PMBP萃取法分析硝酸介质中钚的价态

ANALYSIS OF PLUTONIUM VALENCE BY PMBP EXTRACTION IN NITRIC ACID MEDIUM

摘要: <正> 在核燃料后处理工艺、锕系元素分离、钚的核素迁移和钚的化学研究中常常需要测定钚的价态组成。除仪器分析方法外,诸如沉淀载带法,溶剂萃取法,离子交换法和萃取色层及纸上色层法等化学分离法也被广泛研究和使用。Savage等曾使用TTA-二甲苯萃取法进行混合价态钚溶液中Pu(Ⅲ),Pu(Ⅳ)和Pu(Ⅵ)的测定。由于TTA萃取四价钚平衡很慢,不仅分析时间很长,而且也给被测体系中Pu(Ⅲ)的稳定带来困难。

Abstract: By taking advantage of very high distribution coefficient of Pu(Ⅳ)and lowdistribution coefficient of Pu(Ⅲ)and Pu(Ⅵ),an analytical method of Pu(Ⅲ).Pu(Ⅳ)and Pu(Ⅵ)in nitric acid medium is developed.In which PMBP is usedas extractant,urea as the stabilizer of Pu(Ⅲ)and sodium nitrite as the oxidationagent of Pu(Ⅲ).The experimental results show that analytical procedures fordeterminating plutonium valence are satisfactory.