DOI | Resolve DOI: https://doi.org/10.1016/j.talanta.2011.07.098 |
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Author | Search for: Pagliano, E.; Search for: Onor, M.; Search for: Pitzalis, E.; Search for: Mester, Z.1ORCID identifier: https://orcid.org/0000-0002-2377-2615; Search for: Sturgeon, R.E.1; Search for: D'Ulivo, A. |
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Affiliation | - National Research Council of Canada. NRC Institute for National Measurement Standards
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Format | Text, Article |
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Subject | certified 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 |
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Abstract | Triethyloxonium 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. |
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Publication date | 2011 |
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In | |
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Language | English |
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Peer reviewed | Yes |
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NPARC number | 21271615 |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | e861c8de-40eb-4dcd-99a5-6d5481242b92 |
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Record created | 2014-03-24 |
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Record modified | 2020-04-21 |
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