盐酸中Pu（III），Pu（IV），Pu（VI）的制备及紫外-可见吸收光谱

Preparation and Ultraviolet-Visible Absorption Spectra of Pu（III）, Pu（IV） and Pu（VI） in Hydrochloric Acid

报道了Pu（III）、Pu（IV）、Pu（VI）等单一价态溶液的制备方法，并建立了利用紫外-可见-近红外光区的特征吸收谱来鉴别钚离子各价态的分析方法．首先在盐酸介质中采用氧化还原剂制备了Pu（III）、Pu（IV）、Pu（VI）三种价态溶液。确定了最佳实验条件．随后考察了上述样品溶液在紫外-可见-近红外区的吸收光谱，并对特征吸收峰进行了归属．结果表明，Pu（III）在560、600、665、900nm处有较强的吸收峰：Pu（IV）在470、550、660、795nm处有较强的吸收峰：Pu（V1）在835、950、990nm处有较强的吸收峰．本文实验结果表明，可以利用特征吸收峰对不同价态的钚离子进行快速鉴别，与国外文献报道结果一致，该结果对后续研究工作具有一定的技术支持．

We describe the preparation of single-valence solutions of Pu and the identification of Pu ions with different valences via their ultraviolet-visible-near-infrared （UV-Vis-NIR） spectroscopic characteristics. The optimal experimental conditions were established, and then three types of Pu stock solution, i.e., Pu（III）, Pu（IV）, and Pu（VI）, were prepared by redox reactions in HCI solution. We investigated their UV-Vis absorption spectroscopic properties. The characteristic absorption peaks were identified for Pu（III） （560, 600, 665, 900 nm）, Pu（IV） （470,550,660, 795 nm）, and Pu（VI） （835, 950,990 nm）. We used these results to develop a method for identifying Pu ions via their characteristic absorption peaks. The conclusions are in accordance with those reported in previous work, and provide a new technique for subsequent research.