京都大学生態学研究センターCenter for Ecological Research, Kyoto University ◇ 520–2113 滋賀県大津市平野2–509–3 ◇ 2–509–3 Hirano, Otsu, Shiga Pref. 520–2113, Japan
窒素安定同位体比は複雑な窒素循環の解析に長年使われてきたが，必要試料量が大きいことがその利用のネックであった。近年，同位体比測定をN2ガスではなくN2Oガスで行う測定法が開発され，特に環境中で微量にしか存在しない溶存態の微量窒素化合物についての窒素安定同位体比，さらに酸素安定同位体比を用いた研究が進んできている。本稿ではこの測定法を用いた最新の研究について紹介する。
Recent developments of isotopic measurement with emphasis on N2O as the final analyte instead of N2, can provide great opportunities for scientists to measure δ15N and δ18O of nitrogen compounds. The unique characteristics of N2O such as its low atmospheric concentration, can allow us to measure δ15N and δ18O with only 20 nmol-N for nitrate. Moreover, this method is not only for nitrate and can be applicable as long as the target nitrogen compound, such as ammonium, nitrite, and dissolved organic nitrogen can be converted into N2O. In this review, I introduce the applications of this method to investigate the complex dynamics of nitrogen in the environments.
Key words: Nitrogen isotope; Oxygen isotope; nitrous oxide
© 2017 公益社団法人日本アイソトープ協会© 2017 Japan Radioisotope Association
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