吸收光谱法直接测定乏燃料溶解液及1AF料液中Pu(Ⅵ)的含量

Determination of Pu(Ⅵ) in Spent Fuel Solution and 1AF Feed by Absorption Spectrophotometric

摘要: 钚是乏燃料后处理过程最重要的产品。乏燃料溶解液和1AF料液中Pu(Ⅵ)的含量影响钚的收率，因而需要准确测量。采用吸收光谱法研究建立了1AF料液中Pu(Ⅵ)的分析方法，方法检测下限为5.8 mg/L，两次重加回收率分别为103%和96%，采用燃耗为45 000 MWd/t（以U计）的乏燃料溶解液和1AF料液进行了总钚含量测量方法的验证，测量结果与混合K边密度计-X射线荧光法测量结果吻合，相对偏差不大于3%。

Abstract: Plutonium is the most important product in spent fuel reprocessing. The content of Pu(Ⅵ) in spent fuel solution and 1AF feed affects the recovery of plutonium, so it needs to be measured accurately. In this paper, an analytical method for Pu(Ⅵ) in 1AF was established by absorption spectrometry. The detection limit of the method is 5.8 mg/L, and the recovery are 103% and 96% respectively. Total plutonium content was verified by using the spent fuel solution and 1AF feed with burn-up of 45 000 MWd/tU. The determination results are consistent with those measured by Hybrid K-edge/XRF densitometer method, and the relative deviation is not more than 3%.