Precise Isotopic Measurements of Nitrogen at the Sub-Nanomole Level.

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  • TAKAHATA Naoto
    Department of Earth and Planetary Sciences, Faculty of Science, Hiroshima University
  • NISHIO Yoshiro
    Geological Institute, School of Science, The University of Tokyo
  • YOSHIDA Naohiro
    Institute for Hydrospheric-Atmospheric Sciences, Nagoya University
  • SANO Yuji
    Department of Earth and Planetary Sciences, Faculty of Science, Hiroshima University

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タイトル別名
  • Precise Isotopic Measurements of Nitrog

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A system for the isotopic measurement of nitrogen at the sub-nanomole level has been developed using a modified noble gas mass spectrometer, allowing 40Ar/36Ar, N2/40Ar, 4He/40Ar and C/N ratios as well as the δ15N value to be measured on one sample. Moreover, carbon dioxide can be collected for a δ13C measurement. The experimental details concerning the analytical system are presented here, including the nitrogen purification procedure and its performance. The analytical errors concerning the δ15N values and 28N2/40Ar ratios were estimated to be about 0.3‰ and 3‰ for actual samples. Using six basalt glasses, the ability of the instrument to make accurate nitrogen isotope measurements has been evaluated. The observed values of the nitrogen content, nitrogen isotopes and nitrogen/argon ratios are compatible with the data in the literature. The results of some basic experiments and the observation of basalt glasses demonstrate that the new system can be applied to measuring nitrogen isotopes in geochemical and environmental samples.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 14 (3), 485-491, 1998

    社団法人 日本分析化学会

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