Faculty of Symbiotic Systems Science, Cluster of Science and Technology, Fukushima University, 1 Kanayagawa, Fukushima, 960-1296, Japan.
Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, 10-2 Fukasaku, Miharu-machi, Tamura-gun, Fukushima, 963-7700, Japan.
Anal Sci. 2022 Nov;38(11):1371-1376. doi: 10.1007/s44211-022-00180-w. Epub 2022 Sep 13.
This paper presents a mass-spectrometric method for determining the radionuclide iodine-129 (I) from the significant amount of interference in inductively coupled plasma tandem quadrupole mass spectrometry (ICP-MS/MS) using a dynamic reaction cell passing a mixture gas of O and CO. Thus far, mass spectrometry analysis of trace amounts of I has been hampered by the presence of xenon-129 (Xe) and the formation of polyatomic ions from excess amounts of stable isotope I. In this study, flowing a mixture gas of O and CO into the dynamic reaction cell (Q2) successfully removed both Xe interference and polyatomic interference (IH) in the analysis of I in ICP-MS/MS. The resulting ratio of (background noise of m/z 129)/I was 4.6 × 10 ± 3.3 × 10, which enables the analysis of 10 mBq/L of I in the presence of 100 mg/L of stable I without chemical separation. The detection limit of this method was 0.73 mBq/L (= 0.11 ng/L) with an APEX-Q sample inlet desolvation device. For demonstration purposes, spike and recovery analysis of rainwater was performed, and good agreement between the spiked and recovered amounts was achieved.
本文提出了一种质谱方法，用于在电感耦合等离子体串联四级杆质谱（ICP-MS/MS）中，通过动态反应池通过 O 和 CO 的混合气体，从大量干扰物中测定放射性核素碘-129（I）。到目前为止，痕量 I 的质谱分析受到氙-129（Xe）的存在和过量稳定同位素 I 形成多原子离子的阻碍。在这项研究中，将 O 和 CO 的混合气体流入动态反应池（Q2），成功地消除了 Xe 干扰和 ICP-MS/MS 中 I 的多原子干扰（IH）。得到的（m/z 129 的背景噪声）/I 的比值为 4.6×10±3.3×10，这使得在存在 100mg/L 稳定 I 的情况下，能够分析 10 mBq/L 的 I，而无需进行化学分离。该方法的检测限为 0.73 mBq/L（=0.11ng/L），使用 APEX-Q 样品进样去溶剂化装置。为了演示目的，对雨水进行了加标和回收分析，加标和回收量之间取得了良好的一致性。
