Triple oxygen stable isotope analysis of nitrite measured using continuous flow isotope ratio mass spectrometry

Walters, Wendell W.; Hastings, Meredith G.

doi:10.1016/j.mex.2023.102413

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Triple oxygen stable isotope analysis of nitrite measured using continuous flow isotope ratio mass spectrometry

2023
By Walters, Wendell W. ; Hastings, Meredith G.
Source: MethodsX, 11, 102413

[PDF-1.12 MB]

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Journal Title:

MethodsX
Personal Author:

Walters, Wendell W. ; Hastings, Meredith G.

Walters, Wendell W. ; Hastings, Meredith G. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Oxygen stable isotopes (i.e., 16O, 17O, 18O) of nitrite (NO2−) are useful for investigating chemical processes and sources contributing to this important environmental contaminant and nutrient. However, it remains difficult to quantify the oxygen isotope compositions of NO2− due to the lack of internationally recognized NO2− reference materials with a well-known Δ(17O) value. Here we have adopted a combination of methodologies to develop a technique for measuring Δ(17O) of NO2− by reducing nitrate (NO3−) materials with internationally recognized Δ(17O) values to NO2− using activated cadmium catalyzed by chloride in a basic solution while conserving Δ(17O). The NO3− reference materials reduced to NO2− and sample NO2− unknowns are converted to N2O using sodium azide/acetic acid reagent and decomposed to O2 by passing through a heated gold tube and introduced into a continuous flow isotope ratio mass spectrometer for analysis at m/z 32, 33, and 34 for Δ(17O) quantification.
Keywords:

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Clinical Biochemistry Medical Laboratory Technology
Source:

MethodsX, 11, 102413
DOI:

https://doi.org/10.1016/j.mex.2023.102413
ISSN:

2215-0161
Format:

PDF
Publisher:

Elsevier BV
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310118
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
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CC BY-NC-ND
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urn:sha256:5de5d83466f94b3475c1bf45f589c737c7e1add8f10ff94686b77ff442a761ed
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https://repository.library.noaa.gov/view/noaa/59474/noaa_59474_DS1.pdf
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Triple oxygen stable isotope analysis of nitrite measured using continuous flow isotope ratio mass spectrometry

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