演題概要

3C-O1-0951

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JAXAキュレーション施設の汚染評価における金属元素定量方法の立ち上げ

(¹JAXA・ ²マリンワーク)
^o中野有紗¹・ 深井稜汰¹・ 人見勇矢²・ 西村征洋¹

Extraterrestrial rock samples collected by sample return missions, such as Hayabusa and Hayabusa 2, are stored at the Extraterrestrial Sample Curation Center (ESCuC) at JAXA. These samples are processed in Nitrogen-circulation-type clean chambers (CCs) installed in Class 6 clean rooms (CRs) to prevent the contamination of the Earth’s materials. Environmental monitoring has been continuously conducted in the CRs and CCs, with analysis outsourced. However, due to scheduling and cost issues, sampling and analysis were limited to once or twice a year. To address this issue, we are establishing in-house environmental monitoring method with an ICP-MS/MS (Agilent 8900) and a Gas Exchange Device (GED; IAS Inc.), installed in the Class 7 CR for metal element analysis. Here we present the method for quantifying abundance of environmental metal elements in the ESCuC. Airborne particles in the CRs are collected in ultrapure water by the impinger method and particles deposited in the CRs/CCs are collected on the surface of quartz glass by the wafer exposure method. Furthermore, GED enables the direct introduction of atmosphere into ICP-MS, allowing for the analysis of suspended particles in gas samples. This method using GED-ICP-MS/MS facilitates the monitoring of the environment in both CCs and CRs.