Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 70(4): 291-299 (2021)


元素分析計連結型安定同位体比質量分析計の簡易改造による微量試料炭素窒素安定同位体比測定Carbon and Nitrogen Isotope Analysis on Small Samples Using a Near-conventional EA-IRMS System

1京都大学生態学研究センターCenter for Ecological Research, Kyoto University

2滋賀県立大学環境科学部University of Shiga Prefecture

3三重大学生物資源学研究科Department of Sustainable Resource Sciences, Graduate School of Bioresources, Mie University

4近畿大学大学院農学研究科Graduate School of Agriculture, Kindai University

5京都大学大学院情報学研究科Graduate School of Informatics, Kyoto University

6海洋研究開発機構生物地球化学センターBiogeochemistry Research Center, Japan Agency for Marine-Earth Science and Technology

7岡山大学環境生命科学研究科Okayama University

8総合地球環境学研究所Research Institute for Humanity and Nature

受付日:2020年6月10日Received: June 10, 2020
受理日:2021年3月2日Accepted: March 2, 2021
発行日:2021年7月15日Published: July 15, 2021

微量試料での炭素窒素安定同位体比を測定可能とする連続フロー型元素分析計連結式安定同位体比質量分析計(EA-IRMS)への改良について検討を行った。通常使用されている反応管の口径を小さくするなどの簡易的な改良を実施することで,通常の約1/5の試料量(約6 µg窒素,10 µg炭素)で十分な精度と確度を得られることが明らかとなった。

Analysis of carbon and nitrogen isotope ratios are now popular among many study fields mainly due to the development of EA-IRMS. It is difficult to run the tiny samples or the samples with low carbon or nitrogen concentrations with the normal EA-IRMS setting. Here we introduce the modification of EA-IRMS for the tiny samples. The analytical system with the narrow oxidation and reduction tubes allows better peak shapes for carbon and nitrogen, which increases the sensitivity of EA-IRMS. This system is now available for the users in Center for Ecological Research, Kyoto University without any big troubles in the analysis. Because the modification introduced here is not so complicated and the users can also use the normal settings whenever required, many EA-IRMS users can apply this system relatively easily.

Key words: carbon isotope ratio; nitrogen isotope ratio; elemental analyzer-isotope ratio mass spectrometry (EA-IRMS); stable isotope analysis

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