
        {
            "spans": [
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                    "offset": 12367,
                    "length": 129
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            ],
            "boundingRegions": [
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            ],
            "content": "3. Title: Long-term Behavior and Fate of Polycyclic Aromatic Hydrocarbons and Other Toxic Organic Contaminants in the Great Lakes"
        },
        {
            "spans": [
                {
                    "offset": 12497,
                    "length": 271
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            ],
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                }
            ],
            "content": "4. Project Summary: The objectives of this project are 1) to develop and calibrate long-term toxic cycling models for the Great Lakes and 2) to conduct experiments on processes which affect the transport of synthetic organic compounds across the sediment-water interface."
        },
        {
            "spans": [
                {
                    "offset": 12769,
                    "length": 746
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "5. Status: Part I. During the past few months, efforts have been made to design a toxic cycling model which includes the effect of sediment resuspension and re- equilibriation of sediments with the water column. Programming and testing are currently underway. This model will be calibrated with radionuclide data (Pb-210, Cs-137, Be-7) from our sediment trap program. This model is designed as a coupled Great Lakes model. It will take monthly time steps and non-steady state input. Once calibrated satisfactorily with radionuclide data, case studies of toxic organics will be run. One final product will be analysis of the Great Lakes' response to loads of compounds with solubility/decomposition values ranging over several orders of magnitude."
        },
        {
            "spans": [
                {
                    "offset": 13516,
                    "length": 356
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            ],
            "boundingRegions": [
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                    "pageNumber": 14,
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                }
            ],
            "content": "Part II. During the last winter, our sediment trap program continued with the deployment of 26 traps at five locations throughout Lake Michigan. These data will more than double our information base on the magnitude of re- suspension during the unstratified period. Analyses are scheduled for r adio- nuclides, nutrients, PAH, and chlorinated hydrocarbons."
        },
        {
            "spans": [
                {
                    "offset": 13873,
                    "length": 309
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            ],
            "boundingRegions": [
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                    "pageNumber": 14,
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                }
            ],
            "content": "A supplementary trap program has been conducted on a monthly basis throughout the past year. Cumulative mass flux and Be-7 data for this project are shown in Robbins' report in this issue. This project will be modified to collect samples further offshore (mid-lake) on a biweekly basis during the coming year."
        },
        {
            "spans": [
                {
                    "offset": 14183,
                    "length": 375
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                }
            ],
            "content": "Our analyses of PAH in the high sed cores from Lakes Ontario and Michigan are almost complete. The Lake Michigan core was complicated by several apparent slumping events, making conclusions difficult. PAH in the Ontario cores show several spikes in concentration and a buildup and eventual decay of perylene from diagenetic causes. These data will be analyzed in more detail."
        },
        {
            "spans": [
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                    "offset": 14559,
                    "length": 1
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                }
            ],
            "content": "9"
        },
        {
            "spans": [
                {
                    "offset": 14561,
                    "length": 255
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 15,
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                }
            ],
            "content": "Several reports on PAH in the Great Lakes have been published by our group. One major result has been the finding that major Great Lakes benthic organisms have the ability to mobilize sedimentary PAH and that they do serve as a major food source for fish."
        },
        {
            "spans": [
                {
                    "offset": 14817,
                    "length": 434
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "One other major project is underway. This one is to measure the formation and decomposition rates of complexes of natural organics and synthetic organics. Such complexes appear to be common in pore waters of the lakes and appear to modify the bioavailability of the synthetic compounds to benthic organisms. This project will be expanded to study partitioning of synthetic organics to particulate matter indigenous to the Great Lakes."
        },
        {
            "spans": [
                {
                    "offset": 15252,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 15,
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                }
            ],
            "content": "-"
        },
        {
            "spans": [
                {
                    "offset": 15254,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 15,
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                }
            ],
            "content": "-"
        },
        {
            "spans": [
                {
                    "offset": 15256,
                    "length": 17
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 15,
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                }
            ],
            "content": "6. Presentations:"
        },
        {
            "spans": [
                {
                    "offset": 15274,
                    "length": 242
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 15,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Eadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner, and T. Nalepa. 1982. Bioconcentrations of PAH by some benthic organisms of the Great Lakes. 7th International Symposium on Polynuclear Aromatic Hydrocarbons. October 26-28, Columbus, Ohio."
        },
        {
            "spans": [
                {
                    "offset": 15517,
                    "length": 231
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 15,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Eadie, B. J., J. A. Robbins, R. L. Chambers, C. P. Rice, C. Schelski, and W. Frez. 1982. Sediment Trap Measurements of Resuspension and Settling Fluxes in Lake Michigan. Am. Soc. of Limn. and Ocn. Fall Mtg, San Francisco Dec. 7-15."
        },
        {
            "spans": [
                {
                    "offset": 15749,
                    "length": 213
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 15,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Robbins, J. A. and B. J. Eadie. Beryllium-7: A tracer of seasonal particle transport processes in Lake Michigan. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982."
        },
        {
            "spans": [
                {
                    "offset": 15963,
                    "length": 311
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 15,
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                }
            ],
            "content": "Landrum, P. F., S. R. Nihart, B. J. Eadie, and W. S. Gardner. 1982. Reverse Phase Separation Method for Determining Pollutant Binding in Aldrich\u00ae Humic Acid and Dissolved Organic Carbon of Natural Waters. 3rd Annual Meeting of Society of Environmental Toxicology and Chemistry. November 14-17, Washington, D. C."
        },
        {
            "spans": [
                {
                    "offset": 16275,
                    "length": 16
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                    "pageNumber": 15,
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            ],
            "content": "7. Publications:"
        },
        {
            "spans": [
                {
                    "offset": 16292,
                    "length": 177
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            ],
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                    "pageNumber": 15,
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                }
            ],
            "content": "Eadie, B. J., Faust, W., Gardner, W. S., and Nalepa, T. (1982a) : Polycyclic Aromatic Hydrocarbons in Sediments and Associated Benthos in Lake Erie. Chemosphere 11(2) : 185-191."
        },
        {
            "spans": [
                {
                    "offset": 16470,
                    "length": 189
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            ],
            "boundingRegions": [
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                    "pageNumber": 15,
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                }
            ],
            "content": "Eadie, B. J., Landrum, P. F., and Faust, W. (1982b) : Polycyclic Aromatic Hydrocarbons in Sediments, Pore Water and the Amphipod Pontoporeia hoyi from Lake Michigan. Chemosphere 11:857-858."
        },
        {
            "spans": [
                {
                    "offset": 16660,
                    "length": 241
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "Eadie, B. J., Rice, C. P., and Frez, W. A. (1982) : The role of the benthic boundary in the cycling of PCBs in the Great Lakes. pp 213-228 in: Physical behavior of PCBs in the Great Lakes. D. Mackay et al. eds., Ann Arbor: Ann Arbor Science."
        },
        {
            "spans": [
                {
                    "offset": 16902,
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            ],
            "content": "10"
        },
        {
            "spans": [
                {
                    "offset": 16905,
                    "length": 321
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            ],
            "boundingRegions": [
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                    "pageNumber": 16,
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                }
            ],
            "content": "Eadie, B. J., P. F. Landrum, W. R. Faust, N. R. Morehead, W. S. Gardner, and T. Nalepa (1983). Bioconcentrations of PAH by some benthic organisms of the Great Lakes. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium, Battelle Press. (In Press)"
        },
        {
            "spans": [
                {
                    "offset": 17227,
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                }
            ],
            "content": "Eadie, B. J. (1983). Polycyclic Aromatic Hydrocarbons in the Great Lakes. In: Toxic Contaminants in the Great Lakes. J. Nriagu ed. Wiley Interscience (In Press)"
        },
        {
            "spans": [
                {
                    "offset": 17388,
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                }
            ],
            "content": "Eadie, B. J., S. Nihart, and J. A. Robbins (1982). Study of Early Diagenesis of Compounds in Great Lakes Sediments is Underway. Coastal Ocn. and Climat."
        },
        {
            "spans": [
                {
                    "offset": 17541,
                    "length": 11
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            ],
            "content": "News: 4 43."
        },
        {
            "spans": [
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                    "length": 151
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            ],
            "content": "Eadie, B. J., W. Faust, and P. F. Landrum. Polycyclic Aromatic Hydrocarbons in Benthic Organisms of the Great Lakes. Coastal Ocn. Poll. Ass. News: 2 4."
        },
        {
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            "content": "11"
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            "content": "PROGRESS REPORT"
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            ],
            "content": "March 1983"
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        {
            "spans": [
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                    "length": 109
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            ],
            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104"
        },
        {
            "spans": [
                {
                    "offset": 17845,
                    "length": 47
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            ],
            "content": "2. Principal Investigator: Dr. Peter F. Landrum"
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            "content": "3. Title: Role of Benthic Invertebrates in the Fate of Pollutants in the Great Lakes"
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            "content": "4. Project Summary : The objectives of this project are to determine the uptake, depuration and biotransformation rate constants for various toxic organics in Great Lakes invertebrates. A further objective is to determine the empirical relationships between the rate constants and environmental parameters such as temperature, pollutant concentration and sediment sorption. The past six months work has focused on two areas, binding of organic xenobiotics to humic and fulvic acids and the effect of environmental parameters on the toxicokinetic rate constants for Pontoporeia hoyi."
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            "spans": [
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            ],
            "content": "5. Status: Studies of humics binding of organic xenobiotics were compared using a reverse phase separation technique with the dialysis technique of Carter (1982). The reverse phase technique employs the use of a Waters C-18 Sep-Pak\u00ae to separate humic bound compound from freely dissolved compound. The results between the two methods were comparable. However, a slight but consistent bias between the two methods was observed for partitioning between Aldrich@ humic acid and water (Figure 1) and various natural humic and fulvic acids and water (Figure 2). This bias was thought to occur due to failure on the dialysis system to achieve equilibrium. Comparison between the binding of Aldrich\u00ae humics and natural dissolved organic carbon (DOC) were also made (Table 1). There appeared to be less interaction between the xenobiotic and the natural DOC with compounds having low water solubility i.e. benzo (a)pyrene and pp'-DDT relative to Aldrich\u00ae binding. However, biphenyl had an increased binding in some natural waters of about two orders of magnitude relative to Aldrich\u00ae humics. Anthracene binding remains about the same with the two types of material. The log of the reverse phase partition coefficient was proportional to the log Octano1-water partition coefficient (Figure 3) and inversely proportional to the log water solubility of the various compounds (Figure 4). The correlation co- efficient for the regression was better for the correlation with log solubility than log Octanol-water partition coefficient implying that the aqueous solubility of the compound is driving the system. The method for determining binding using reverse phase separation has been sufficiently tested to be useful for examining the effect of environmental parameters on the extent of binding and the role of humic binding to bioavailability. A manuscript is in preparation on this work. Further work will focus on the relationship between binding and bioavailability."
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            "content": "12"
        },
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            "content": "6"
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            "content": "Log Reverse Phase Partition Coefficient"
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            "content": "DDT"
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            "content": "\u00b7 Anth HR"
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            "content": "\u00b7 HCB HR"
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            "content": "(n=15)"
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            "content": "L. Michigan"
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            "content": "4.7 (spring)"
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            "content": "17.0 \u00b1 2.0 (n=17)"
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            "content": "ax + SE"
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            "content": "17"
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            ],
            "content": "Studies to examine the role of competing pollutants on the uptake of polycyclic aromatic hydrocarbons (PAH) revealed that reduction of the uptake rate constant occurs when small molecules are present in sufficient concentration (Table 2). The reduction in the uptake rate constant is greatest when the PAH has low water solubility (Table 3) and when the interaction occurs with less water soluble aromatic co-contaminants. There was a greater reduction at lower concentration of co-contaminant with aromatic as opposed to aliphatic or alicyclic co- contaminants of similar aqueous solubilities. These findings describe the impact. of co-contaminants on bioavailability and transport of PAH under conditions of spills or complex effluent inputs to the aquatic system. Bioavailability will be reduced in the short term. However, the stabilization of PAH in the water column- by co-contaminants will enhance the distribution of PAH and may well prolong the exposure of aquatic organisms to low levels of PAH."
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            ],
            "content": "The effects of environmental parameters on the toxicokinetics of polycyclic aromatic hydrocarbons in Pontoporeia hoyi continue to be investigated. Studies repeating the effect of temperature confirmed the results found previously with anthracene. For BaP, anthracene and 2,5,2', 5'-tetrachlorobiphenyl (TCB) the uptake rate constant increased at the rate of approximately 10 ml . g-1.h-1. \u00bac-1. However, the biphenyl uptake rate constant was not dependent on temperature. All the com- pounds had increased elimination rate constants with temperature except the TCB that had no measurable depuration. This is contrary to results previously reported for anthracene. However, the animals used in these studies did not appear to be as stressed from the high temperature as those used previously. Seasonal variation in the uptake rate constant for all compounds except biphenyl was similar to that previously reported for anthracene. The depuration rate constant may also be seasonally dependent, decreasing in the summer and increasing in the fall and winter."
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            ],
            "content": "Uptake of PAH sorbed to sediment has been examined for both anthracene and BaP. Anthracene uptake was most confusing. The uptake of the compound was very rapid and remained at a fixed concentration over the subsequent 18-19 days. Since the depuration half life is 9.3 days, anthracene should have contined to accumulate in the animal over the entire course of the experiment. More research on this compound is required."
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            ],
            "content": "BaP uptake from sediment has been examined three times and the uptake rate constant was determined to be 1.0(+0.4) x10-3 g dry sed .g wet animal --. h-1. Using this result and the seasonal average uptake rate constant from water 111+50 ml.g wet animal-1.h -- and average depuration rate constant 1.99(+0.9) x10-3h-1; the steady state concentration for Pontoporeia hoyi was predicted from measured concentrations of BaP in sediment and water from three sites in Lake Michigan. The predicted concentrations compared with the measured values (Table 4)."
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            ],
            "content": "The largest error in uptake is that of the uptake from water resulting from both the rate constant, because of the seasonal variability, and the water concentration due to the extremely low levels with the subsequently large analytical error. Further studies of uptake from sediment are necessary to define the size fraction responsible for uptake. Also, other PAH will have to be studied for development of emperical relationships between compounds."
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            "content": "18"
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            "content": "TABLE 2"
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            ],
            "content": "INHIBITION OF BENZO(A) PYRENE UPTAKE IN PONTOPOREIA HOYI BY SMALL MOLECULES"
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            "content": "Compound"
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            "content": "I, 50 (mg.L -1)"
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            "content": "Log P"
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            "content": "Water Solubility (mg\u00b7L-1)"
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            "content": "Toluene"
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            "content": "0.74"
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            "content": "2.70"
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            "content": "Benzene"
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            "content": "5.0"
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            "content": "2.13"
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            "content": "Hexane"
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            "content": "Cyclohexane"
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            "content": "Ethylacetate"
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            "content": "Acetone"
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            "content": "**"
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            "content": "** Totally miscible"
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            "content": "19"
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            "content": "TABLE 3"
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            "content": "CONCENTRATION OF TOLUENE RESULTING IN FIFTY PERCENT REDUCTION IN UPTAKE RATE CONSTANT OF PAH FOR PONTOPOREIA HOYI"
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                        2.9889,
                        4.3835,
                        2.9879,
                        4.5222,
                        2.3138,
                        4.5174
                    ]
                }
            ],
            "content": "Compound"
        },
        {
            "spans": [
                {
                    "offset": 26684,
                    "length": 15
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
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                        4.3788,
                        4.5846,
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                        3.5568,
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                }
            ],
            "content": "Toluene If * 50"
        },
        {
            "spans": [
                {
                    "offset": 26700,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
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                }
            ],
            "content": "(mg.L-1)"
        },
        {
            "spans": [
                {
                    "offset": 26709,
                    "length": 31
                }
            ],
            "boundingRegions": [
                {
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                }
            ],
            "content": "Water Solubility (21) (ng\u00b7mL-1)"
        },
        {
            "spans": [
                {
                    "offset": 26741,
                    "length": 15
                }
            ],
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                }
            ],
            "content": "Benzo (a)pyrene"
        },
        {
            "spans": [
                {
                    "offset": 26757,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
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                }
            ],
            "content": "0.74"
        },
        {
            "spans": [
                {
                    "offset": 26762,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
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                }
            ],
            "content": "3.8"
        },
        {
            "spans": [
                {
                    "offset": 26766,
                    "length": 10
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Anthracene"
        },
        {
            "spans": [
                {
                    "offset": 26777,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
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                }
            ],
            "content": "2.2"
        },
        {
            "spans": [
                {
                    "offset": 26781,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        5.9041,
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                        5.4974,
                        6.0714,
                        5.6265,
                        5.9041,
                        5.6265
                    ]
                }
            ],
            "content": "74"
        },
        {
            "spans": [
                {
                    "offset": 26784,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        2.0605,
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                        2.725,
                        5.8033,
                        2.7239,
                        5.9515,
                        2.0594,
                        5.9468
                    ]
                }
            ],
            "content": "Bipheny1"
        },
        {
            "spans": [
                {
                    "offset": 26793,
                    "length": 5
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        3.8915,
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                        5.8083,
                        4.2404,
                        5.9228,
                        3.8962,
                        5.9372
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                }
            ],
            "content": "10 **"
        },
        {
            "spans": [
                {
                    "offset": 26799,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        5.732,
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                        5.8368,
                        6.0714,
                        5.9563,
                        5.732,
                        5.9563
                    ]
                }
            ],
            "content": "8080"
        },
        {
            "spans": [
                {
                    "offset": 26804,
                    "length": 94
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        1.9659,
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                        6.7513,
                        6.3292,
                        6.7494,
                        6.6533,
                        1.964,
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                }
            ],
            "content": "*I50 = Concentration of co-contaminant resulting in a 50% 50 reduction in uptake rate constant"
        },
        {
            "spans": [
                {
                    "offset": 26899,
                    "length": 65
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        1.8884,
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                        6.6494,
                        6.573,
                        6.9515,
                        1.8874,
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                }
            ],
            "content": "** No effect at highest concentration tested 10 mg.L-1 of toluene"
        },
        {
            "spans": [
                {
                    "offset": 26965,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 25,
                    "polygon": [
                        4.2309,
                        10.1439,
                        4.3982,
                        10.1439,
                        4.3982,
                        10.2634,
                        4.2309,
                        10.2634
                    ]
                }
            ],
            "content": "20"
        },
        {
            "spans": [
                {
                    "offset": 26968,
                    "length": 7
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.8913,
                        3.0633,
                        2.4755,
                        3.0633,
                        2.4755,
                        3.1829,
                        1.8913,
                        3.1829
                    ]
                }
            ],
            "content": "TABLE 4"
        },
        {
            "spans": [
                {
                    "offset": 26976,
                    "length": 90
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.877,
                        3.3935,
                        6.8519,
                        3.3935,
                        6.8519,
                        3.6999,
                        1.877,
                        3.6999
                    ]
                }
            ],
            "content": "MEASURED AND PREDICTED CONCENTRATIONS OF BENZO (A) PYRENE FOR THREE SITES IN LAKE MICHIGAN"
        },
        {
            "spans": [
                {
                    "offset": 27067,
                    "length": 28
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        2.0589,
                        4.2407,
                        4.5919,
                        4.2407,
                        4.5919,
                        4.3843,
                        2.0589,
                        4.3843
                    ]
                }
            ],
            "content": "Site* Sediment Concentration"
        },
        {
            "spans": [
                {
                    "offset": 27096,
                    "length": 25
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        4.7301,
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                        4.2359,
                        6.8567,
                        4.3795,
                        4.7307,
                        4.3891
                    ]
                }
            ],
            "content": "Pontoporeia Concentration"
        },
        {
            "spans": [
                {
                    "offset": 27122,
                    "length": 9
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        5.0659,
                        4.413,
                        5.8608,
                        4.413,
                        5.8608,
                        4.547,
                        5.0659,
                        4.547
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                }
            ],
            "content": "Predicted"
        },
        {
            "spans": [
                {
                    "offset": 27132,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        6.0714,
                        4.413,
                        6.7609,
                        4.413,
                        6.7609,
                        4.5375,
                        6.0714,
                        4.5375
                    ]
                }
            ],
            "content": "Measured"
        },
        {
            "spans": [
                {
                    "offset": 27141,
                    "length": 17
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        2.8699,
                        4.5662,
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                        4.5422,
                        4.319,
                        4.7241,
                        2.8729,
                        4.7481
                    ]
                }
            ],
            "content": "ng.g dry weight-1"
        },
        {
            "spans": [
                {
                    "offset": 27159,
                    "length": 19
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        5.1402,
                        4.5853,
                        6.6006,
                        4.5614,
                        6.6029,
                        4.705,
                        5.1425,
                        4.7289
                    ]
                }
            ],
            "content": "ng . g wet animal-I"
        },
        {
            "spans": [
                {
                    "offset": 27179,
                    "length": 6
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.9632,
                        5.0879,
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                        5.0879,
                        2.4851,
                        5.2219,
                        1.9632,
                        5.2219
                    ]
                }
            ],
            "content": "Hi Sed"
        },
        {
            "spans": [
                {
                    "offset": 27186,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        3.4667,
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                        5.0735,
                        3.7444,
                        5.2315,
                        3.4667,
                        5.2315
                    ]
                }
            ],
            "content": "400"
        },
        {
            "spans": [
                {
                    "offset": 27190,
                    "length": 10
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        5.0795,
                        5.0879,
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                        5.0831,
                        5.8472,
                        5.2123,
                        5.0803,
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                    ]
                }
            ],
            "content": "647\u00b1205 **"
        },
        {
            "spans": [
                {
                    "offset": 27201,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        6.2582,
                        5.0927,
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                        5.0927,
                        6.5024,
                        5.2123,
                        6.2582,
                        5.2123
                    ]
                }
            ],
            "content": "900"
        },
        {
            "spans": [
                {
                    "offset": 27205,
                    "length": 11
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.8865,
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                        5.4325,
                        2.8202,
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                        1.8865,
                        5.557
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                }
            ],
            "content": "45m Station"
        },
        {
            "spans": [
                {
                    "offset": 27217,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        3.5672,
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                        3.5672,
                        5.557
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                }
            ],
            "content": "40"
        },
        {
            "spans": [
                {
                    "offset": 27220,
                    "length": 7
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        5.0755,
                        5.4277,
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                        5.4277,
                        5.674,
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                        5.0755,
                        5.5522
                    ]
                }
            ],
            "content": "466\u00b1115"
        },
        {
            "spans": [
                {
                    "offset": 27228,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        6.2534,
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                        6.2534,
                        5.5474
                    ]
                }
            ],
            "content": "400"
        },
        {
            "spans": [
                {
                    "offset": 27232,
                    "length": 11
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.8913,
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                        5.7676,
                        2.8202,
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                    ]
                }
            ],
            "content": "24m Station"
        },
        {
            "spans": [
                {
                    "offset": 27244,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        3.572,
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                        3.572,
                        5.8872
                    ]
                }
            ],
            "content": "30"
        },
        {
            "spans": [
                {
                    "offset": 27247,
                    "length": 7
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        5.0755,
                        5.7628,
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                        5.7628,
                        5.6692,
                        5.892,
                        5.0755,
                        5.892
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                }
            ],
            "content": "461+112"
        },
        {
            "spans": [
                {
                    "offset": 27255,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        6.2604,
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                        5.7724,
                        6.5097,
                        5.8873,
                        6.2582,
                        5.8824
                    ]
                }
            ],
            "content": "280"
        },
        {
            "spans": [
                {
                    "offset": 27259,
                    "length": 92
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.9775,
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                        6.646,
                        6.2558,
                        6.646,
                        6.5573,
                        1.9775,
                        6.5573
                    ]
                }
            ],
            "content": "*The 45m and 24m Stations are just south of Grand Haven. The Hi Sed site is near South Haven"
        },
        {
            "spans": [
                {
                    "offset": 27352,
                    "length": 142
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        1.8961,
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                        6.5908,
                        6.5981,
                        7.079,
                        1.8961,
                        7.079
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                }
            ],
            "content": "** 1SD determined from the errors of the rate constants. The water concentration used for these predictions was held constant at 0.008 ng.ml-1"
        },
        {
            "spans": [
                {
                    "offset": 27495,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 26,
                    "polygon": [
                        4.263,
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                        4.4387,
                        10.238,
                        4.442,
                        10.3576,
                        4.2663,
                        10.3625
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                }
            ],
            "content": "21"
        },
        {
            "spans": [
                {
                    "offset": 27498,
                    "length": 14
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        0.7506,
                        1.023,
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                    ]
                }
            ],
            "content": "6. References:"
        },
        {
            "spans": [
                {
                    "offset": 27513,
                    "length": 119
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        1.0865,
                        1.3699,
                        7.1771,
                        1.4293,
                        7.1742,
                        1.7303,
                        1.0836,
                        1.6709
                    ]
                }
            ],
            "content": "Carter, C. W. and I. H. Suffet (1982). Binding of DDT to dissolved humic materials. Environm. Sci. Techno1. 16:735-740."
        },
        {
            "spans": [
                {
                    "offset": 27633,
                    "length": 12
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        0.7427,
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                        1.8088,
                        1.8738,
                        1.8071,
                        2.003,
                        0.741,
                        1.9886
                    ]
                }
            ],
            "content": "7. Products:"
        },
        {
            "spans": [
                {
                    "offset": 27646,
                    "length": 133
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        1.0624,
                        2.2085,
                        7.5069,
                        2.2609,
                        7.5043,
                        2.5792,
                        1.0598,
                        2.5268
                    ]
                }
            ],
            "content": "Landrum, P.F. (1982). Uptake, depuration and biotransformation of anthracene by the scud, Pontoporeia hoyi. Chemosphere 11:1049-1057."
        },
        {
            "spans": [
                {
                    "offset": 27780,
                    "length": 287
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        1.0581,
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                        7.5837,
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                        7.5764,
                        3.4535,
                        1.0508,
                        3.3817
                    ]
                }
            ],
            "content": "Landrum, P.F. (1983). The effect of co-contaminants on the bioavailability of polycyclic aromatic hydrocarbons to Pontoporeia hoyi. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium, Battelle Press. (In Press)"
        },
        {
            "spans": [
                {
                    "offset": 28068,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        8.2801,
                        2.7917,
                        8.3279,
                        2.7917,
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                        8.2801,
                        2.8539
                    ]
                }
            ],
            "content": "."
        },
        {
            "spans": [
                {
                    "offset": 28070,
                    "length": 293
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        1.0627,
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                    ]
                }
            ],
            "content": "Eadie, B. J., P. F. Landrum, W. R. Faust, N. R. Morehead, W. S. Gardner and T. Nalepa (1983). Bioconcentrations of PAH by some benthic organisms of the Great Lakes. In Polynuclear Aromatic Hydrocarbons: Combustion Processes, Environmental Effects and Biochemistry. 7th International Symposium,"
        },
        {
            "spans": [
                {
                    "offset": 28364,
                    "length": 26
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
                        1.286,
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                        4.4075,
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                    ]
                }
            ],
            "content": "Battelle Press. (In Press)"
        },
        {
            "spans": [
                {
                    "offset": 28391,
                    "length": 197
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Spacie, A., P. F. Landrum, and G. J. Leversee (1983). Rates of uptake, depuration and biotransformation of anthracene and benzo (a)pyrene in fish. Ecotoxicology and Environmental Safety. (In Press)"
        },
        {
            "spans": [
                {
                    "offset": 28589,
                    "length": 17
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 27,
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                }
            ],
            "content": "8. Presentations:"
        },
        {
            "spans": [
                {
                    "offset": 28607,
                    "length": 213
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Landrum, P. F. 1982. Influence of competing pollutants on the bioavailability of benzo(a)pyrene to Pontoporeia hoyi. 7th International Symposium on Polynuclear Aromatic Hydrocarbons, October 26-28, Columbus, Ohio."
        },
        {
            "spans": [
                {
                    "offset": 28821,
                    "length": 241
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            ],
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                }
            ],
            "content": "Eadie, B. J., P. F. Landrum, W. Faust, W. S. Gardner and T. Nalepa. 1982. Bioconcentrations of PAH by some benthic organisms of the Great Lakes. 7th International Symposium on Polynuclear Aromatic Hydrocarbons. October 26-28, Columbus, Ohio."
        },
        {
            "spans": [
                {
                    "offset": 29063,
                    "length": 309
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            ],
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                }
            ],
            "content": "Landrum, P. F., S. R. Nihart, B. J. Eadie and W. S. Gardner. 1982. Reverse Phase Separation Method for Determining Pollutant Binding in Aldrich Humic Acid and Dissolved Organic Carbon of Natural Waters. 3rd Annual Meeting of Society of Environmental Toxicology and Chemistry. November 14-17, Washington, D. C."
        },
        {
            "spans": [
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                    "offset": 29373,
                    "length": 178
                }
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            ],
            "content": "Landrum, P. F. (1982). Fate of Polynuclear Aromatic Hydrocarbons in Aquatic Organisms. Department of Environmental Toxicology, University of California, Davis. December 14, 1982."
        },
        {
            "spans": [
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                    "length": 2
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            "content": "22"
        },
        {
            "spans": [
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                    "length": 14
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            ],
            "content": "PROGESS REPORT"
        },
        {
            "spans": [
                {
                    "offset": 29570,
                    "length": 11
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "March, 1983"
        },
        {
            "spans": [
                {
                    "offset": 29582,
                    "length": 67
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 28,
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            ],
            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA"
        },
        {
            "spans": [
                {
                    "offset": 29650,
                    "length": 41
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "2300 Washtenaw Avenue Ann Arbor, MI 48104"
        },
        {
            "spans": [
                {
                    "offset": 29692,
                    "length": 44
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 28,
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                }
            ],
            "content": "- 2. Principal Investigator: John A. Robbins"
        },
        {
            "spans": [
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            ],
            "boundingRegions": [
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            ],
            "content": "3. Title: Application of particle-associated radiotracers to studies of the transport and fate of aquatic microcontaminants"
        },
        {
            "spans": [
                {
                    "offset": 29861,
                    "length": 412
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            ],
            "boundingRegions": [
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            ],
            "content": "4. Project Summary: There are two central aims of this project: (1) to characterize sedimentation and sediment integration processes as a basis for quantitative interpretation of sediment contaminant distributions and (II) to characterize vertical transport processes in the water column and calibrate models for the vertical distribution of contaminants with particular emphasis on the benthic nepheloid region."
        },
        {
            "spans": [
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                    "offset": 30274,
                    "length": 1253
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            ],
            "boundingRegions": [
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            ],
            "content": "For part (I) cores are being collected from the high sedimentation areas of each of the Great Lakes and analyzed radiometrically to determine rates of sediment reworking and sedimentation. Radiometric methods have been shown to provide a measure of the extent of sediment homogenization by organisms inhabiting the upper 1-10 cm. This mixing process is of major importance in determining the efficiency with which contaminants are buried and removed from contact with overlying water. The mixing of contaminant-laden surface sediments is one of the major factors affecting persistence of contaminants in the Great Lakes. By careful examination of cores from the high sedimentation areas and in adjacent areas with significantly lower rates of sedimentation and differing mixing characteristics, it is expected that diagenetic models can be built which include the principal physical transport processes and distinguish between time-dependent changes in the rate of contaminant deposition and post-depositional chemical transformations. For part (II) radiometric measurements are being made on trap and water samples with the aim of inferring particle residence times and re- suspension fluxes in various segments of the water column on a seasonal basis."
        },
        {
            "spans": [
                {
                    "offset": 31528,
                    "length": 784
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            ],
            "boundingRegions": [
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                    "pageNumber": 28,
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            ],
            "content": "5. Status: Part I. Box and gravity cores have now been obtained in the high sedi- mentation areas of all lakes but Superior. Samples from Lake Ontario were collected by personnel from the Canada Centre for Inland Waters (CCIW) in June 1981. Cores from Lakes Erie, Huron, and Michigan were collected aboard the R/V Simons in October 1981 by GLERL staff members (J. Robbins) and individuals under contract (K. Johansen, University of Michigan; S. Eisenreich, University of Minnesota), as well as scientists from CCIW and elsewhere. In June 1982, addi- tional cores were collected in Lake Erie aboard the CCIW ship CCS Limos by GLERL and CCIW personnel. At this point many of the cores from Lakes Ontario, Erie and Michigan have been catalogued and analyzed for dry weight, radionuclides"
        },
        {
            "spans": [
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            "content": "23"
        },
        {
            "spans": [
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            ],
            "boundingRegions": [
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                    "pageNumber": 29,
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            ],
            "content": "(cesium-137, lead-210), major and minor elements, and organic contaminants. Cores from Huron are further back in the queue, but have been logged, freeze- dried, and analyzed for radionuclides. The radionuclide analysis shows that the cores are of a quality which merit the full analysis for major and minor elements and organic compounds proposed by the study."
        },
        {
            "spans": [
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            "boundingRegions": [
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            ],
            "content": "Within the past six months we have completed analysis of Cs and Be in 137 7 additional cores from Lake Erie. The results provide strong clues as to the nature of sediment focusing and mixing processes. Integrated amounts of Cs"
        },
        {
            "spans": [
                {
                    "offset": 32904,
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            ],
            "boundingRegions": [
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                    "pageNumber": 29,
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            ],
            "content": "and Be in three cores are given in Table 1 along with decay-corrected amounts entering the lakes from the atmosphere. In the case of 13 Cs the total deposition on the lake surface from about 1950 to the time of collection of the cores is approximately 10 dpm/cm2. In the Lake Michigan core and in the core from the central basin of Lake Erie (G16) the total amount is roughly 30 dpm/cm2, or more than three times the atmospheric loading. In the eastern basin where sedimen- tation rates are extraordinarily high, the amount of 137Cs stored is nearly an order of magnitude higher than the atmospheric loading. As the radionuclide is deposited essentially uniformly on the lake surface and other sources are negligible, its preferential accumulation in areas of high sedimentation indicates the extreme degree of long term contaminant focusing which occurs in the Great Lakes sediments. Now look at the behavior of another short-lived radionuclide in the same cores. The standing crop of the cosmogenic radionuclide, Be(t]=53.4 days), is expected to be about 2.3 dpm/cm- whereas the measured amount in the three cores ranges from 0.8 to 1.1 dpm/cm2. As can bee seen in Table 1, the ratio of amount in the core to the standing crop shows relatively little variability in the three cores. Moreover, far less of the amount present in the lake system resides in the sediments. This latter effect is most likely due to the residence time of the radionuclide in overlying waters: a considerable fraction decays before arrival at the sediment-water interface. The absence of strong focusing of this isotope, which probably possesses hydrodynamic characteristics comparable to those of 13 Cs, suggests that on time scales comparable to the half-life of Be, deposition is relatively uniform over the lake bottom. These results indicate that particle associated radionuclies with half-lives of the order of a few months to a few years are of value in chronicling the sequence of deposition and resuspension which results in preferential accumulation of contaminants in the low energy regions of the lake bottom."
        },
        {
            "spans": [
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            "boundingRegions": [
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            "content": "The vertical profile of 137 Cs in the high sedimentation core (LS) is shown in Figure 1. The distribution is remarkable in that the peak corresponding to the 1963-1964 maximum in fallout to the lake surface occurs so deep in the core (around 20 cm). In most other areas of the Great Lakes, the entire profile is confined to the upper 10 to 15 cm or less. The extraordinarily high sedimentation rates in the eastern end of Lake Erie make the area particularly valuable for this present study. In some of the other 1982 cores from this part of the lake, the peak appears to occur below the bottom of the box core at about 40 cm! In Figure 1 the line which approximately follows the data points is the result_of our steady-state mixing model calculation. The calculation assumes that 137 Cs added to sediments is instantaneously mixed with previous inputs over a depth of fixed thickness which moves upward as new sediments are added. From the figure"
        },
        {
            "spans": [
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            "content": "24"
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        {
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            "boundingRegions": [
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            "content": "it can be seen that the extent of mixing resulting from least squares evaluation of the mixed depth and sedimentation rate is about 6 cm in this core. This is the zone over which the activity is expected to be constant."
        },
        {
            "spans": [
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            "content": "Comparison with actual data shows that significant details in the profile are not reproduced by the model although the general shape of the profile is. Note that the shaded area in the figure is the profile expected in the absence of mixing. Careful consideration of the figure will convince you that the structure apparent in the unmixed profile between 0 and 12 cm is seen in the actual data. This correspondence is seen in other cores from this area as well. Our conclusion from these observations is that when sedimentation rates are high, mixing is in- complete and that in areas of high sedimentation, we have access to details which allow us to develop more realistic models of how sediment mixing occurs. Further evidence for the incompleteness of sediment mixing can be seen in Figure 2. In the lower panel is a profile of Be in the same core. Far from being uniformly mixed over 6 cm, the activity decreases expoentially to undetectable levels within the upper two centimeters of the core. Currently we are developing a kinetic model of sediment mixing which takes account of the way which the oligochaete worms, abundantly present in these sediments, actually redistribute particles. Because of their conveyor belt feeding mode, they introduce an advective component into the sediment reworking process. This model development is important in character- izing the time scales for sediment contaminant-water interactions."
        },
        {
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            "boundingRegions": [
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            "content": "Part II. Within the past few months we have completed the pilot study of radio- nuclide fluxes determined from sediment traps placed in 100 m of water 34 km west of Grand Haven, Michigan in Lake Michigan. Samples were collected for eight approximately monthly intervals from April through December at 4 to 7 water depths. All samples have now been analyzed for 137 Cs and both surface and near-bottom trap samples have been analyzed for 'Be."
        },
        {
            "spans": [
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            "content": "Mass flux profiles for the eight sampling periods shown in Figure 3 are typical of open lake stations. Prior to stratification (April-May and May-June), fluxes are essentially uniform in the water column. With the onset of stratification, fluxes decrease drastically throughout the water column but remain high in the bottom-most trap (5-20 m off the bottom). Consistently high fluxes near the bottom result from local and non-local resuspension processes. Distributions of the activity of 13 Cs in the same samples are shown in Figure 4. The significance of the results can be understood in terms of the geochemistry of this isotope and its history of loading in the lake. Very little 13 Cs is currently coming into the lake. During the sampling period the average deposition rate was about 1 dpm/m2/d as compared with the 1963 peak fallout rate of 170 dpm/m2/d. Because of the short residence time of the radionuclide in the lake, 95% of the total load now resides in the sediments. 137Cs is strongly associated with clay minerals to which it may be irreversibly bound. Therefore, most of the 137Cs present in trap materials is likely to originate from sediments and is an indicator of the amount of resuspended materials. During the prestratification period (April-May) the activity of the isotope is essentially uniform in trap materials throughout the water column. As stratification progresses, the activity in samples from the"
        },
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            "content": "25"
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            ],
            "content": "upper part of the water column vanishes. Particles from the epilimnion entering the traps do not carry 137 Cs and the resuspended component is relegated to bottom waters with the reduction in turbulent mixing which accompanies stratification of the lake. During November to December, as surface waters turn over, the 13/Cs activity again reappears in near surface samples."
        },
        {
            "spans": [
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            ],
            "content": "Fluxes of the two isotopes during the isothermal period are summarized in Table 2. For 137 Cs, surface traps yield a flux of 130 dpm/m2/d and bottom traps a flux of 270 dpm/m2/d. Thus, the flux of 13 Cs through the water column ranges from about 120 to 250 times the current rate of loading from the atmosphere. Clearly resuspension of bottom materials during the isothermal period_is of enormous importance in the cycling of contaminants in the lake. For Be the picture is different as can be seen in Table 2. The trap fluxes of the isotopes is about half the atmospheric flux in surface waters and comparable to the atmospheric flux in the near-bottom traps. Fluxes are expected to be lower than atmospheric fluxes because of the scavenging efficiency and radioactive decay effects for beryllium. Application of a box model to 137Cs fluxes during the isothermal period suggest that the isotope is resuspended out of a mixed layer approximately 40 mg/cm- in thickness. This layer thickness is also implied by fluxes of 'Be during the isothermal period."
        },
        {
            "spans": [
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            "boundingRegions": [
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                    "pageNumber": 31,
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            ],
            "content": "The activity of Be in surface trap materials is shown in Figure 5. Large un- certainties accompany the values because of the very small amount of material collected during stratification. In a model system with an abrupt onset of stratification of fixed depth and constant residence time, the activity of Be should build up in epilimnetic trap materials throughout June and then fall off slightly in the remaining months prior to fall overturn. The actual results show a drastic early reduction in activity which begins in July-August. While the reasons remain to be determined, most likely it is due to enhanced scavenging of the radionuclide by plankton and by authigenic calcite. In bottom traps which"
        },
        {
            "spans": [
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                    "offset": 41618,
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                    "pageNumber": 31,
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            ],
            "content": "collect predominantly resuspended materials throughout the whole season, the activity of Be decreases expoentially after stratification sets in (Figure 6). In contrast, the activity of\"> Cs increases slightly (about 15%) over the same period. The exponential decrease suggests that when the lake is stratified, new inputs of Be to the pool of resuspendable sediments is sharply curtailed. Furthermore, if there were no additions of the isotope during this period and no losses from the pool to unresuspendable sediments, then the activity in the pool should decrease with a half-life equal to the half-life of the isotope it- self. Within experimental error this is in fact the case. As seen in Figure 6, the activity in the trap material decreases with an apparent half-life of 54\u00b16 days. Much further work will be done to determine the geochemical characteristics of 7Be, its particle affinities, and the extent to which its behavior may be indicative of the behavior of contaminants in the water column and the benthic nepheloid layer in particular."
        },
        {
            "spans": [
                {
                    "offset": 42671,
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            ],
            "content": "6. Papers presented:"
        },
        {
            "spans": [
                {
                    "offset": 42692,
                    "length": 187
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 31,
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                }
            ],
            "content": "Robbins, J. A. Bioturbation and lake recovery times. Invited paper, 30th Annual Meeting of the North American Benthological Society, Ann Arbor, Michigan, May 18-21, 1982. Abstracts, p. 7."
        },
        {
            "spans": [
                {
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            "content": "26"
        },
        {
            "spans": [
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            "boundingRegions": [
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                    "pageNumber": 32,
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                }
            ],
            "content": "Robbins, J. A. and B. J. Eadie. Beryllium-7: A tracer of seasonal particle transport processes in Lake Michigan. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982."
        },
        {
            "spans": [
                {
                    "offset": 43097,
                    "length": 246
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0354,
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                        7.6463,
                        1.9998,
                        7.6452,
                        2.6511,
                        1.0343,
                        2.6402
                    ]
                }
            ],
            "content": "Johansen, K. A. and J. A. Robbins. Use of Be-7 Ce-144, and Cs-137 to characterize short term mixing processes and rates in Great Lakes sediments. American Society of Limnology and Oceanography Fall Meeting, San Francisco, CA, December 7-15, 1982."
        },
        {
            "spans": [
                {
                    "offset": 43344,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
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                        2.8706,
                        0.1533,
                        2.8669
                    ]
                }
            ],
            "content": "."
        },
        {
            "spans": [
                {
                    "offset": 43346,
                    "length": 16
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
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                        2.8131,
                        2.0325,
                        2.9809,
                        0.6471,
                        2.9809
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                }
            ],
            "content": "-7. Other talks:"
        },
        {
            "spans": [
                {
                    "offset": 43363,
                    "length": 92
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0221,
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                        3.1582,
                        7.3416,
                        3.5113,
                        1.0199,
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                    ]
                }
            ],
            "content": "Use of 7Be and 137Cs in studies of seasonal particle transport processes in aquatic systems."
        },
        {
            "spans": [
                {
                    "offset": 43456,
                    "length": 203
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0306,
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                        1.0306,
                        4.1406
                    ]
                }
            ],
            "content": "Cosmogenic Be and fallout 137Cs in Lake Michigan: behavior of two radionuclides with contrasting half-lives. Seminar at the Great Lakes Environmental Research Laboratory, Ann Arbor, MI, February 17, 1983"
        },
        {
            "spans": [
                {
                    "offset": 43660,
                    "length": 53
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
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                        4.3275,
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                }
            ],
            "content": "8. Abstracts generated and accepted for future talks:"
        },
        {
            "spans": [
                {
                    "offset": 43714,
                    "length": 253
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.021,
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                        7.5691,
                        5.3243,
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                        5.3243
                    ]
                }
            ],
            "content": "Robbins, J. A. and B. J. Eadie. Seasonal cycling for Be-7 and Cs-137 in the benthic nephloid layer of Lake Michigan. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 43968,
                    "length": 250
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0208,
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                        5.498,
                        7.8189,
                        6.1711,
                        1.0217,
                        6.1796
                    ]
                }
            ],
            "content": "Robbins, J. A., K. A. Johansen. Beryllium-7: A tracer of short term sediment mixing processes in the Great Lakes. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 44219,
                    "length": 271
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
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                        1.0266,
                        7.0122
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                }
            ],
            "content": "Rossman, R., R. A. Bourbonniere, K. A. Johansen, and J. A. Robbins. Vertical variation of metals in dated Lake Ontario sediment cores. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 44491,
                    "length": 289
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0354,
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                        7.6745,
                        7.203,
                        7.6745,
                        7.8595,
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                        7.8595
                    ]
                }
            ],
            "content": "Johansen, K. A., R. Rossman, and J. A. Robbins. History of lead and mercury deposition in lead-210 and cesium-137 dated cores from eastern Lake Ontario. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 44781,
                    "length": 303
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0354,
                        8.0416,
                        8.0532,
                        8.0416,
                        8.0532,
                        8.703,
                        1.0354,
                        8.703
                    ]
                }
            ],
            "content": "Eisenreich, S. J., P. D. Chapel, J. A. Robbins, and R. A. Bourbonniere. Chlorinated hydrocarbon concentrations and fluxes in sediment cores from eastern Lake Ontario. 26th Conference on Great Lakes Research, International Association for Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 45085,
                    "length": 256
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        1.0305,
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                        8.8945,
                        7.8905,
                        9.5523,
                        1.031,
                        9.5573
                    ]
                }
            ],
            "content": "Schelske, C. L., E. F. Stoermer, D. J. Conley, J. A. Robbins, and R. M. Glover. Sedimentary evidence for anthropogenic modifications of silica cycles in the Great Lakes. 26th Conference on Great Lakes Research, Oswego, N. Y. , May 24-26, 1983. (Accepted) ."
        },
        {
            "spans": [
                {
                    "offset": 45342,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 32,
                    "polygon": [
                        4.2519,
                        10.1695,
                        4.4245,
                        10.1695,
                        4.4245,
                        10.2941,
                        4.2519,
                        10.2941
                    ]
                }
            ],
            "content": "27"
        },
        {
            "spans": [
                {
                    "offset": 45345,
                    "length": 68
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        1.0804,
                        1.0182,
                        6.865,
                        1.0947,
                        6.8631,
                        1.2381,
                        1.0785,
                        1.1617
                    ]
                }
            ],
            "content": "Hugel, E., and J. A. Robbins. Seasonal variations in the activity of"
        },
        {
            "spans": [
                {
                    "offset": 45414,
                    "length": 142
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        1.3195,
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                        1.2558,
                        7.5231,
                        1.5882,
                        1.3162,
                        1.5275
                    ]
                }
            ],
            "content": "polonium-210 in sediment trap samples from Lake Michigan. 26th Conference on Great Lakes Research, Oswego, N. Y., May 24-26, 1983. (Accepted)."
        },
        {
            "spans": [
                {
                    "offset": 45557,
                    "length": 247
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        1.0661,
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                        2.4358,
                        1.0574,
                        2.3487
                    ]
                }
            ],
            "content": "Keilty, T. and J. A. Robbins. Are tubificid abundances in Lake Erie sediments controlled by the rate of supply of organic carbon? 46th Annual Meeting of the American Society of Limnology and Oceanography, St. Johns, Newfoundland, June 13-16, 1983."
        },
        {
            "spans": [
                {
                    "offset": 45805,
                    "length": 45
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        0.7284,
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                        4.5607,
                        2.5766,
                        4.5588,
                        2.72,
                        0.7265,
                        2.6677
                    ]
                }
            ],
            "content": "9. Articles submitted, in press or published:"
        },
        {
            "spans": [
                {
                    "offset": 45851,
                    "length": 301
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        1.047,
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                        2.9535,
                        7.5958,
                        3.7605,
                        1.0377,
                        3.6847
                    ]
                }
            ],
            "content": "Robbins, J. A. Stratigraphic and dynamic effects of sediment reworking by Great Lakes zoobenthos. In: Developments in Hydrology 9, Sediment/Fresh- water Interaction, Ed. P. G. Sly. Proc. of the 2nd International Symposium on Sediment-Water Interactions, Kingston, Ont. Hydrobiologia 92 (1982) 611-622."
        },
        {
            "spans": [
                {
                    "offset": 46153,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 33,
                    "polygon": [
                        4.2295,
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                        4.3934,
                        10.12,
                        4.39,
                        10.2347,
                        4.2261,
                        10.2299
                    ]
                }
            ],
            "content": "28"
        },
        {
            "spans": [
                {
                    "offset": 46156,
                    "length": 47
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
                        1.1266,
                        3.4574,
                        5.8354,
                        3.5176,
                        5.8336,
                        3.6603,
                        1.1248,
                        3.6
                    ]
                }
            ],
            "content": "Table 1 CUMULATIVE RADIONUCLIDE DEPOSITION DATA"
        },
        {
            "spans": [
                {
                    "offset": 46204,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
                        5.7283,
                        4.0304,
                        6.4194,
                        4.0352,
                        6.4186,
                        4.155,
                        5.7275,
                        4.1502
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                }
            ],
            "content": "Location"
        },
        {
            "spans": [
                {
                    "offset": 46213,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
                        1.951,
                        4.6822,
                        2.6269,
                        4.6822,
                        2.6269,
                        4.802,
                        1.951,
                        4.802
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                }
            ],
            "content": "Variable"
        },
        {
            "spans": [
                {
                    "offset": 46222,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
                        4.9709,
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                        4.5144,
                        5.3928,
                        4.8164,
                        4.9709,
                        4.8164
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                }
            ],
            "content": "LM-81 HS"
        },
        {
            "spans": [
                {
                    "offset": 46231,
                    "length": 5
                }
            ],
            "boundingRegions": [
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                    "polygon": [
                        5.805,
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                        4.5384,
                        6.2364,
                        4.6582,
                        5.805,
                        4.6582
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                }
            ],
            "content": "LE-82"
        },
        {
            "spans": [
                {
                    "offset": 46237,
                    "length": 3
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        4.7109,
                        6.1502,
                        4.8259,
                        5.8913,
                        4.8259
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                }
            ],
            "content": "G16"
        },
        {
            "spans": [
                {
                    "offset": 46241,
                    "length": 8
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            ],
            "boundingRegions": [
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                    "polygon": [
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                        7.0753,
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                }
            ],
            "content": "LE-82 LS"
        },
        {
            "spans": [
                {
                    "offset": 46250,
                    "length": 15
                }
            ],
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                    "pageNumber": 34,
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                        1.1071,
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                        2.2623,
                        5.2002,
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                        5.4106,
                        1.1084,
                        5.4179
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                }
            ],
            "content": "Cs137 (dpm/cm2)"
        },
        {
            "spans": [
                {
                    "offset": 46266,
                    "length": 17
                }
            ],
            "boundingRegions": [
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                        2.7036,
                        5.4442,
                        2.7021,
                        5.588,
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                }
            ],
            "content": "Lake-wide loading"
        },
        {
            "spans": [
                {
                    "offset": 46284,
                    "length": 1
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            ],
            "boundingRegions": [
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                    "polygon": [
                        5.0524,
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                        5.4633,
                        5.1339,
                        5.5831,
                        5.0524,
                        5.5831
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                }
            ],
            "content": "9"
        },
        {
            "spans": [
                {
                    "offset": 46286,
                    "length": 2
                }
            ],
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                    "polygon": [
                        5.8913,
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                        5.8913,
                        5.5879
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                }
            ],
            "content": "10"
        },
        {
            "spans": [
                {
                    "offset": 46289,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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            ],
            "content": "10"
        },
        {
            "spans": [
                {
                    "offset": 46292,
                    "length": 17
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                    "polygon": [
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            ],
            "content": "In sediment cores"
        },
        {
            "spans": [
                {
                    "offset": 46310,
                    "length": 2
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            ],
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                    "polygon": [
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                        5.0428,
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            ],
            "content": "30"
        },
        {
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                    "offset": 46313,
                    "length": 2
                }
            ],
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                    "polygon": [
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                        5.6406,
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            ],
            "content": "33"
        },
        {
            "spans": [
                {
                    "offset": 46316,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        6.8932,
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            ],
            "content": "85"
        },
        {
            "spans": [
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                    "length": 16
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                    "polygon": [
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            ],
            "content": "Ratio (sed/lake)"
        },
        {
            "spans": [
                {
                    "offset": 46336,
                    "length": 3
                }
            ],
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                    "polygon": [
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                        5.3113,
                        5.9234,
                        5.0476,
                        5.9234
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            ],
            "content": "3.3"
        },
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            "spans": [
                {
                    "offset": 46340,
                    "length": 3
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        5.933,
                        5.8891,
                        5.9281
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            ],
            "content": "3.3"
        },
        {
            "spans": [
                {
                    "offset": 46344,
                    "length": 3
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        5.8228,
                        6.9869,
                        5.9379,
                        6.7233,
                        5.9331
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            ],
            "content": "8.5"
        },
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            "spans": [
                {
                    "offset": 46348,
                    "length": 12
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            ],
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                    "polygon": [
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            ],
            "content": "Be7(dpm/cm2)"
        },
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                    "offset": 46361,
                    "length": 18
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            ],
            "content": "Lake-wide loading*"
        },
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            "spans": [
                {
                    "offset": 46380,
                    "length": 4
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            ],
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                    "polygon": [
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            ],
            "content": "\u20aa2.3"
        },
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            "spans": [
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                    "offset": 46385,
                    "length": 4
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            ],
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            ],
            "content": "22.3"
        },
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                    "offset": 46390,
                    "length": 4
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                }
            ],
            "content": "22.3"
        },
        {
            "spans": [
                {
                    "offset": 46395,
                    "length": 17
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            ],
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            ],
            "content": "In sediment cores"
        },
        {
            "spans": [
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                    "offset": 46413,
                    "length": 3
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            ],
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                        6.7573
                    ]
                }
            ],
            "content": "1.0"
        },
        {
            "spans": [
                {
                    "offset": 46417,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                        6.6327,
                        6.1404,
                        6.7909,
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                    ]
                }
            ],
            "content": "0.8"
        },
        {
            "spans": [
                {
                    "offset": 46421,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                        6.6614,
                        6.9699,
                        6.7764,
                        6.7206,
                        6.7764
                    ]
                }
            ],
            "content": "1.1"
        },
        {
            "spans": [
                {
                    "offset": 46425,
                    "length": 16
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 34,
                    "polygon": [
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                        6.786,
                        2.5933,
                        6.9394,
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                        6.9394
                    ]
                }
            ],
            "content": "Ratio (sed/lake)"
        },
        {
            "spans": [
                {
                    "offset": 46442,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                    ]
                }
            ],
            "content": "0.43"
        },
        {
            "spans": [
                {
                    "offset": 46447,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                        6.9394,
                        5.8721,
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                    ]
                }
            ],
            "content": "0.35"
        },
        {
            "spans": [
                {
                    "offset": 46452,
                    "length": 4
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 34,
                    "polygon": [
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                        6.9441,
                        6.7158,
                        6.949
                    ]
                }
            ],
            "content": "0.48"
        },
        {
            "spans": [
                {
                    "offset": 46457,
                    "length": 62
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                        6.3946,
                        7.3995,
                        6.3938,
                        7.5624,
                        1.0873,
                        7.5337
                    ]
                }
            ],
            "content": "*Approximately the standing crop - flux/1. 2 = 0.693/53.4 days"
        },
        {
            "spans": [
                {
                    "offset": 46520,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 34,
                    "polygon": [
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                        4.3765,
                        10.2174,
                        4.3765,
                        10.3468,
                        4.1944,
                        10.3468
                    ]
                }
            ],
            "content": "29"
        },
        {
            "spans": [
                {
                    "offset": 46523,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        2.4667,
                        7.8069,
                        2.4614
                    ]
                }
            ],
            "content": "4"
        },
        {
            "spans": [
                {
                    "offset": 46525,
                    "length": 61
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        2.9351,
                        5.4953,
                        3.2344,
                        1.1481,
                        3.1737
                    ]
                }
            ],
            "content": "Table 2 RADIONUCLIDE FLUXES AS DETERMINED FROM SEDIMENT TRAPS"
        },
        {
            "spans": [
                {
                    "offset": 46587,
                    "length": 60
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        6.6483,
                        3.5948,
                        1.6621,
                        3.5423
                    ]
                }
            ],
            "content": "(Lake Michigan, Stn. 7, May-June, 1982. Unstratified Lake. )"
        },
        {
            "spans": [
                {
                    "offset": 46648,
                    "length": 23
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        5.1535,
                        4.1206,
                        5.1481,
                        4.433,
                        4.0533,
                        4.4139
                    ]
                }
            ],
            "content": "Surface Traps (10-20 m)"
        },
        {
            "spans": [
                {
                    "offset": 46672,
                    "length": 27
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        4.1494,
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                        4.4507,
                        5.5511,
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                    ]
                }
            ],
            "content": "Near-bottom Traps (80-95 m)"
        },
        {
            "spans": [
                {
                    "offset": 46700,
                    "length": 12
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        1.1282,
                        4.7421,
                        2.1274,
                        4.7421,
                        2.1274,
                        4.8951,
                        1.1282,
                        4.8951
                    ]
                }
            ],
            "content": "Beryllium-7:"
        },
        {
            "spans": [
                {
                    "offset": 46713,
                    "length": 16
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        1.525,
                        4.9046,
                        2.878,
                        4.9142,
                        2.8768,
                        5.0815,
                        1.5238,
                        5.072
                    ]
                }
            ],
            "content": "Activity (dpm/g)"
        },
        {
            "spans": [
                {
                    "offset": 46730,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        4.1209,
                        4.9237,
                        4.8093,
                        4.9285,
                        4.8082,
                        5.0911,
                        4.1198,
                        5.0863
                    ]
                }
            ],
            "content": "22.8 \u00b1 4"
        },
        {
            "spans": [
                {
                    "offset": 46739,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        5.8085,
                        4.962,
                        6.4739,
                        4.9668,
                        6.473,
                        5.0958,
                        5.8076,
                        5.0911
                    ]
                }
            ],
            "content": "22.5 \u00b1 2"
        },
        {
            "spans": [
                {
                    "offset": 46748,
                    "length": 15
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        1.5346,
                        5.2201,
                        2.7871,
                        5.2201,
                        2.7871,
                        5.4113,
                        1.5346,
                        5.4113
                    ]
                }
            ],
            "content": "Flux (dpm/m2/d)"
        },
        {
            "spans": [
                {
                    "offset": 46764,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
                        4.1209,
                        5.2775,
                        4.7998,
                        5.2823,
                        4.7989,
                        5.4066,
                        4.12,
                        5.4018
                    ]
                }
            ],
            "content": "150 \u00b1 30"
        },
        {
            "spans": [
                {
                    "offset": 46773,
                    "length": 8
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        5.3014,
                        6.473,
                        5.4257,
                        5.7989,
                        5.4161
                    ]
                }
            ],
            "content": "260 \u00b1 30"
        },
        {
            "spans": [
                {
                    "offset": 46782,
                    "length": 10
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        5.5452,
                        2.3855,
                        5.7316,
                        1.5202,
                        5.7173
                    ]
                }
            ],
            "content": "FTrap/FAir"
        },
        {
            "spans": [
                {
                    "offset": 46793,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        5.6265,
                        4.3791,
                        5.6265,
                        4.3791,
                        5.7507,
                        4.1257,
                        5.7507
                    ]
                }
            ],
            "content": "0.5"
        },
        {
            "spans": [
                {
                    "offset": 46797,
                    "length": 3
                }
            ],
            "boundingRegions": [
                {
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                    "polygon": [
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                        6.0523,
                        5.6504,
                        6.0501,
                        5.7699,
                        5.7919,
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                }
            ],
            "content": "0.9"
        },
        {
            "spans": [
                {
                    "offset": 46801,
                    "length": 11
                }
            ],
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                {
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                    "polygon": [
                        1.1139,
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                        2.0222,
                        6.1045,
                        2.0209,
                        6.2336,
                        1.1125,
                        6.224
                    ]
                }
            ],
            "content": "Cesium-137:"
        },
        {
            "spans": [
                {
                    "offset": 46813,
                    "length": 16
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 35,
                    "polygon": [
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                        6.2718,
                        2.8684,
                        6.4343,
                        1.5107,
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                    ]
                }
            ],
            "content": "Activity (dpm/g)"
        },
        {
            "spans": [
                {
                    "offset": 46830,
                    "length": 10
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        6.2957,
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                        6.3053,
                        4.9528,
                        6.4295,
                        4.1243,
                        6.42
                    ]
                }
            ],
            "content": "20.4 \u00b1 0.6"
        },
        {
            "spans": [
                {
                    "offset": 46841,
                    "length": 10
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        6.4487,
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                    ]
                }
            ],
            "content": "23.6 \u00b1 0.4"
        },
        {
            "spans": [
                {
                    "offset": 46852,
                    "length": 14
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
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                        6.5682,
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                        1.5202,
                        6.7642
                    ]
                }
            ],
            "content": "Flux (dpm/m2/d"
        },
        {
            "spans": [
                {
                    "offset": 46867,
                    "length": 7
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        6.7594,
                        4.1209,
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                    ]
                }
            ],
            "content": "130 \u00b1 4"
        },
        {
            "spans": [
                {
                    "offset": 46875,
                    "length": 7
                }
            ],
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                    "polygon": [
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                        5.7921,
                        6.7689
                    ]
                }
            ],
            "content": "270 \u00b1 5"
        },
        {
            "spans": [
                {
                    "offset": 46883,
                    "length": 10
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 35,
                    "polygon": [
                        1.525,
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                        2.3664,
                        6.8885,
                        2.3664,
                        7.0892,
                        1.525,
                        7.0892
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                }
            ],
            "content": "FTrap/FAir"
        },
        {
            "spans": [
                {
                    "offset": 46894,
                    "length": 3
                }
            ],
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                {
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                    "polygon": [
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                        4.3743,
                        7.0892,
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                        7.0892
                    ]
                }
            ],
            "content": "120"
        },
        {
            "spans": [
                {
                    "offset": 46898,
                    "length": 3
                }
            ],
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                    "polygon": [
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                    ]
                }
            ],
            "content": "250"
        },
        {
            "spans": [
                {
                    "offset": 46902,
                    "length": 20
                }
            ],
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                }
            ],
            "content": "*Water Depth: 100 m."
        },
        {
            "spans": [
                {
                    "offset": 46923,
                    "length": 2
                }
            ],
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                        4.2309,
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                    ]
                }
            ],
            "content": "30"
        },
        {
            "spans": [
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                    "offset": 46926,
                    "length": 1
                }
            ],
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                        1.1741
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                }
            ],
            "content": "-"
        },
        {
            "spans": [
                {
                    "offset": 46928,
                    "length": 15
                }
            ],
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                }
            ],
            "content": "Cs-137 (dpm /g)"
        },
        {
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                {
                    "offset": 46944,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "."
        },
        {
            "spans": [
                {
                    "offset": 46946,
                    "length": 1
                }
            ],
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                }
            ],
            "content": "5"
        },
        {
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                {
                    "offset": 46948,
                    "length": 2
                }
            ],
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                }
            ],
            "content": "10"
        },
        {
            "spans": [
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                    "offset": 46951,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 36,
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                        1.6342,
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                }
            ],
            "content": "15"
        },
        {
            "spans": [
                {
                    "offset": 46954,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 36,
                    "polygon": [
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                }
            ],
            "content": "20"
        },
        {
            "spans": [
                {
                    "offset": 46957,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                        1.9936,
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                        2.2141,
                        1.8359,
                        2.2141
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                }
            ],
            "content": "2"
        },
        {
            "spans": [
                {
                    "offset": 46959,
                    "length": 1
                }
            ],
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                }
            ],
            "content": "4"
        },
        {
            "spans": [
                {
                    "offset": 46961,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "6"
        },
        {
            "spans": [
                {
                    "offset": 46963,
                    "length": 1
                }
            ],
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                }
            ],
            "content": "8"
        },
        {
            "spans": [
                {
                    "offset": 46965,
                    "length": 2
                }
            ],
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                }
            ],
            "content": "10"
        },
        {
            "spans": [
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                    "offset": 46968,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "12"
        },
        {
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                    "offset": 46971,
                    "length": 10
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                }
            ],
            "content": "DEPTH (cm)"
        },
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                    "length": 2
                }
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                }
            ],
            "content": "14"
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            "content": "1982"
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            "content": "20"
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            "content": "WATER DEPTH (m)"
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            "content": "40"
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            "content": "Aug 17 - Sept 13|Sept 13 - Oct 27 Nov 1 - Nov 17"
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            "content": "40"
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            "content": "11/2 = 54 \u00b1 6 days"
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            "content": "51"
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            "content": "LAKE MICHIGAN STATION 7, 1982 ( 0 80m , \u00b7 95 m)"
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            "content": "S"
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            "content": "OND"
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            "content": "MONTH"
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            "content": "Fig.6."
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            "content": "36"
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            "content": "PROGRESS REPORT"
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            "content": "APRIL, 1983"
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            ],
            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104"
        },
        {
            "spans": [
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                    "offset": 48320,
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            ],
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            ],
            "content": "2. Principal Investigator: Michael J. McCormick"
        },
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            ],
            "content": "3. Title: Vertical Dynamics of Toxic Organics in the Great Lakes"
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            "spans": [
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                    "length": 503
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            ],
            "boundingRegions": [
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            ],
            "content": "4. Project Summary: The objectives of this project are twofold: (1) to quantitatively described the decomposition pathways of persistent contaminants, and (2) to improve such models by identifying and then minimizing the major sources of prediction errors. A one-dimensional model has been completed and used to investigate the Mirex problem in Lake Ontario. Current efforts are focused on error analyses and on improving the predictability of submodels detailing vertical mixing and photodecomposition."
        },
        {
            "spans": [
                {
                    "offset": 48937,
                    "length": 659
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            ],
            "content": "5. Status: Over the past six months progress has been made on process parame- terizations and error analyses. In particular, a global radiation model (Atwater and Brown, 1974) using cloud information from coastal meteorological stations on Lake Michigan has been programmed and is currently being compared against measured solar radiation data from Madison, Wisconsin. This model will be used to improve estimates of both photodecomposition losses and the intensity of vertical mixing. Both processes are strongly dependent upon knowing the irradiance which, in general, must be modeled due to the sparse radiation gathering network in the Great Lakes region."
        },
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            "spans": [
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            ],
            "content": "Error analyses have been performed on two models to examine transport uncertainty on prediction estimates. A preliminary error analysis dealt with leakage of Mirex from the sediments of Lake Ontario into the water column and its vertical transport therein. The results suggest gross uncertainty in particle associated concentrations of Mirex in surface waters, during winter, and suggests that vertical eddy diffusion is a major error source. The other model dealt with uncertainty in nutrient regeneration rates in Lake Michigan. In this case horizontal advection was a major error source. Comparison of vertically to horizontally associated errors indicates an error dominance due to horizontal variability. Therefore, guidelines are being developed to provide minimum estimates of error bounds for different applications of horizontal averaged one-dimensional models."
        },
        {
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            "content": "Error analyses have motivated additional work on vertical mixing. Comparisons have been made between two eddy diffusion models of McCormick and Scavia (1981) and Henderson-Sellers (1980). The results indicate similarities under three conditions: (1) constant current shear, (2) high Richardson number, and (3) low wind speed. Differences occur in treatment of low diffusion situations which may significantly affect rate loss estimates in the toxic's model."
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            "content": "37"
        },
        {
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                    "length": 271
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            ],
            "content": "Resolving discrepencies in the two approaches is an ongoing problem with alternative methods being addressed. The most hopeful approach involves an integral type model (Pollard et al. 1973) to estimate vertical mixing and is currently being implemented for Lake Michigan."
        },
        {
            "spans": [
                {
                    "offset": 51201,
                    "length": 41
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            ],
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            ],
            "content": "Products are listed under separate title."
        },
        {
            "spans": [
                {
                    "offset": 51243,
                    "length": 14
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            ],
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            "content": "6. References:"
        },
        {
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                    "length": 182
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            ],
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                    "pageNumber": 43,
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                    ]
                }
            ],
            "content": "Atwater, M. A. and P. S. Brown, Jr. (1974) Numerical Computations of the Latitudial Variations of Solar Radiation for an Atmosphere of Varying Opacity. J. Appl. Met. 13:(2), 289-297."
        },
        {
            "spans": [
                {
                    "offset": 51441,
                    "length": 180
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 43,
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                }
            ],
            "content": "Henderson-Sellers, B. (1980) Limnological Modelling: Simulation of Vertical Profiles to Temperature, Dissolved Oxygen and Nutrients. I. Theory. J. Limnol. Soc. Sth. Afr., 6, 49-54."
        },
        {
            "spans": [
                {
                    "offset": 51622,
                    "length": 186
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 43,
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                }
            ],
            "content": "McCormick, M. J. and D. Scavia (1981) Calculation of Vertical Profiles of Lake-Averaged Temperature and Diffusivity in Lakes Ontario and Washington. Water. Resour. Res. 17: (2), 305-310."
        },
        {
            "spans": [
                {
                    "offset": 51809,
                    "length": 135
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Pollard, R. T., P. B. Rhines and R. O. R. Y. Thompson (1973) The Deepening of the Wind-Mixed Layer. J. Geophys. Fluid Dyn., 3, 381-404."
        },
        {
            "spans": [
                {
                    "offset": 51945,
                    "length": 12
                }
            ],
            "boundingRegions": [
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            "content": "7. Products:"
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        {
            "spans": [
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                    "offset": 51958,
                    "length": 184
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            ],
            "content": "Henderson-Sellers, B., M. J. McCormick and D. Scavia (1983) A Comparison of the Formulation for Eddy Diffusion in Two One-Dimensional Stratification Models. Appl. Math. Mod. (In Press)"
        },
        {
            "spans": [
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                    "offset": 52143,
                    "length": 246
                }
            ],
            "boundingRegions": [
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            ],
            "content": "Henderson-Sellers, B. and M. J. McCormick (1983) Vertical Eddy Diffusion Formulations in One-Dimensional Thermal Stratification Models for Lakes and Reservoirs. To be presented at Fourth Inter. Conf. on Math. Mod., Zurich, Switzerland, 15 August."
        },
        {
            "spans": [
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                    "offset": 52390,
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            ],
            "content": "McCormick, M. J. and S. J. Tarapchak (1983) Error Analysis of Nutrient Regeneration Rates for a Station in Southern Lake Michigan. To be presented at 26 Conf. International Assoc. for Great Lakes Res., 25 May."
        },
        {
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                    "offset": 52600,
                    "length": 2
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            "content": "38"
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                    "offset": 52603,
                    "length": 15
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            "content": "PROGRESS REPORT"
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            "spans": [
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                    "offset": 52619,
                    "length": 10
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            "content": "April 1983"
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            "spans": [
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                    "length": 109
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            ],
            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Avenue Ann Arbor, MI 48104"
        },
        {
            "spans": [
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                    "offset": 52740,
                    "length": 61
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            "content": "2. Principal Investigator: John R. Bennett and Anne H. Clites"
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            "content": "3. Title: Modeling the Transport of Toxic Substances"
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            "content": "4. Project Summary: The objective of this project is to develop methods to predict the temporal and spatial movement of toxics in the Great Lakes."
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            "spans": [
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                    "offset": 53002,
                    "length": 289
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            ],
            "boundingRegions": [
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                    "pageNumber": 44,
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                }
            ],
            "content": "A two-dimensional, vertically integrated model and a three-dimensional, thermally stratified model will be used to calculate currents in Lake Michigan. These currents will then drive a water quality model that will advect, diffuse, settle, and resuspend particles and dissolved substances."
        },
        {
            "spans": [
                {
                    "offset": 53292,
                    "length": 269
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "5. Status: In order to predict the motion and fate of toxics in the Great Lakes, the currents must first be known. The model wind stress and current fields will be generated by a circulation model developed by Schwab, Bennett, and Jessup (1981) for other GLERL studies."
        },
        {
            "spans": [
                {
                    "offset": 53562,
                    "length": 500
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            ],
            "boundingRegions": [
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                    "pageNumber": 44,
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                }
            ],
            "content": "Our goal in this project is to use these currents to simulate the movement of dissolved and particulate-bound materials in any of the Great Lakes. Toward that end we have developed a general computer program which calculates advective motion, settling, and resuspension. This program, documented in Bennett, Clites, and Schwab (1983), uses the grid generation programs developed by Schwab and Sellers (1980) and is designed to use the currents simulated by the previously mentioned circulation model."
        },
        {
            "spans": [
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                    "offset": 54063,
                    "length": 569
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "The model has been tested for pure advection using an idealized lake. Its numerical accuracy has been found to be more than adequate for our purposes. We are continuing to test the effects of settling and resuspension in idealized cases. Eventually, we intend to verify the model by comparison with data from sediment traps currently moored in Lake Michigan. Radionuclides will be used as particle tracers to infer suspended sediment transport paths. When verification of this vertically integrated model is complete, we will begin testing a three- dimensional version."
        },
        {
            "spans": [
                {
                    "offset": 54633,
                    "length": 14
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            ],
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            ],
            "content": "6. References:"
        },
        {
            "spans": [
                {
                    "offset": 54648,
                    "length": 224
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 44,
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                    ]
                }
            ],
            "content": "Bennett, J. R., A. H. Clites, and D. J. Schwab 1983. A two-dimensional lake circulation modeling system: Programs to compute particle trajectories and the motion of dissolved substances. (In press) NOAA Technical Memorandum."
        },
        {
            "spans": [
                {
                    "offset": 54873,
                    "length": 2
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            "content": "39"
        },
        {
            "spans": [
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                }
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            "content": "Schwab, D. J. and D. L. Sellers (1980) : Computerized bathymetry and shorelines of the Great Lakes, NOAA Data Report ERL-GLERL-16, National Technical Information Service, Springfield, VA. 22151. 13 pp."
        },
        {
            "spans": [
                {
                    "offset": 55078,
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                }
            ],
            "content": "Schwab, D. J., J. R. Bennett, and A. T. Jessup (1981). A two-dimensional lake circulation modeling system, NOAA Technical Memorandum ERL-GLERL-38, National Technical Information Service, Springfield, VA 22151. 79 pp."
        },
        {
            "spans": [
                {
                    "offset": 55295,
                    "length": 12
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                }
            ],
            "content": "7. Products:"
        },
        {
            "spans": [
                {
                    "offset": 55308,
                    "length": 227
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 45,
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                    ]
                }
            ],
            "content": "Bennett, J. R., A. H. Clites, and D. J. Schwab (1983). A two-dimensional lake circulation modeling system: Programs to compute particle trajectories and the motion of dissolved substances. (In press). NOAA Technical Memorandum."
        },
        {
            "spans": [
                {
                    "offset": 55536,
                    "length": 2
                }
            ],
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                }
            ],
            "content": "40"
        },
        {
            "spans": [
                {
                    "offset": 55539,
                    "length": 27
                }
            ],
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                    "pageNumber": 46,
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            ],
            "content": "PROGRESS REPORT MARCH, 1983"
        },
        {
            "spans": [
                {
                    "offset": 55567,
                    "length": 150
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 46,
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            ],
            "content": "1. Organization: Great Lakes Research Division and Department of Atmospheric and Oceanic Sciences The University of Michigan Ann Arbor, Michigan 48109"
        },
        {
            "spans": [
                {
                    "offset": 55718,
                    "length": 65
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 46,
                    "polygon": [
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                }
            ],
            "content": "2. Principal Investigators: Clifford P. Rice and Philip A. Meyers"
        },
        {
            "spans": [
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                    "offset": 55784,
                    "length": 29
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            ],
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                }
            ],
            "content": "3. Amount of 1983 Funds: 60 K"
        },
        {
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                {
                    "offset": 55814,
                    "length": 36
                }
            ],
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                    "pageNumber": 46,
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                }
            ],
            "content": "4. Total Project Funds to Date: 60 K"
        },
        {
            "spans": [
                {
                    "offset": 55851,
                    "length": 81
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 46,
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                }
            ],
            "content": "5. Title: Partitioning and Cycling of Toxic Organics in the Great Lakes Ecosystem"
        },
        {
            "spans": [
                {
                    "offset": 55933,
                    "length": 670
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 46,
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                }
            ],
            "content": "6. Project Summary: The objective of this project is to study the role particle suspension plays in the continued recycling of toxic organic compounds in the Great Lake system. Emphasis will be placed on analyses of the suspended and settling particulate portions of the samples. Both selected toxic organics, e.g. pesticides (dieldrin, DDT, etc.), PCBs, phthalates, and chlorobenzenes, and non- selective GC-MS scans will be performed. Analyses of lipid biomarkers of samples will be performed in order to follow biogeochemical cycling at the sediment/water and epilimnion/hypolimnion interfaces and in other turbidity zones, such as river plumes and coastal locations."
        },
        {
            "spans": [
                {
                    "offset": 56604,
                    "length": 826
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            ],
            "boundingRegions": [
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                    "pageNumber": 46,
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                }
            ],
            "content": "7. Status: Our major effort for the chlororganic studies has been to develop methods to identify and quantitate the individual isomers which constitute the PCBs in the Lake Michigan samples. A method for packed column analysis has been devised which allows partial homologue characterizations to be made. This provides data which can be used to estimate weathering of the PCB mixtures. For exact identification of the isomers in the PCBs we are using capillary separation techniques. Because of the large amount of data generated for each analysis (i.e. 50 to 60 separate chromatographic peaks) computer processing is being used. Multiple regression statistics is used to sort the data in reconstructing best matches to Aroclor types. For identification of the isomers, peak tables are constructed from exact isomer standards."
        },
        {
            "spans": [
                {
                    "offset": 57431,
                    "length": 191
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "A preliminary scan of a Lake Michigan particulate sample on the Mass Spectrometer has identified some unusual isopropyl substituted benzene compounds, studies are continuing on these samples."
        },
        {
            "spans": [
                {
                    "offset": 57623,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 46,
                    "polygon": [
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                }
            ],
            "content": "41"
        },
        {
            "spans": [
                {
                    "offset": 57626,
                    "length": 213
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
                    "polygon": [
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                }
            ],
            "content": "Information about the fates of organic compounds introduced to Great Lakes is being obtained by study of natural biomarker materials and their cycling. The amounts and types of organic-carbon-containing substances"
        },
        {
            "spans": [
                {
                    "offset": 57840,
                    "length": 15
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                }
            ],
            "content": "incorporated in"
        },
        {
            "spans": [
                {
                    "offset": 57856,
                    "length": 150
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 47,
                    "polygon": [
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                    ]
                }
            ],
            "content": "sediments of lakes are influenced by processes which accompany the sinking of particles through the water column (Meyers, et al. 1980). Organic matter"
        },
        {
            "spans": [
                {
                    "offset": 58007,
                    "length": 287
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                }
            ],
            "content": "is formed, altered, and destroyed, and that which becomes incorporated in subaqueous sediments is only a fraction of the initial material available. we have examined elemental and molecular indicators of organic matter sources and of its modification during transit to the bottom of Lake"
        },
        {
            "spans": [
                {
                    "offset": 58295,
                    "length": 399
                }
            ],
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            ],
            "content": "Michigan and in sections of dated sediment cores obtained from Lakes Michigan, Huron, Erie, and Ontario. Distribution of n-alkanol, sterol, and n-alkane biomarker compounds are dominated by aquatic components in mid-water depths, but by terrigenous components in near-surface and near-bottom depths. Surficial sediments from all locations contain similar hydrocarbon compositions which have a strong"
        },
        {
            "spans": [
                {
                    "offset": 58695,
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            ],
            "content": "terrigenous character. Subsurface sediments show"
        },
        {
            "spans": [
                {
                    "offset": 58744,
                    "length": 54
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            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                }
            ],
            "content": "hydrocarbon distributions which appear more aquatic in"
        },
        {
            "spans": [
                {
                    "offset": 58799,
                    "length": 118
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
                    "polygon": [
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                }
            ],
            "content": "origin. this contrast reflects a combination of selective resuspension of surficial sediment particles on the basis of"
        },
        {
            "spans": [
                {
                    "offset": 58918,
                    "length": 50
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
                    "polygon": [
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                }
            ],
            "content": "textural differences and microbial degradation and"
        },
        {
            "spans": [
                {
                    "offset": 58969,
                    "length": 52
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 47,
                    "polygon": [
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                }
            ],
            "content": "resynthesis of hydrocarbons within the lake bottoms."
        },
        {
            "spans": [
                {
                    "offset": 59022,
                    "length": 287
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
                    "polygon": [
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                }
            ],
            "content": "Organic matter associated with sinking particles undergoes substantial degradation and alteration prior to deposition. Aquatic material is preferentially lost relative to land derived substances, and resuspension of bottom sediments provides renewed opportunities for further alteration."
        },
        {
            "spans": [
                {
                    "offset": 59310,
                    "length": 303
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            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                }
            ],
            "content": "Progressive changes in hydrocarbon character in the cores suggests microbial activity continues deep into these lake sediments. The processes which modify and degrade natural organic compounds are likely to affect synthetic material as well. This study is improving our understanding of these processes."
        },
        {
            "spans": [
                {
                    "offset": 59614,
                    "length": 10
                }
            ],
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                }
            ],
            "content": "References"
        },
        {
            "spans": [
                {
                    "offset": 59625,
                    "length": 158
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            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                    ]
                }
            ],
            "content": "Meyers, P.A., S.J. Edwards, and B.J. Eadie. 1980. Fatty acid and hydrocarbon content of settling sediments in Lake Michigan. J. Great Lakes Res. , 6: 331-337."
        },
        {
            "spans": [
                {
                    "offset": 59784,
                    "length": 12
                }
            ],
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                    "pageNumber": 47,
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                }
            ],
            "content": "8. Products:"
        },
        {
            "spans": [
                {
                    "offset": 59797,
                    "length": 198
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 47,
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                }
            ],
            "content": "Meyers, P.A., M.J. Leenheer, B.J. Eadie, and S.J. Maule. \"Organic geochemistry of suspended and settling particulates in Lake Michigan.\" Submitted to Geochemica et Cosmochimica Acta, 3 January 1983."
        },
        {
            "spans": [
                {
                    "offset": 59996,
                    "length": 106
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                }
            ],
            "content": "Meyers, P.A., M.J. Leenheer, and B. J. Eadie. 1983. \"Organic matter alterations during sinking of sediment"
        },
        {
            "spans": [
                {
                    "offset": 60103,
                    "length": 2
                }
            ],
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                }
            ],
            "content": "42"
        },
        {
            "spans": [
                {
                    "offset": 60106,
                    "length": 27
                }
            ],
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                    "pageNumber": 48,
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                }
            ],
            "content": "particles in Lake Michigan."
        },
        {
            "spans": [
                {
                    "offset": 60134,
                    "length": 91
                }
            ],
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            ],
            "content": "North-Central Section of the Geological Society of America, Abstract with Programs, 15:238."
        },
        {
            "spans": [
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                    "offset": 60226,
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                }
            ],
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                        1.4617,
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                }
            ],
            "content": "Dunham, K.W., P.A. and B.J. Eadie. 1983."
        },
        {
            "spans": [
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            "content": "Meyers,"
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                }
            ],
            "content": "\"Hydrocarbon geochemistry of sediments from Lakes Michigan, Huron, Erie, and Ontario. North-Central Section of the Geological Society of America,"
        },
        {
            "spans": [
                {
                    "offset": 60421,
                    "length": 33
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            ],
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                }
            ],
            "content": "Abstracts with Programs, 15: 238."
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                    "offset": 60455,
                    "length": 2
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            "content": "43"
        },
        {
            "spans": [
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                    "offset": 60458,
                    "length": 114
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            ],
            "content": "1. Organization: Great Lakes Research Division The University of Michigan 2200 Bonisteel Blvd. Ann Arbor, MI 48109"
        },
        {
            "spans": [
                {
                    "offset": 60573,
                    "length": 65
                }
            ],
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                }
            ],
            "content": "2. Principal Investigators: Ronald Rossmann and Kjell A. Johansen"
        },
        {
            "spans": [
                {
                    "offset": 60639,
                    "length": 33
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "3. Amount of 1983 Funds: $47,125."
        },
        {
            "spans": [
                {
                    "offset": 60673,
                    "length": 40
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "4. Total Project Funds to Date: $93,231."
        },
        {
            "spans": [
                {
                    "offset": 60714,
                    "length": 111
                }
            ],
            "boundingRegions": [
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            ],
            "content": "5. Title: Determination of Present and Historical Fluxes in High Sedimen- tation Rate Areas of the Great Lakes."
        },
        {
            "spans": [
                {
                    "offset": 60826,
                    "length": 435
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 49,
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            ],
            "content": "6. Project Summary: The sedimentary environment of deposition is being described in detail. This includes measurement of sedimentation rates, depth of surficial sediment mixing, dilution of contaminants by non- contaminated sediments, the depth of sediment oxygenation, and the flux of metal contaminants to the sediment. From these data, the post-depositional redistribution (diagenesis, physical mixing) of contaminants is described."
        },
        {
            "spans": [
                {
                    "offset": 61262,
                    "length": 440
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            ],
            "boundingRegions": [
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                    "pageNumber": 49,
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            ],
            "content": "7. Status: Since its inception, undisturbed Lakes Michigan, Erie, and Ontario cores have been collected or obtained through co-operation with other investigators. Analysis of the Lakes Michigan and Ontario cores is complete. That of the Lake Erie cores has begun and is expected to be completed by December 1983. A comprehensive report detailing the results of work on the Lakes Ontario and Michigan cores will be completed by June 1, 1983."
        },
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            "spans": [
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                    "offset": 61703,
                    "length": 856
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            ],
            "boundingRegions": [
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                    "pageNumber": 49,
                    "polygon": [
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                }
            ],
            "content": "During the past six months, analysis of four cores from Lake Ontario and three cores from Lake Michigan for metals has been completed. The metals include arsenic, barium, bismuth, calcium, cadmium, chromium, copper, iron, mercury, magnesium, manganese, nickel, lead, antimony, vanadium, and zinc. The depth to which surficial sediments are homogenized by physical mixing has been determined for each of the cores. For all practical purposes, this depth also represents the depth of oxygen penetration. Metals proving useful for measuring the mixed depth include manganese, copper, lead, cadmium, antimony, arsenic, mercury, and nickel. Of these, manganese appears to be the most useful. Mixed depth for the Lake Ontario cores varied between one and three centimeters and for the Lake Michigan cores varied between one-half and two and one-half centimeters."
        },
        {
            "spans": [
                {
                    "offset": 62560,
                    "length": 531
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            ],
            "boundingRegions": [
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            ],
            "content": "Because the cores are dated by the Pb-210 technique, metal concentrations in recent sediments can be compared to mean concentrations in pre- industrial sediments (pre-1800). Those metals whose concentrations in recent sediments are consistently more than two times those in pre- industrial sediments include arsenic, bismuth, cadmium, mercury, manganese, lead, antimony, and zinc. Of these, the elements showing the highest enrichments are cadmium, mercury, and lead. The only element having no significant enrichment is magnesium."
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            "content": "44"
        },
        {
            "spans": [
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            ],
            "boundingRegions": [
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                    "pageNumber": 50,
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            "content": "Elements exhibiting diagenetic mobility in the Lake Ontario cores include arsenic, calcium, and manganese. In the Lake Michigan cores, those exhibiting this mobility include arsenic and manganese."
        },
        {
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            "content": "During the past six months, measurements and profile interpretations for cesium-137 and lead-210 have occurred. For each core, lead-210 and cesium-137 are measured, sedimentation rates are derived from the lead-210 and cesium-137 profiles, and dates are assigned to each core interval. Radiometric measurements are complete for nine cores from Lakes Ontario and Michigan. For the Lake Erie cores, cesium-137 measurements are still to be completed on one core, and lead-210 measurements are thirty percent completed."
        },
        {
            "spans": [
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            ],
            "content": "Based on a steady-state mixing model being applied to Lake Erie cesium-137 results, some of the highest sedimentation rates in the Great Lakes have been found, ranging from 0.079 g/cm2/yr (1.11 cm/yr) in the central basin to 0.95 g/ cm2/yr (2.78 cm/yr) in the eastern basin. The depth of physical homogenation of surficial sediments ranges from 5.2 to 13.6 cm. For one Lake St. Clair core, the sedimentation rate is 0.15 g/cm2/yr (0.32 cm/yr) with physical homogenation to a depth of 7.5 cm, giving a dating resolution of 37 years."
        },
        {
            "spans": [
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            ],
            "content": "Based on lead-210, the average sedimentation rates within the top ten centi- meters of cores from two Lake Ontario locations ranged from 0.039 g/ cm2/yr (0.19/cm/yr) to 0.076 g/cm2/yr (0.30 cm/yr)."
        },
        {
            "spans": [
                {
                    "offset": 64538,
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            ],
            "boundingRegions": [
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                    "pageNumber": 50,
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                }
            ],
            "content": "Because all three Lake Michigan cores have perturbated lead-210 profiles, special techniques had to be used to obtain sedimentation rates and core interval dates. Perturbations of the normal exponential lead-210 profile occurred at the same depths as disturbances in the stable lead, copper, and arsenic profiles. The disturbances in these stable metal profiles are attributed to and correlate with severe storm events. By averaging segments of the lead-210 profile which appeared undisturbed and had a similar slope, characteristic sedimentation rates of 0.080, 0.054, and 0.021 g/ cm2/yr were calculated for the three Lake Michigan cores. The resulting dates for intervals in each core confirm the coincidence of major sediment disturbances and major storm events for the years or year groupings of 1835, 1845, 1860, and 1869; 1905; 1913; 1916, 1918, and 1919;"
        },
        {
            "spans": [
                {
                    "offset": 65401,
                    "length": 598
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            ],
            "boundingRegions": [
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            ],
            "content": "1940; 1954; and 1958. Re-examination of the Lake Ontario cores also confirms the coincidence of major sediment disturbances and major storm events for the years or year groupings of 1780; 1811; 1835, 1845, and 1860; 1869; 1905; 1913, 1916, 1918, and 1919; 1940; 1952, 1954, and 1958; and 1971. The coincidence of stable metal and lead-210 profiles perturbations in cores from Lakes Ontario and Michigan confirms the relationship between profile perturbations and storm events. Indeed, the greatest disturbance in the cores occurred in the Lake Michigan cores during the well-documented 1954 seiche."
        },
        {
            "spans": [
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                    "offset": 66000,
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            "content": "45"
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            "content": "9. Products :"
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                }
            ],
            "content": "Rossmann, R., K. A. Johansen, and R. A. Bourbonniere, 1982. Geochemistry of Lake Ontario sediments. In: B. J. Eadie, et al., in press. The cycling of toxic organics in the Great Lakes. A three year status report. NOAA Technical Memorandum ERL GLERL-37."
        },
        {
            "spans": [
                {
                    "offset": 66270,
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                }
            ],
            "content": "Johansen, K. A., and R. Rossmann, 1982. Trace elements in Lake Ontario"
        },
        {
            "spans": [
                {
                    "offset": 66341,
                    "length": 160
                }
            ],
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                }
            ],
            "content": "cores . In: B. J. Eadie, et al., in press. The cycling of toxic organics in the Great Lakes. A three year status report. NOAA Technical Memorandum ERL GLERL-37."
        },
        {
            "spans": [
                {
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            ],
            "content": "Rossmann, R. , K. A. Johansen, R. A. Bourbonniere, and J. A. Robbins, submitted. Vertical variation of metals in dated Lake Ontario sediment cores. XXVI Annual Conf. Great Lakes Res., Internat. Assoc. Great Lakes Res ., Oswego, New York."
        },
        {
            "spans": [
                {
                    "offset": 66740,
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                }
            ],
            "content": "Johansen, K. A., R. Rossmann, and J. A. Robbins, submitted. History of Pb and Hg deposition in Pb-210 and Cs-137 dated cores from eastern Lake Ontario. XXVI Annual Conf. Great Lakes Res., Internat. Assoc. Great Lakes Res., Oswego, New York."
        },
        {
            "spans": [
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            "content": "46"
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            "content": "PROGRESS REPORT"
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                    "offset": 67000,
                    "length": 10
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            "content": "March 1983"
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        {
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                    "length": 42
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            ],
            "content": "1. Principal Investigator: Mila S. Simmons"
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            ],
            "content": "2. Affiliation: Department of Environmental & Industrial Health The University of Michigan"
        },
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            "content": "3. Amount of 1982 Sponsored Funds: $43,200"
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                    "length": 1
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            "content": "."
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                    "length": 45
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            "content": "4. Total Project Funds through 1982: $126,800"
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            "content": "5. Title: Photochemical Degradation & Transformation Studies of Toxic Organics in the Great Lakes"
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        {
            "spans": [
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                    "offset": 67334,
                    "length": 367
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            "content": "6. Project Summary: The overall objective of this research project is to conduct studies on the photochemical degradation of toxic organics. Kinetic rate constants of the photolytic process for PCBs and PAHs under natural and artificial sunlight will be incorporated in a model which will describe the cycling, transport and fate of toxic organics in the Great Lakes."
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            "spans": [
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                    "offset": 67702,
                    "length": 201
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            "content": "7. Status: Photolysis rate experiments in both natural and artificial sunlight have been conducted and decomposition rates and quantum yields for individual chlorobiphenyl isomers have been calculated."
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            "spans": [
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                    "offset": 67904,
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            "content": "Current work in progress includes the effects of microlayer, humic acids and CaCO particulates on the photolytic degradation of PAH in aquatic systems. Lake Michigan microlayer and water samples were taken on (5/20/81, 6/5/81, 6/24/81, and 8/3-5/81) at depths 1 and 10 meters. Characterization of the microlayer by GC/MS (with capillary column) revealed the presence of the high molecular weight long- chain and aromatic hydrocarbons which were practically eliminated when the samples were irradiated with a 5 Mrad dose of gamma rays. The radiation exposure was conducted to kill bacteria and plantonic materials that might change the micro- layer composition and affect the photolysis rates of the PCBs and PAHs. Work comparing irradiated vs. non-radiated microlayer effects on the photodegradation process are in progress."
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            "spans": [
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                    "offset": 68729,
                    "length": 450
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            "content": "Sunlight experiments using naphthalene at two concentrations showed a decrease of the degradation rate in Lake Michigan water compared to distilled water. Two concentrations of naphthalene in Lake Michigan microlayer showed a further decrease by a factor of two of the photolytic rate compared with deeper waters (table 8). Further studies of naphthalene with Lake Michigan water and 10, 50 and 100 ppm CaCO3 showed an increase in the observed rates."
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            "content": "On the contrary, addition of 1, 5 and 20 ppm humic acid to Lake Michigan water showed a slight decrease in the rates."
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            "content": "We investigated the effect that algae (Scenedemus) grown in our laboratory might have in the photolytic rate of naphthalene. A marked increase in the photode- composition rate of naphthalene in the presence of Cyclotella vs. Lake Michigan"
        },
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            "content": "47"
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            "content": "water was observed and further pursued. Growth medium only exhibited a decomposition rate for naphthalene comparable to that observed in Lake Michigan water. The addition of non-living Cyclotella to the growth medium showed a marginally increased rate compared to the growth medium alone. Thus it appears that algal exudates must exhibit an only marginal effect on the photolytic processes. Instead, the mechanism appears interconnected with the photo- synthetic capacity of the cells. In any case, the importance of this process in natural systems is most important as an efficient degradation pathway of toxic organic compounds."
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            "content": "."
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            "content": "48"
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            "content": "PROGRESS REPORT"
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            "spans": [
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                    "length": 11
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            ],
            "content": "APRIL, 1983"
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            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA 2300 Washtenaw Ave. Ann Arbor, MI 48104"
        },
        {
            "spans": [
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                    "offset": 70312,
                    "length": 114
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            ],
            "content": "2. Principal Investigator: David S. White Great Lakes Research Division University of Michigan Ann Arbor, MI 48109"
        },
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            ],
            "content": "3. Amount of 1983 Funds: $19.8 K"
        },
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            "spans": [
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            ],
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            ],
            "content": "4. Total Amount of Projects Funds to Date: $19.8 K"
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            "content": "5. Title: Redistribution of Sediment-Bound Toxic Organics by Benthic Invertebrates"
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            "content": "6. Project Summary: The principal object of the project is to determine the movement of toxic organics through fine-grained sediments as mediated by aquatic oligochaete feeding. This involves the determination of both mixing and burial rates which will be of primary importance in models of long-term lake recovery. Secondary in the experiments is the determination of the effects of the toxicants (in this case PCBs) on the mixing and burial processes themselves. These primarily are laboratory studies using microcosms and radiotracers and the two dominant Great Lakes' aquatic oligochaete species Stylodrilus heringianus (an \"oligotrophic\" indicator) and Limnodrilus hoffmeisteri (a \"eutrophic\" indicator) ."
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            "content": "7. Status: To this point, two major activities have occurred. The first has been an evaluation of two preliminary experiments using 14c labeled PCBs with Stylodrilus and Limnodrilus in the microcosms. We have shown that the two species have differing but predictable responses to a range of a specific PCB isomer and that their actions in redistribution of the PCBs can be monitored. That is, we have separated the movements of 137Cs labeled sediments from the final distribution of the 14C labeled isomer. Further, we have determined the range of isomer concentration that seems to stress the more oligotrophic Stylodrilus. We do not yet know this range for Limnodrilus."
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        {
            "spans": [
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            "content": "Secondly, the above results have allowed us to produce a design for a series of more closely controlled experiments on the redistribution, net accumulation and uptake kinetics of PCBs by these two dominant aquatic oligochaetes. At this point we have redesigned and are rebuilding the microcosms for two sets of experiments to begin around the first of April when fresh collections of oligochaetes will be available from Lake Michigan."
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            "content": "9. Products: Two products have come from the research thus far. The first is a manuscript on the PCB-Stylodrilus preliminary experiment which will be submitted for review and possible publication this spring. The second is a dissertation proposal by T. Keilty who will use much of the data generated here for his doctoral research."
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            "content": "49"
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            "content": "PROGRESS REPORT"
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            "content": "April, 1983"
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            "content": "1. Organization: Great Lakes Environmental Research Laboratory NOAA"
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            "content": "2300 Washtenaw Avenue Ann Arbor, Michigan 48104"
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            "content": "2. Principal Investigator: John P. Giesy"
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            "content": "3. Amount of 1983 Funds: $17,484"
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            "content": "4. Total Projects Funds to Date: $17,484"
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            "content": "5. Title: Changes in the Free Amino Acid Pool of Benthic Invertebrates as a Sublethal Toxic Response to Pentachlorophenol"
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            "content": "6. Project Summary:"
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            "content": "The objective of this project is to develop non-specific biochemical measures of chemically induced sublethal, chronic stress in benthic organisms from the Great Lakes. Initially we will be examining the response of the free amino acid pools and glycogen concentrations of the amphipod Gammarus fasciatus and the annelid, Stylodrilus heringianus. We are examining the seasonal and spatial variability of the FAA in samples of these species from the Great Lakes as well as changes due to exposure to pentachlorophenol in laboratory studies."
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            "content": "7. Status:"
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            "content": "Our initial efforts have been to design our test protocols for the entire study period. This has been completed as a complete study protocol presented to the study group. These protocols were discussed at our last meeting and several areas of interaction with other projects developed."
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            "content": "We have made several collecting trips out on the lakes during the past year and have developed our laboratory rearing techniques."
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            "content": "We have adapted several statistical techniques to be able to profile the relative concentrations of all of the individual amino acids in the FAA. Previous attempts to use the FAA pool as a measure of stress have met with limited"
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                        7.5461,
                        2.1075,
                        7.5593,
                        2.583,
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                }
            ],
            "content": "- X i, t + Dt' 2 1/2 (1)"
        },
        {
            "spans": [
                {
                    "offset": 75414,
                    "length": 6
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            ],
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                }
            ],
            "content": "where:"
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        {
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                    "length": 58
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                {
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            ],
            "content": "i represents each individual free amino acid concentration"
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        {
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                    "offset": 75480,
                    "length": 8
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            "content": "t = time"
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            "content": "At = change in time period"
        },
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            ],
            "content": "Monitoring the Euclidean distance will allow us to compare changes from the steady state homeostatic range. We will also be able to measure the resistance and resilience of populations of organisms."
        },
        {
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                {
                    "offset": 75715,
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            "content": "8. Since we have only been funded since January our primary product has been our experimental protocol and development of our rearing techniques."
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            "content": "51"
        },
        {
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                    "offset": 75864,
                    "length": 1
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            ],
            "boundingRegions": [
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            "content": "1"
        },
        {
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            ],
            "content": "(A )"
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            "content": "(B) } Steady State"
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            "content": "S"
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            "content": "E. D. (FAA )"
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            "content": "1"
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            "content": "(C )"
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            "content": "2"
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            "content": "4"
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            "content": "6"
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            "content": "7"
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            "content": "12"
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            "content": "14"
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            "content": "16"
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            "content": "Time (wks. )"
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            "content": "FIGURE 2"
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            ],
            "content": "Hypothetical example of how Euclidean Distances (E.D.) may fluctuate in organisms under stress. B - normal operating range or steady state conditions, A and C - two potential patterns for organisms under stress."
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            "content": "52"
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            "content": "Semi-Annual Project Report"
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            "content": "April 1983"
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            "content": "1. Principal Investigator: Dr. Steven J. Eisenreich"
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            ],
            "content": "2. Affiliation: Environmental Engineering Program Department of Civil and Mineral Engineering University of Minnesota Minneapolis, MN 55455"
        },
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            ],
            "content": "."
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        {
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            "content": "3. Amount of 1981 funds: $40,000"
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            "content": "4. Total project funds through 1982: $73,000"
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            "content": "5. Title: Toxic Organic-Sediment Dynamics in the Great Lakes"
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            "content": "6. Project Summary: The overall objective of this research project is to examine the processes responsible for the accumulation, transformations and movement of toxic organics in the sediments of the Great Lakes. To this end, detailed sediment cores obtained with an oceanographic box corer and benthos corer from high and low sedimentation regions of each of the Great Lakes will be carefully examined for stratigraphic variations in concentration and transformed species of initially selected chlorinated hydrocarbons. Initial studies will emphasize PCBs, DDT-group compounds, lindane, and 3 to 4 additional compounds selected on the basis of occurrence in the core and known preference for sediment (i. e., compounds having a range of Kow, Koc, etc. )"
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            ],
            "content": "The diagenesis of PCBs in each core will be examined by careful analysis for up to 30 PCB isomers. Over depth increments in high sedimentation regions corre- sponding to periods of constant input, in situ degradation/transformation rates may be obtained."
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            "content": "Pore water isolated from depth intervals of box cores will be analyzed for organics above and PAHs to evaluate the importance of diffusion/advection of hydrophobic pollutants to overlying water."
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            "content": "7. Status: The project to date is on schedule. The project was begun in 1981, with an intensive sampling trip on the Great Lakes. Box cores were obtained in high and low sedimentary regions of Lakes Erie and Huron and by benthos coring in Lake Michigan. Box cores were divided into as many as 16 sub-cores, two of which from each site were dedicated to this project. In all, eight box core splits, nine benthos cores and two sub-cores from Lake Ontario (courtesy of CCIW, Dr. Bourbonniere) were collected. Each core was sectioned into 1 cm depth intervals in the uppermost 20 cm, and every 2 cm thereafter. Sectioned cores were stored frozen until analysis."
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            "content": "53"
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            ],
            "content": "The distribution of Mirex and total PCBs are shown in Figure 1 for the Lake Ontario high sed core. The dashed lines in each case are distributions computed using the steady state mixing model and annual U. S. production figures for the source function. In the case of Mirex there may be a strong regional source. Apparently a major quantity of the compound was introduced into a tributary to western Lake Ontario and this pulse reached the mouth around 1963. Shown in Figure 1 as the solid line is the distribution expected to result from a slug of . Mirex deposited in 1970. There is roughly a seven-year difference between the optional model date the estimated time of introduction. The difference is worth :"
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            ],
            "content": "following as it may be important for understanding in-lake processes: some explanations worth considering include: predominance of other more distributed sources, delay in appearance of signal at the offshore location, processes of external integration of the signal as a competitor to local integration (mixing)."
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            ],
            "content": "In the case of the PCBs little relation is expected between annual production numbers and profiles. Distributions of individual isomers generally have an appearance similar to the total PCB profile but ratios of specific isomers to total PCBs group systematically. The four chlorinated isomers generally have ratios which decrease less with increasing sediment depth than to the five chlorinated isomers. Similarly, the six chlorinated isomers decrease more rapidly than their five chlorinated counterparts. This behavior is interpreted as due to a higher postdepositional mobility of the lower chlorinated species (S. Eisenreich). Evidently modelling the behavior of these compounds in sediments will require the use of diffusion/advection models with isomer-dependent parameter values."
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            "content": "54"
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            "content": "CONCENTRATION (ng/g )"
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            "content": "CONCENTRATION (ng /g )"
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            "content": "O"
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                    "offset": 80266,
                    "length": 3
                }
            ],
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                }
            ],
            "content": "200"
        },
        {
            "spans": [
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                    "offset": 80270,
                    "length": 3
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            ],
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                }
            ],
            "content": "400"
        },
        {
            "spans": [
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                    "length": 1
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                        1.1166
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                }
            ],
            "content": "O"
        },
        {
            "spans": [
                {
                    "offset": 80276,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                }
            ],
            "content": "20"
        },
        {
            "spans": [
                {
                    "offset": 80279,
                    "length": 2
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                }
            ],
            "content": "40"
        },
        {
            "spans": [
                {
                    "offset": 80282,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                        0.9681,
                        6.7394,
                        1.1022,
                        6.5285,
                        1.1022
                    ]
                }
            ],
            "content": "60"
        },
        {
            "spans": [
                {
                    "offset": 80285,
                    "length": 4
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                        1.0639,
                        7.7316,
                        1.2221,
                        7.3146,
                        1.2221
                    ]
                }
            ],
            "content": "1980"
        },
        {
            "spans": [
                {
                    "offset": 80290,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
                        1.021,
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                        1.1408,
                        1.1454,
                        1.1408,
                        1.27,
                        1.021,
                        1.27
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                }
            ],
            "content": "O"
        },
        {
            "spans": [
                {
                    "offset": 80292,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
                        1.1887,
                        1.6438,
                        1.2846,
                        1.6438,
                        1.2846,
                        1.7157,
                        1.1887,
                        1.7157
                    ]
                }
            ],
            "content": "1"
        },
        {
            "spans": [
                {
                    "offset": 80294,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
                        7.1612,
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                        7.2666,
                        1.7924,
                        7.2666,
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                        7.1612,
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                }
            ],
            "content": "-"
        },
        {
            "spans": [
                {
                    "offset": 80296,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
                        7.3146,
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                        1.7732,
                        7.7172,
                        1.9217,
                        7.3146,
                        1.9217
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                }
            ],
            "content": "1970"
        },
        {
            "spans": [
                {
                    "offset": 80301,
                    "length": 29
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            ],
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                    "pageNumber": 60,
                    "polygon": [
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                        0.8819,
                        2.1879,
                        0.9107,
                        4.8956,
                        0.6998,
                        4.8978
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                }
            ],
            "content": "CUMULATIVE DRY WEIGHT (g/cm2)"
        },
        {
            "spans": [
                {
                    "offset": 80331,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                        2.7558,
                        1.1623,
                        2.7462
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                }
            ],
            "content": "1"
        },
        {
            "spans": [
                {
                    "offset": 80333,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                        7.7364,
                        2.5064,
                        7.7364,
                        2.6694,
                        7.3194,
                        2.6694
                    ]
                }
            ],
            "content": "1960"
        },
        {
            "spans": [
                {
                    "offset": 80338,
                    "length": 1
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
                        1.021,
                        3.1582,
                        1.1312,
                        3.1582,
                        1.1312,
                        3.2876,
                        1.021,
                        3.2876
                    ]
                }
            ],
            "content": "2"
        },
        {
            "spans": [
                {
                    "offset": 80340,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
                        7.3307,
                        3.278,
                        7.743,
                        3.2828,
                        7.7412,
                        3.4361,
                        7.329,
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                    ]
                }
            ],
            "content": "1950"
        },
        {
            "spans": [
                {
                    "offset": 80345,
                    "length": 11
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                        8.024,
                        4.0504,
                        7.8418,
                        4.0496
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                }
            ],
            "content": "YEAR (A.D.)"
        },
        {
            "spans": [
                {
                    "offset": 80357,
                    "length": 10
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                }
            ],
            "content": "TOTAL PCBs"
        },
        {
            "spans": [
                {
                    "offset": 80368,
                    "length": 11
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                    ]
                }
            ],
            "content": "TOTAL MIREX"
        },
        {
            "spans": [
                {
                    "offset": 80380,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                        7.746,
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                    ]
                }
            ],
            "content": "1940"
        },
        {
            "spans": [
                {
                    "offset": 80385,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                        4.1838,
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                        4.3132
                    ]
                }
            ],
            "content": "3"
        },
        {
            "spans": [
                {
                    "offset": 80387,
                    "length": 4
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                        4.7109,
                        7.746,
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                        4.8691
                    ]
                }
            ],
            "content": "1930"
        },
        {
            "spans": [
                {
                    "offset": 80392,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                }
            ],
            "content": "4"
        },
        {
            "spans": [
                {
                    "offset": 80394,
                    "length": 4
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
                    "polygon": [
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                        5.5879,
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                    ]
                }
            ],
            "content": "1920"
        },
        {
            "spans": [
                {
                    "offset": 80399,
                    "length": 539
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 60,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Figure 1. Distribution of mirex and total PCBs in the Lake Ontario cores. The dashed line in each case is the distribution predicted from total sales figures for the compounds. The solid curve for mirex is the distribution expected for a pulse entering the lake around 1970. As the PCBs show sediment degradation rates or mobility which depend on isomeric composition, any relation between sediment profiles and production figures must be considered fortuitous. Distribution of PCBs will ultimately be treated in terms of specific isomers."
        },
        {
            "spans": [
                {
                    "offset": 80939,
                    "length": 2
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 60,
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                    ]
                }
            ],
            "content": "55"
        },
        {
            "spans": [
                {
                    "offset": 80942,
                    "length": 26
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "PROGRESS REPORT April 1983"
        },
        {
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                    "offset": 80969,
                    "length": 117
                }
            ],
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                    "pageNumber": 61,
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                }
            ],
            "content": "1. Organization: Radiological and Environmental Research Division Argonne National Laboratory Argonne, Illinois 60439"
        },
        {
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                {
                    "offset": 81087,
                    "length": 43
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            ],
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                }
            ],
            "content": "2. Principle Investigator: Donald M. Nelson"
        },
        {
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                    "offset": 81131,
                    "length": 30
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            ],
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                }
            ],
            "content": "3. Amount of 1983 Funds: $20 K"
        },
        {
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                    "offset": 81162,
                    "length": 37
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            ],
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                    ]
                }
            ],
            "content": "4. Total Project Funds to Date: $20 K"
        },
        {
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                {
                    "offset": 81200,
                    "length": 69
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            ],
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                }
            ],
            "content": "5. Title: Removal of Radionuclides from Watersheds of the Great Lakes"
        },
        {
            "spans": [
                {
                    "offset": 81270,
                    "length": 268
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "6. Project Summary: The objective of this research is to measure the transport of the fallout radionuclides 90Sr, 137Cs, and 239Pu into the Great Lakes via rivers. This information is needed as input to models describing the cycling of these elements within the lakes."
        },
        {
            "spans": [
                {
                    "offset": 81539,
                    "length": 72
                }
            ],
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                }
            ],
            "content": "7. Status : Four rivers draining into Lake Michigan have been chosen for"
        },
        {
            "spans": [
                {
                    "offset": 81612,
                    "length": 947
                }
            ],
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                }
            ],
            "content": "study: Manistee, Menomonee, Grand, and St. Joseph. These are to be sampled four times during the year. The first two samplings were completed in early November and early February. Sample analyses from November are nearly complete and these results are presented in Table 1. Also presented for comparison are typical values for Lake Michigan. In each instance the river concentrations are comparable to, or lower than, corresponding lake concentrations. The highest concentrations are, in general, associated with the Menomonee River and probably reflect the paucity of exchangeable cations in its watershed as well as the elevated concentrations of dissolved organic carbon (and hence natural complexing ligands) in the water. These initial findings are consistent with our supposition that rivers are not major sources of these radionuclides to the Great Lakes. No obstacles are foreseen which would interfere with the completion of this project."
        },
        {
            "spans": [
                {
                    "offset": 82560,
                    "length": 15
                }
            ],
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            ],
            "content": "8. References :"
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                    "length": 13
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            ],
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            ],
            "content": "9. Products :"
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                    "offset": 82590,
                    "length": 2
                }
            ],
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                        4.1831,
                        10.3207
                    ]
                }
            ],
            "content": "56"
        },
        {
            "spans": [
                {
                    "offset": 82593,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "\u0647"
        },
        {
            "spans": [
                {
                    "offset": 82595,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "polygon": [
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                        8.564,
                        0.7426
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                }
            ],
            "content": "3"
        },
        {
            "spans": [
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                    "length": 7
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            "content": "Table 1"
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            ],
            "content": "239Pu"
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            ],
            "content": "137Cs"
        },
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                }
            ],
            "content": "90gr"
        },
        {
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                    "offset": 82622,
                    "length": 2
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            "content": "pH"
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                }
            ],
            "content": "Conductivity u mohs/cm"
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                }
            ],
            "content": "Alkalinity mg/L"
        },
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                }
            ],
            "content": "DOC ppm"
        },
        {
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            "content": "Lake Michigan"
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            "content": "5 800"
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            "content": "nc = not completed."
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            "content": "11"
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            "content": "PROGRESS REPORT"
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            "content": "APRIL, 1983"
        },
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            "content": "A"
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            "content": "="
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        {
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                    "length": 77
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            "content": "1. Organization: Oak Ridge National Laboratory P.O. Box X Oak Ridge, TN 37830"
        },
        {
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            ],
            "content": "2. Principal Investigator: James E. Breck"
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            ],
            "content": "3. Amount of 1983 Funds: $40 K"
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            ],
            "content": "4. Total Project Funds to Date: $40 K"
        },
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            ],
            "content": "5. Title: Models for the Behavior and Fate of Long-lived Contaminants in the Upper Trophic Levels of the Great Lakes"
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        {
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            "content": "6. Project Summary: The objective of this project is to develop and analyze models for simulating contaminant concentrations in Great Lakes fishes; this will include an evaluation of the relative contributions of direct uptake from water, pelagic food chain pathways, and benthic food chain pathways. Initial work has focused on simulating the accumulation of PCBs by alewives, the dominant forage fish in Lake Michigan, using a bioenergetics modeling approach."
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            "content": "7. Status: Progress has been made in several areas of this project since it was initiated approximately six months ago. First, a bioenergetics model in FORTRAN was modified to permit simulation of PCB accumulation by alewives from water and from multiple prey types (Mysis, Pontoporeia, copepods, and cladocerans), and preliminary simulation results were obtained. These preliminary results are very encouraging, since the simulated PCB concen- trations in the first few years of life are very close to the observed PCB concentrations in Lake Michigan alewives (approximately 1-5 ppm). These initial results indicate that the trophic uptake pathway is more important for PCB uptake than direct uptake from the water; the food chain pathway contributes more than 80% of the total PCBs accumulated by alewives. This can be seen in the accompanying figure, which shows the relative contri- butions of water and several prey types to the PCBs accumulated by alewives (the effects of spawning are incorporated, as discussed below). More than half of the total PCBs in alewives is estimated to have come from the benthic amphipod Pontoporeia, suggesting that the benthic food chain that includes Pontoporeia is of major importance to the bioaccumulation of PCBs by Lake Michigan alewives, and consequently, by their salmonid predators."
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            "content": "="
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            "content": "Second, information on PCB concentrations in Lake Michigan alewives and invertebrates is being compiled from several published and unpublished sources. Jim St. Amant (Wisconsin Department of Natural Resources) has provided a computer listing of the PCB data for Lake Michigan fishes that the WDNR has collected from 1976 through 1982. An initial list of 61 values of PCBs in Lake Michigan alewives includes these data."
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            "content": "Third, discussions were held in Madison, Wisconsin, with people working on growth models for alewives (Drs. James F. Kitchell and Steve Hewett, both of the Center for Limnology, University of Wisconsin-Madison) and with others collecting data on contaminant accumulation by fishes (Dr. Jack Sullivan, State Hygiene Lab and Department of Water Chemistry, University of Wisconsin; also Mr. Lee Liebenstein and Mr. Jim St. Amant, Wisconsin"
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            "content": "58"
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            "content": "Department of Natural Resources). A visit was also made to NOAA/GLERL in Ann Arbor, Michigan, to discuss this research project with GLERL staff members, to present initial results, and to foster closer integration of this modeling effort with other parts of the toxics program."
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            "content": "Fourth, spawning has recently been implemented in the bioaccumulation model to account for this loss of biomass and contaminants. Simulations have been done in which spawning losses are 10.3% of the female body weight (Norden, 1967). Accounting for spawning losses has several effects on simulated PCB concentration in alewives. Since simulated alewives must now consume more food in order to match the observed weight at age, there is an increase in prey consumption. This leads to an increase in the importance of the food chain pathway relative to direct upatke from the water, and a slight increase in the benthic food chain pathway relative to the pelagic food chain pathway."
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            "content": "The most significant aspect of spawning in these initial simulations is that spawning provides a mechanism for loss of contaminants from fish. This is especially important for PCBs in fish since other workers have recently shown that depuration rates of the more highly chlorinated PCBs are extremely low, approaching zero. The accompanying figure shows the effect on alewife PCB concentration of different values of the ratio of PCB concentration in the spawned eggs / whole-body PCB concentration; ratio values used were 0, 0.5, 1.0, and 1.5. When the ratio is less than 1.0 there is an increase in alewife PCB concentration after spawning, since the remaining body burden of contaminants is then concentrated in a smaller biomass. Ratios of .5 - 1.5, which are more realistic (Niimi, in press), all lead to lower estimates of PCBs in alewives than do simulations which do not have spawning. As can be seen in the accom- panying figure, consideration of spawning losses of contaminants is especially important for estimating contaminant concentrations in older fish, and spawning may be a dominant loss mechanism for long-lived fish species such as lake trout."
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            "content": "8. References :"
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            ],
            "content": "Norden, C. R. (1967) Age, Growth and Fecundity of the Alewife, Alosa pseudoharengus (Wilson), in Lake Michigan. Trans. Am. Fish. Soc. 96: 387-393."
        },
        {
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            ],
            "content": "Niimi, A. J. Biological and Toxicological Effects of Environmental Contaminants in Fish and their Eggs. Can. J. Fish. Aquat. Sci. (in press)."
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            "content": "9. Products: none yet."
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            "content": "59"
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            "content": "6"
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            "content": "PERCENT OF ALEWIFE PCB FROM WATER & EACH PREY TYPE. SPAWNING LOSSES ARE INCLUDED, BUT NO LONG-TERM ELIN."
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