Quantification of nitrite and nitrate in seawater by triethyloxonium tetrafluoroborate derivatization - Headspace SPME GC-MS

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DOIResolve DOI: http://doi.org/10.1016/j.talanta.2011.07.098
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TypeArticle
Journal titleTalanta
ISSN0039-9140
Volume85
Issue5
Pages25112516; # of pages: 6
SubjectCertified reference materials; Certified values; Chromatography-mass spectrometry; Derivatizations; Gas chromatography mass spectrometry; Headspace SPME; Headspaces; Instrumental detection; Internal standards; Isotopically enriched; Micromolar level; Nitrite; Simultaneous determinations; Tetrafluoroborates; Vapor generation; Isotopes; Mass spectrometry; Nitrates; Nitrogen oxides; Seawater; Water analysis; Gas chromatography
AbstractTriethyloxonium tetrafluoroborate derivatization combined with direct headspace (HS) or SPME-gas chromatography-mass spectrometry (GC-MS) is proposed here for the simultaneous determination of nitrite and nitrate in seawater at micromolar level after conversion to their corresponding volatile ethyl-esters (EtO-NO and EtO-NO2). Isotopically enriched nitrite [15N] and nitrate [15N] are employed as internal standards and for quantification purposes. HS-GC-MS provided instrumental detection limits of 0.07 μM NO2 - and 2 μM NO3 -. Validation of the methodology was achieved by determination of nitrite and nitrate in MOOS-1 (Seawater Certified Reference Material for Nutrients, NRC Canada), yielding results in excellent agreement with certified values. All critical aspects connected with the potential inter-conversion between nitrite and nitrate (less than 10%) were evaluated and corrected for by the use of the isotopically enriched internal standard. © 2011 Elsevier B.V. All rights reserved.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedYes
NPARC number21271615
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Record identifiere861c8de-40eb-4dcd-99a5-6d5481242b92
Record created2014-03-24
Record modified2016-05-09
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