Ohno Takeshi, Muramatsu Yasuyuki, Toyama Chiaki, Nakano Kazumi, Kakuta Shinichiro, Matsuzaki Hiroyuki
Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo, Japan.
Anal Sci. 2013;29(2):271-4. doi: 10.2116/analsci.29.271.
A method was developed for the determination of (129)I in soil samples that uses an ICP-MS equipped with an octopole reaction system. Oxygen was used as the reaction gas for reducing the background intensity of m/z 129, principally by (129)Xe(+). The contribution of polyatomic ions, such as (127)IH(2)(+), could be effectively corrected for by assuming a production ratio ((127)IH(2)(+)/(127)I(+) = 3 × 10(-8)). The measured (129)I/(127)I ratios in a NIST standard solution and Fukushima soil samples are consistent with the expected value within the analytical error. This method provides a powerful tool for investigating radioiodine contamination in Fukushima and elsewhere.
开发了一种用于测定土壤样品中¹²⁹I的方法，该方法使用配备八极杆反应系统的电感耦合等离子体质谱仪。使用氧气作为反应气体，主要通过¹²⁹Xe⁺来降低m/z 129的背景强度。通过假设生成比（¹²⁷IH₂⁺/¹²⁷I⁺ = 3×10⁻⁸），可以有效校正多原子离子（如¹²⁷IH₂⁺）的贡献。在分析误差范围内，NIST标准溶液和福岛土壤样品中测得的¹²⁹I/¹²⁷I比值与预期值一致。该方法为调查福岛及其他地区的放射性碘污染提供了有力工具。
