Negative chemical ionization GC/MS determination of nitrite and nitrate in seawater using exact matching double spike isotope dilution and derivatization with triethyloxonium tetrafluoroborate

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DOIResolve DOI: http://doi.org/10.1021/ac2030128
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TypeArticle
Journal titleAnalytical Chemistry
ISSN0003-2700
1520-6882
Volume84
Issue5
Pages25922596; # of pages: 5
AbstractThe alkylation of nitrite and nitrate by triethyloxonium tetrafluoroborate allows determination of their ethyl esters by headspace GC–MS. In the present study, significant improvement in analytical performance are achieved by using negative chemical ionization (CI–). Detection limits are improved for at least an order of magnitude than those achieved using electron impact ionization (EI). The derivatization procedure has been optimized and alkaline conditions are adopted to minimize the conversion of nitrite to nitrate (determined to be 0.07% at 100 mg/L NO2–) and to avoid the exchange of oxygen between the analytes and the solvent (water). Quantitation entails the use of isotopically enriched standards (N18O2– and 15NO3–), which also permits monitoring of potential conversion from nitrite to nitrate during the analysis (double spike isotope dilution).
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21268854
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Record identifiere12d8c8e-0d51-41e9-9fc6-e8d7d3d3731f
Record created2013-11-15
Record modified2016-05-09
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