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Determination of 129I in Fukushima soil samples by ICP-MS with an octopole reaction system
Takeshi Ohno1, Yasuyuki Muramatsu, Chiaki Toyama
1Department of Chemistry, Faculty of Science, Gakushuin University, Tokyo, Japan. takeshi.ohno@gakushuin.ac.jp
Abstract:
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.
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