Measurement of iodine species and sulfuric acid using bromide chemical ionization mass spectrometers

Details

• Journal Title:
  Atmospheric Measurement Techniques
• Personal Author:
  Wang, Mingyi ; He, Xu-Cheng ; Finkenzeller, Henning ; Iyer, Siddharth ; Chen, Dexian ; Shen, Jiali ; Simon, Mario ; Hofbauer, Victoria ; Kirkby, Jasper ; Curtius, Joachim ; Maier, Norbert ; Kurtén, Theo ; Worsnop, Douglas R. ; Kulmala, Markku ; Rissanen, Matti ; Volkamer, Rainer ; Tham, Yee Jun ; Donahue, Neil M. ; Sipilä, Mikko
• NOAA Program & Office:
  CIRES (Cooperative Institute for Research in Environmental Sciences)
• Description:
  Iodine species are important in the marine atmosphere for oxidation and new-particle formation. Understanding iodine chemistry and iodine new-particle formation requires high time resolution, high sensitivity, and simultaneous measurements of many iodine species. Here, we describe the application of a bromide chemical ionization mass spectrometer (Br-CIMS) to this task. During the iodine oxidation experiments in the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber, we have measured gas-phase iodine species and sulfuric acid using two Br-CIMS, one coupled to a Multi-scheme chemical IONization inlet (Br-MION-CIMS) and the other to a Filter Inlet for Gasses and AEROsols inlet (Br-FIGAERO-CIMS). From offline calibrations and intercomparisons with other instruments, we have quantified the sensitivities of the Br-MION-CIMS to HOI, I2, and H2SO4 and obtained detection limits of 5.8 × 106, 3.8 × 105, and 2.0 × 105 molec. cm−3, respectively, for a 2 min integration time. From binding energy calculations, we estimate the detection limit for HIO3 to be 1.2 × 105 molec. cm−3, based on an assumption of maximum sensitivity. Detection limits in the Br-FIGAERO-CIMS are around 1 order of magnitude higher than those in the Br-MION-CIMS; for example, the detection limits for HOI and HIO3 are 3.3 × 107 and 5.1 × 106 molec. cm−3, respectively. Our comparisons of the performance of the MION inlet and the FIGAERO inlet show that bromide chemical ionization mass spectrometers using either atmospheric pressure or reduced pressure interfaces are well-matched to measuring iodine species and sulfuric acid in marine environments.
• Source:
  Atmospheric Measurement Techniques, 14(6), 4187-4202
• DOI:
  https://doi.org/10.5194/amt-14-4187-2021
• ISSN:
  1867-8548
• Format:
  pdf
• Publisher:
  Copernicus GmbH
• Document Type:
  Journal Article
• License:
  https://creativecommons.org/licenses/by/4.0/
• Rights Information:
  CC BY
• Compliance:
  Library
• Main Document Checksum:
  urn:sha-512:9f7c2ca1e49e95072e27cc585ed7eb557bbee34e78c622387bcde1699046fabc7db80c626bc595175ff871f23618758b7f784a2418bcc2cb1f341aa63249b130
• Download URL:
  https://repository.library.noaa.gov/view/noaa/69748/noaa_69748_DS1.pdf
• File Type:
  [PDF - 1.85 MB ]