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Mass-spectrometric determination of iodine-129 using O$$_{2}$$-CO$$_{2}$$ mixed-gas reaction in inductively coupled plasma tandem quadrupole mass spectrometry

Matsueda, Makoto   ; Aoki, Jo; Koarai, Kazuma   ; Terashima, Motoki  ; Takagai, Yoshitaka*

The $$^{129}$$I analysis using ICP-MS is challenging caused by xenon-129 ($$^{129}$$Xe) and $$^{127}$$IH$$_{2}$$ generated from excess stable isotope $$^{127}$$I. In this study, mass discrimination between iodine-129 ($$^{129}$$I) and interfering substances was achieved by inductively coupled plasma-tandem quadrupole mass spectrometry (ICP-MS/MS) with a dynamic reaction cell introduced a mixture gas of O$$_{2}$$ and CO$$_{2}$$. As a result, the ratio of (background noise intensity at m/z 129)/$$^{127}$$I was 3.8 $$times$$ 10$$^{-10}$$ and 10 mBq/L of $$^{129}$$I was analyzed without chemical separation in the presence of 100 mg/L stable $$^{127}$$I. Spiked tests with actual rainwater were performed, and obtained values were agreed with the spiked amounts.



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Category:Chemistry, Analytical



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