• 研究課題をさがす
  • 研究者をさがす
  • KAKENの使い方
  1. 課題ページに戻る

2015 年度 実施状況報告書

分子内同位体による新しい天然ガス起源推定法の開発

研究課題

研究課題/領域番号 15K17774
研究機関東京工業大学

研究代表者

ジルベルト アレキシー  東京工業大学, 地球生命研究所, 助教 (20726955)

研究期間 (年度) 2015-04-01 – 2017-03-31
キーワードアイソトプ
研究実績の概要

We developed and implemented a new system enabling the analysis of 13C/12C content for each carbon atom of propane and butanes (namely “intramolecular isotope composition”).
The apparatus has been used to analyse samples synthesized in the lab, simulating propane formation through abiotic (radical polymerization of CH4) and thermogenic (thermal degradation of organic matter) processes.
The results show that the intramolecular isotope composition of propane are different from the 2 different processes: while abiotic samples show a relatively homogeneous 13C distribution, thermogenic samples show a strong 13C depletion on the terminal C-atom position, consistent with models existing.
Moreover, the signature of synthesized abiotic samples fits perfectly that from abiotic sample from hydrothermal system Hakuba-Happo (Japan) reemphasizing the role of hydrothermal systems in abiotic production.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

Our progress so far fits perfectly the original objectives: developing the apparatus and starting the analysis of amples from different origins.
The apparatus now works very well and is able to determine intramolecular isotope composition of propane and butanes in one single injection, with high sensitivity and high precision (Gilbert et al. 2016, GCA).

We also started the analysis of samples from field (Hakuba-Happo, Japan; Apulian basin, Italy). Some of them will require more purification steps than expected but should be analyzed soon. We are a bit in advance regarding simulating processes reated to natural gas formation/consumption. We already started thermal degradation of organic matter as a proxy for thermogenic gas.

今後の研究の推進方策

We shall work on improving the purification steps for some specific natural gas samples, especially those contiaing high amount of carbon dioxide or methane.
We will develop a model based on kinetics and isotope fractionation factors to explain the data otined so far on abiotic samples,m both at the molecular and at the intramoledcular level.
An important step for this project will be to determine the fractionation factors for simulated sinks and sources of natural gas. We already started experiments to simulate abiotic formation. We will make culture experiments aiming at evaluating fractionation factors associated with propane degradation by microorganisms, both un der the presence and in the absence of oxygen.

The above-mentionned steps will help refining the determinants of intramolecular isotope composition of natural gas hydrocarbons, and our understanding ofthe sources and sinks of natural gas on Earth.

次年度使用額が生じた理由

I postponed to buy chemicals to conduct an experiment.

次年度使用額の使用計画

So I will do so this year FY2016.

  • 研究成果

    (10件)

すべて 2016 2015 その他

すべて 雑誌論文 (6件) (うち国際共著 6件、 査読あり 6件) 学会発表 (3件) (うち国際学会 3件、 招待講演 1件) 備考 (1件)

  • [雑誌論文] Measurement of natural carbon isotopic composition of acetone in human urine2016

    • 著者名/発表者名
      Keita Yamada, Kazuki Ohishi, Alexis Gilbert, Mai Akasaka, Naohiro Yoshida, Ryoko Yoshimura
    • 雑誌名

      Analytical and bioanalytical chemistry

      巻: 408 ページ: 1597-1607

    • DOI

      10.1007/s00216-015-9268-z

    • 査読あり / 国際共著
  • [雑誌論文] Measurement of position-specific 13C isotopic composition of propane at the nanomole level2016

    • 著者名/発表者名
      A. Gilbert, K. Suda, K. Yamada, Y. Ueno, N. Yoshida.
    • 雑誌名

      Geochimica et Cosmochimica Acta

      巻: 177 ページ: 205-216

    • DOI

      10.1016/j.gca.2016.01.017

    • 査読あり / 国際共著
  • [雑誌論文] Measurement of the intramolecular 13C isotope ratio of pyruvate in diet pills using HS-SPME-GC-Py-GC-C-IRMS2016

    • 著者名/発表者名
      T. Nimmanwudipong, A. Gilbert, K. Yamada, N. Yoshida.
    • 雑誌名

      Journal of Analytical and bioanalytical techniques

      巻: 7 ページ: 1-5

    • DOI

      x.doi.org/10.4172/2155-9872.1000293

    • 査読あり / 国際共著
  • [雑誌論文] Evaluation of an on-line pyrolysis system for the determination of site-specific isotope composition of short chain n-alkanes (C6-C12)2016

    • 著者名/発表者名
      A. Gilbert, K. Yamada, N. Yoshida
    • 雑誌名

      Talanta

      巻: 153 ページ: 158-162

    • DOI

      x.doi.org/10.4172/2155-9872.1000293

    • 査読あり / 国際共著
  • [雑誌論文] Position-Specific Isotope Analysis of Xanthines: A 13C Nuclear Magnetic Resonance Method to Determine the 13C Intramolecular Composition at Natural Abundance.2015

    • 著者名/発表者名
      D. G. Diomande, E. Martineau, A. Gilbert, P. Nun, A. Murata, K. Yamada, N. Watanabe, I. Tea, R. J. Robins, N. Yoshida, G. S. Remaud
    • 雑誌名

      Analytical Chemistry

      巻: 87 ページ: 6600-6606

    • DOI

      10.1021/acs.analchem.5b00559

    • 査読あり / 国際共著
  • [雑誌論文] Analytical method for simultaneous determination of bulk and intramolecular 13C isotope compositions of acetic acid2015

    • 著者名/発表者名
      T. Nimmanwudipong, A. Gilbert, K. Yamada, N. Yoshida.
    • 雑誌名

      Rapid Communications in Mass Spectrometry

      巻: 29 ページ: 2337-2340

    • DOI

      10.1002/rcm.7398

    • 査読あり / 国際共著
  • [学会発表] Abiogenesis of hydrocarbons revealed by position-specific isotope analysis2016

    • 著者名/発表者名
      Alexis Gilbert, Konomi Suda, Keita Yamada, Naohiro Yoshida, Yuichiro Ueno
    • 学会等名
      4th ELSI Symposium
    • 発表場所
      Tokyo Institute of Technology
    • 年月日
      2016-01-12 – 2016-01-16
    • 国際学会
  • [学会発表] An apparatus dedicated to the measurement of position-specific isotope compsition of natural gas component2015

    • 著者名/発表者名
      Alexis Gilbert, Konomi Suda, Keita Yamada, Naohiro Yoshida, Yuichiro Ueno
    • 学会等名
      3-rd International Workshop “Exploitation of Intramolecular Isotope Compositions and Emerging Techniques for their Measurement”
    • 発表場所
      Aix-en-Provence (France)
    • 年月日
      2015-10-05 – 2015-10-06
    • 国際学会 / 招待講演
  • [学会発表] Position-specific 13C isotope composition of non-methane hydrocarbons2015

    • 著者名/発表者名
      Alexis Gilbert, Konomi Suda, Keita Yamada, Naohiro Yoshida, Yuichiro Ueno
    • 学会等名
      Goldschmidt 2015
    • 発表場所
      Prague (Czech Republic)
    • 年月日
      2015-08-15 – 2015-08-20
    • 国際学会
  • [備考] Alexis Gilbert

    • URL

      http://www.elsi.jp/ja/research/member/researcher/assistant-professor/alexis-gilbert.html

URL: 

公開日: 2017-01-06  

サービス概要 検索マニュアル よくある質問 お知らせ 利用規程 科研費による研究の帰属

Powered by NII kakenhi