天然および人工起源メタンの炭素同位体比測定  [in Japanese] Carbon isotope measurement of natural and anthropogenic methane  [in Japanese]

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Author(s)

    • 佐野 有司 [他] SANO Yuji
    • 広島大学理学部地球惑星システム学科 Department of Earth and Planetary Science, Faculty of Science, Hiroshima University
    • 増田 昌彦 MASUDA Masahiko
    • 広島大学理学部地球惑星システム学科:(現)コニカ株式会社 Department of Earth and Planetary Science, Faculty of Science, Hiroshima University: (Present address) Konica Corporation
    • 高畑 直人 TAKAHATA Naoto
    • 広島大学理学部地球惑星システム学科 Department of Earth and Planetary Science, Faculty of Science, Hiroshima University
    • 脇田 宏 WAKITA Hiroshi
    • 東京大学理学部地殻化学実験施設 Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo
    • 曽 毅強 ZENG Yiqiang
    • 国立環境研究所地球環境研究グループ Global Environment Division, The National Institute for Environmental Studies
    • 野尻 幸宏 NOJIRI Yukihiro
    • 国立環境研究所地球環境研究グループ Global Environment Division, The National Institute for Environmental Studies
    • 向井 人史 MUKAI Hitoshi
    • 国立環境研究所地球環境研究グループ Global Environment Division, The National Institute for Environmental Studies
    • 坂東 博 BANDO Hiroshi
    • 国立環境研究所地球環境研究グループ Global Environment Division, The National Institute for Environmental Studies

Abstract

We have collected various kinds of gas samples, which are expected to be source of atmospheric methane. Chemical compositions and δ<sup>13</sup>C values of the gas samples were measured by using a gas chromatograph and a combined gas chromatograph/combustion/isotope ratio mass spectrometer (GC/C/IRMS ) system, respectively. Analytical precision of δ<sup>13</sup>C value measurement by using GC/C/IRMS system was examined. Overall error of measurement is between 1 ‰ and 2 ‰, estimated from repeated analysis of running standard gas and δ<sup>13</sup>C variation with the combustion efficiency. Observed δ<sup>13</sup>C values of the methane vary singificantly from -65.2‰ to -22.9‰, agrees well with data from literatures. Taking into account a positive correlation between <sup>3</sup>He/<sup>4</sup>He ratios and δ<sup>13</sup>C values and a recent trend of atmospheric <sup>3</sup>He/<sup>4</sup>He ratio, we discuss contribution of fossil fuel methane to the increase of atmospheric methane.

Journal

  • Chikyukagaku

    Chikyukagaku 26(2), 105-114, 1993

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679868
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    3803093
  • NDL Source Classification
    M032(環境科学・自然災害・防災科学--大気汚染)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  NII-ELS  J-STAGE 
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