日本地球惑星科学連合2018年大会

講演情報

[JJ] Eveningポスター発表

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT18] 環境トレーサビリティー手法の開発と適用

2018年5月22日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:陀安 一郎(総合地球環境学研究所)、中野 孝教(大学共同利用機関法人 人間文化研究機構 総合地球環境学研究所)、木庭 啓介(京都大学生態学研究センター)

[HTT18-P11] 環境試料のマグネシウム同位体分析(II)

*SHIN Ki-Cheol1 (1.総合地球環境学研究所)

キーワード:Mg安定同位体、環境試料、RIHN-Mg

In this presentation, I discuss an updated result of magnesium isotopes analysis for various environmental samples. In the previous discussion (JpGU 2017 HTT23-P15), I explained the effective column separation method of magnesium from the diverse environmental samples. The tested one-step separation methods using different reagent solution successfully separated magnesium with a high recovery rate at least 98% or more. But the separated solution has still several matrix elements, such as Co, Ni, Cu, Zn, Rb, Ag, Cs. During isotopic analysis of the purified solution with MC-ICP-MS, the presence of these matrix elements more than a certain amount obviously caused a change in their isotope value. Those samples containing abundant specific element is necessary to pay attention to isotopic analysis.
In the measurement by MC-ICP-MS (ThermoScientific Neptune plus, Bremen, Germany), the magnesium isotope values are determined standard-sample-standard bracketing method. All data are presented as delta value deviation from DSM3 which is a standard international material for magnesium isotope, and the average of three measurements was summarized as a result. Since the DSM3 has depleted, a new working standard solution RIHN-Mg tested. The RIHN-Mg value has close to the DSM3 value, it could be replaced after run out of DSM3. To evaluate the confidence of the analysis several reference samples are tested and show good agreement of reported values.