Item talk:Q257879
From geokb
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"name": "Determination of \u03b418O and \u03b415N in Nitrate",
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"abstract": "The analyses of both O and N isotopic compositions of nitrate have many potential applications in studies of nitrate sources and reactions in hydrology, oceanography, and atmospheric chemistry, but simple and precise methods for these analyses have yet to be developed. Testing of a new method involving reaction of potassium nitrate with catalyzed graphite (C + Pd + Au) at 520 \u00b0C resulted in quantitative recovery of N and O from nitrate as free CO2, K2CO3, and N2. The \u03b418O values of nitrate reference materials were obtained by analyzing both the CO2 and K2CO3 from catalyzed graphite combustion. Provisional values of \u03b418OVSMOW for the internationally distributed KNO3 reference materials IAEA-N3 and USGS-32 were both equal to +22.7 \u00b1 0.5\u2030. Because the fraction of free CO2 and the isotopic fractionation factor between CO2 and K2CO3 were constant in the combustion products, the \u03b418O value of KNO3 could be calculated from measurements of the \u03b418O of free CO2. Thus, \u03b418OKNO3 = a\u03b418Ofree\u2009CO2 \u2212 b, where a and b were equal to 0.9967 and 3.3, respectively, for the specific conditions of the experiments. The catalyzed graphite combustion method can be used to determine \u03b418O of KNO3 from measurements of \u03b418O of free CO2 with reproducibility on the order of \u00b10.2\u2030 or better if local reference materials are prepared and analyzed with the samples. Reproducibility of \u03b415N was \u00b10.1\u2030 after trace amounts of CO were removed.",
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