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Online solid-phase extraction-inductively coupled plasma-quadrupole mass spectrometry with oxygen dynamic reaction for quantification of technetium-99

テクネチウム-99分析のためのオンライン固相抽出-酸素リアクション-誘導結合プラズマ質量分析法

松枝 誠 ; 柳澤 華代*; 小荒井 一真 ; 寺島 元基 ; 藤原 健壮 ; 阿部 寛信 ; 北村 哲浩  ; 高貝 慶隆*

Matsueda, Makoto; Yanagisawa, Kayo*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Abe, Hironobu; Kitamura, Akihiro; Takagai, Yoshitaka*

多段階分離を用いた干渉物質($$^{99}$$Ru及び$$^{98}$$Mo)の除去を利用した完全自動のオンライン固相抽出ICP-MS分析法を開発した。$$^{99}$$TcのICP-MS分析では試料中に大過剰に含まれるMo由来の同重体(MoH)が定量を阻害するが、本法は$$^{99}$$Tc/Mo = 1.5$$times$$10$$^{-13}$$のアバンダンス比を得ており、ICP-MSの適用範囲を拡張した。検出下限値は50 mL導入で9.3pg/L、測定時間は24分であった。

Online solid-phase extraction-inductively coupled plasma-quadrupole mass spectrometry with oxygen dynamic reaction cell (online SPE-ICP-MS-DRC) was shown to be a thorough automatic analytical system, circumventing the need for human handling. At three stepwise separations (SPE-DRC-Q mass filters), we showed that interference materials allowed the coexistence of abundance ratios of 1.5$$times$$10$$^{-13}$$ for $$^{99}$$Tc/Mo. Using this optimized system, a detection limit of $$^{99}$$Tc was 9.3 pg/L (5.9 mBq/L) for a 50 mL injection and sequential measurements were undertaken at a cycle of 24 min/sample.

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