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Origin and behavior of atmospheric methane inferred from carbon isotopic analyses(I) : Preparation of air sample for carbon isotopic analyses
Bibliographic Information
- Other Title
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- 大気中メタンの炭素同位体比測定とその挙動解析(I): 微量メタンの濃縮・分離とその炭素同位体比測定
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Description
Carbon isotopic ratios give us useful information on the origin and behavior of atmospheric methane which contributes to the greenhouse effect. The concentration of methane in the atmosphere is too low to measure its carbon isotopic ratios without enrichment. We assemble a preparation line for the analyses of these ratios. This line enriches methane in air sample more than 1m^3 by adsorption under low temperature, and separates it from the other gas components with gas chromatography. The enriched methane is finally turned to carbon dioxide through the combustion tube in this line. The efficiency of methane collection with this line is examined using air sample and standard methane diluted with nitrogen, and it is more than 80% for the former sample and more than 90% for the latter one. The carbon isotopic ratios (^<14>C/^<13>C) in the latter two samples are 0.00512±0.00091 and 0.01184±0.00072. These ratios are almost the background level (0.00587±0.00004), and that shows the contamination with the atmospheric air of high ^<14>C/^<13>C ratio in this line is little and negligible.
Journal
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- 名古屋大学加速器質量分析計業績報告書
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名古屋大学加速器質量分析計業績報告書 4 77-84, 1993-03
名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会
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Details 詳細情報について
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- CRID
- 1390290699381132032
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- NII Article ID
- 110000475832
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- NII Book ID
- AN10305282
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- HANDLE
- 2237/13222
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- Text Lang
- ja
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- Article Type
- departmental bulletin paper
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- Data Source
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- JaLC
- IRDB
- CiNii Articles
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- Abstract License Flag
- Allowed