High-precision quadruple isotope dilution method for simultaneous determination of nitrite and nitrate in seawater by GCMS after derivatization with triethyloxonium tetrafluoroborate

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DOIResolve DOI: http://doi.org/10.1016/j.aca.2014.03.018
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TypeArticle
Journal titleAnalytica Chimica Acta
ISSN0003-2670
Volume824
Pages3641; # of pages: 6
SubjectQuadruple isotope dilution; High-precision; Nitrite and nitrate; Seawater; Triethyloxonium tetrafluoroborate derivatization; GCMS
AbstractQuadruple isotope dilution mass spectrometry (ID4MS) has been applied for simultaneous determination of nitrite and nitrate in seawater. ID4MS allows high-precision measurements and entails the use of isotopic internal standards (18O-nitrite and 15N-nitrate). We include a tutorial on ID4MS outlining optimal experimental design which generates results with low uncertainties and obviates the need for direct (separate) evaluation of the procedural blank. Nitrite and nitrate detection was achieved using a headspace GCMS procedure based on single-step aqueous derivatization with triethyloxonium tetrafluoroborate at room temperature. In this paper the sample preparation was revised and fundamental aspects of this chemistry are presented. The proposed method has detection limits in the low parts-per-billion for both analytes, is reliable, precise, and has been validated using a seawater certified reference material (MOOS-2). Simplicity of the experimental design, low detection limits, and the use of quadruple isotope dilution makes the present method superior to the state-of-the-art for determination of nitrite and nitrate, and an ideal candidate for reference measurements of these analytes in seawater. © 2014.
Publication date
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number21272651
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Record identifier3b5c7676-ed16-441a-b6eb-e97f511965b4
Record created2014-12-03
Record modified2016-05-09
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