土壤和沉积物中痕量Pu的ICP-MS测量方法研究

Abstract

Abstract: As a widely accepted method of measuring ultra-trace level Plutonium isotopes in environment samples, the most difficulty and inaccuracy of ICP-MS measurement is from the interference of matrix elements, mainly uranium. In this research, we employed acid digestion and a two-stage anion chromatography for extraction and purification of Pu from soil and sediment samples, which can achieve high decontamination factor of uranium up to 1.5×10⁵. By introducing a APEX-IR sampling system combined with a Spiro membrane desolvation unit, the yields of polyatomic interferences ²³⁸U¹H⁺and ²³⁸U¹H⁺₂, which are the main interferences of ²³⁹Pu and ²⁴⁰Pu, are as low as 3.4×10^-5and 7.6×10^-6, respectively. In case of using this method to analyze the Pu level of Chinese soils and sediments, the relative tolerances of measured results are supposed to be less than millesimal. The detection limit of this method for ²³⁹Pu and ²⁴⁰Pu are respectively 3.6 fg/mL and 7.3 fg/mL. This method is validated by analyzing soil and sediment reference materials IAEA-soil-6 and NIST-4357, both the ^239+240Pu concentration and ²⁴⁰Pu/²³⁹Pu atom ratio correspond well with the certified values.

Key words: Plutonium, ICP-MS, anion chromatography, decontamination factor

CLC Number:

O615.4+5

Ni Youyi, Bu Wenting, Hu Dan, Xu Hong, Wu Yucheng, Guo Qiuju. A method of measurement of ultra-trace level Pu isotopes in soil and sediment samples by ICP-MS[J].RADIATION PROTECTION, 2016, 36(5): 265-271.

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A method of measurement of ultra-trace level Pu isotopes in soil and sediment samples by ICP-MS

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