[H-TT23] [JJ] 環境トレーサビリティー手法の開発と適用

[HTT23-07] Measurement technique of the nitrogen isotope ratio of NOx collected by the filter-pack method and its application.

村田 恵理子²、*木庭 啓介¹、渡邊 未来³、矢野 翠¹、高橋 晃子³、仁科 一哉³、高津 文人³、眞壁 明子⁴、竹中 千里⁵、楊 宗興² (1.京都大学生態学研究センター、2.東京農工大学、3.国立環境研究所、4.海洋研究開発機構、5.名古屋大学)

キーワード：窒素同位体比、NOガス、脱窒菌法

NOx (NO and NO2) is quite important in atmospheric chemistry as well as in the biogeochemistry. Although natural abundance of stable nitrogen isotope is a promising tool for the the investigation of NOx dynamics in the enviornments, nitrogen isotopic measurement of NOx is quite difficult due to its high reactivity. We combine the filter-pack method (Watanabe et al. 2006) to capture NOx with the denitrifier method (Sigman et al. 2001) to measure nitrogen isotopic signature of NOx in the actual enviornments.. We found that the filter-pack method can be applied for atmospheric NOx samples including the soil-emitted NOx. We present our preliminary data obtained from the field and discuss the limitation and possibility of our filter-pack method in the presentation.