痕量镎和钚的ICP-MS分析方法

Determination of Trace Neptunium and Plutonium by ICP-MS

摘要: 经TOA萃取色层柱分离环境样品，2次上柱，将Np和Pu同时洗脱，²³⁹Pu的化学回收率为 (92.7±3.1)%，²³⁷Np为(96.8±2.7)%，实现了ICP-MS同时测定痕量Np和Pu的含量。应用稀释剂²⁴²Pu，通过同位素稀释ICP-MS法测量痕量²³⁹Pu和²⁴⁰Pu的含量，用IAEA标样对方法进行验证，Pu 的测定值与标样的推荐值吻合较好（标样中无Np的标准值），证明了ICP-MS同时测定痕量Np和Pu的可行性。

Abstract: A single TOA extraction chromatographic column with a twostage sample loading was used to separate Np and Pu from the environmental samples. Preliminary studies were performed to determine both Np and Pu by ICP-MS in one run. The ²³⁹Pu recovery of （92.7±3.1）％ and ²³⁷Np recovery of （96.8±2.7）％ in environmental samples were obtained. By spiking with ²⁴²Pu, isotope dilution ICP-MS was applied to measure ²³⁹Pu and ²⁴⁰Pu. The feasibility for the determination of both Pu and Np was proved by analyzing IAEA-135 reference samples. The measured values for Pu are in good agreement with recommended reference value (no Np standard value available).