2001 Fiscal Year Final Research Report Summary
AMS radiocarbon measurements of individual organic molecules : making preparative capillary GC system and its application to geochemical samples
| Project/Area Number |
10354009
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
地球化学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
KAWAMURA Kimitaka Hokkaido Univ., Inst. of Low Temp. Sci., Professor, 低温科学研究所, 教授 (70201449)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Toshio Nagoya Univ., Associate Professor, 年代測定試料研究センター, 助教授 (10135387)
SHIBATA Yasuyuki National Inst. for Environ, Studies, Director, 科学環境研究領域, 室長 (80154251)
NAKATUSKA Takeshi Hokkaido Univ., Inst. of Low Temp. Sci., Associate Professor, 低温科学研究所, 助教授 (60242880)
MATSUMOTO Kohei Hokkaido Univ., Inst. of Low Temp. Sci., Post Doctorial Fellow, 低温科学研究所, 学振特別研究院
YAMAGAMI Takashi Yokogawa Analytical Systems Inc., Manager, アプリケーション開発部・技術第1課, 係長(研究職)
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| Project Period (FY) |
1998 – 2001
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| Keywords | Radiocarbon / AMS / Chronology / Organic carbon age / Biomakers / Preparative GC / Aerosols / Geochemical samaples |
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| Research Abstract |
Compound-specific radiocarbon analysis of individual fatty acids was conducted for a semi-urban aerosol sample using a preparative capillary gas chromatography (PCGC) system and an accelerator mass spectrometry (AMS). The aerosol fatty acids (C16 to C34) showed a typical bimodal distribution with two maxima at C16 and C26. Their carbon isotopic compositions ranged from -30.3 ‰ (C26) to -23.3 ‰ (C18), suggesting that they are derived from terrestrial higher plants and marine sources. Radiocarbon measurements of C16-C22 fatty acids showed modern 14C ages, suggesting that the acids are emitted from living higher plants and possibly from marineorganisms. On the other hand, C24-C26 fatty acids that arecharacteristic to terrestrial plant waxes showed 14C ages of 5860 (EA200) years. This suggests that some portion of higher molecular weight fatty acids have been stored in geocnemical reservoirs such as soils at least for hundreds to thousands of years arid then emitted to the atmosphere. These aged fatty acids could be in part transported long distances from the Asian continent through the atmosphere.
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[Publications] M. Uchida, Y. Shibata, K. Kawamura, Y. Kumamoto, M. Yoneda, K, Ohkashi, N. Harada, M. Hirota, H. Mukai, A. Tanaka, M. Kusakabe, M. Morita: "Compound-specific radiocarbon ages of fatty acids from bathyal sediments in the western North Pacific"Radiocarbon. 43. 949-956 (2001)
Description
「研究成果報告書概要(欧文)」より
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