Evaluation of nitrogen-15 tracer techniques for direct measurement of denitrification in soil: III. Laboratory studies

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Abstract

Laboratory studies were conducted to evaluate the assumption of isotopic uniformity that underlies mass spectrometric determination of dinitrogen (N2) and nitrous oxide (N2O) evolved during denitrification in soil treated with 15N-labeled fertilizer. In these studies, a gas chromatograph (GC) and mass spectrometer (MS) were used to analyze replicate atmospheric samples containing N2O generated through oxidation of 15N-labeled NH2OH, evolved from 15N-treated soil slurries incubated at constant moisture content (1 kg H2Okg-1), or evolved from N-treated soil subjected to wetting and drying cycles. Both instruments gave almost identical values in analysis of N2O derived from a single pool of 15N-labeled NH2OH or from two pools having similar, but not necessarily the same, enrichments. The MS gave lower values for N2O derived from two pools differing markedly in their enrichment of 15N.

Original languageEnglish (US)
Pages (from-to)1327-1332
Number of pages6
JournalSoil Science Society of America Journal
Volume52
Issue number5
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Soil Science

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