Simultaneous determination of total organic carbon and total nitrogen in waters by pyrolysis-gas chromatography-mass spectrometry |
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| Affiliation: | 1. Ifremer, Unité de recherche Ressources Marines, Centre Océanologique du Pacifique B.P. 7004, 98719 Taravao, French Polynesia;2. Ifremer, Unité de recherche Lagons, Ecosystèmes et Aquaculture Durable en Nouvelle Calédonie B.P. 2059, 98846 Nouméa, New Caledonia;3. Laboratoire Littoral, Environnement et Sociétés, UMR 6250 du CNRS-Université de La Rochelle, 2 Rue Olympe de Gouges, 17000 La Rochelle, France;4. Ifremer, UMR 5244 IHPE, UPVD, CNRS, Université de Montpellier, F-34095 Montpellier, France |
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| Abstract: | An apparatus with a pyrolysis unit, gas chromatograph and quadrupole mass spectrometer was assembled for the simultaneous determination of total organic carbon (TOC) and total nitrogen (TN) in waters. The mass numbers used for the determination of TOC and TN were m/e 44 (CO2+) and m/e 30 (NO+), respectively. The short-term stability (relative standard deviation) was 3.3% for TOC, and 5.0% for TN. The detection limits were 0.076 μg ml−1 for TOC and 1.3 μg ml−1 for TN. TOC and TN in water samples were determined by this method, and the results agreed well with those obtained by a combustion-infrared method for TOC and a combustion-coulometric method for TN. |
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