日本地球惑星科学連合2015年大会

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セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS26] 生物地球化学

2015年5月27日(水) 17:15 〜 18:00 104 (1F)

コンビーナ:*楊 宗興(東京農工大学)、柴田 英昭(北海道大学北方生物圏フィールド科学センター)、大河内 直彦(海洋研究開発機構)、山下 洋平(北海道大学 大学院地球環境科学研究院)、座長:山下 洋平(北海道大学 大学院地球環境科学研究院)

17:18 〜 17:21

[MIS26-P02] NOxの窒素安定同位体比測定技術の開発

ポスター講演3分口頭発表枠

*村田 恵理子1木庭 啓介1渡邊 未来2仁科 一哉2高津 文人2竹中 千里3 (1.東京農工大学大学院農学研究院、2.国立環境研究所、3.名古屋大学大学院生命農学研究科)

Estimation of the nitrogen loss as N2 and NOx from ecosystem is quite important to close the nitrogen budget. However, due to the high spatio-temporal variations of the nitrogen dynamics in soils does not allow us to investigate the production/consumption processes of these gaseous forms of nitrogen. Although natural abundance of stable isotope is considered to be able to use for the investigation of the N dynamics with respect to gaseous nitrogen losses, nitrogen isotopic measurement of NOx is quite difficult due to its high reactivity. Here we present our preliminary work on the nitrogen isotopic measurement of NOx gas with the filter-pack method (Watanabe et al. 2006) together with the denitrification method (Sigman et al. 2001). NO gas produced from NaNO2 with known nitrogen isotopic ratio via several chemical treatments, then the trapped NO as NO2- and NO3- ions were converted to N2O with denitirifer, then nitrogen isotopic signature was measured by GC-IRMS. We found that the filter-pack method can be applied for the nitrogen isotopic measurement. We applied this method to measure nitrogen isotopic signature of atmospheric NOx and present these data in the poster.