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以均二苯基-16-冠-5-氧代乙酸(E)作为一种新型萃取剂,研究了UO_2~(2+)和Th~(4+)的溶剂萃取行为。结果指出,其萃取效率受水相酸度的影响很大,在pH≈3.5时,Th~(4+)可以接近定量地被萃取,而UO_2~(2+)则几乎全部留在水相。保持水相酸度不变,得到UO_2~(2+)和Th~(4+)的分配比与有机相中E浓度的对数关系是线性的,斜率分别为1和2,表明在萃取过程中,它们分别同E形成了1:1和1:2的萃合物。建立了以E为萃取剂的分离U和Th的溶剂萃取方法,该法简单、方便、可迅速地分离得到高纯U和Th。在分析化学和核工业领域有良好的应用前景。
Solvent extraction of UO 2 2+ and Th 4+ was studied using a novel extractant, such as DDP-16-crown-5-oxoacetic acid (E). The results show that the extraction efficiency is greatly affected by the acidity of the aqueous phase. At pH≈3.5, Th ~ (4 +) can be extracted quantitatively and almost all of UO_2 ~ (2+) remains in the aqueous phase. The logarithm of the distribution ratio of UO 2 2+ and Th 4+ to the concentration of E in the organic phase is linear with a slope of 1 and 2, respectively, indicating that the acidity of the aqueous phase remains the same, indicating that during the extraction process , They were formed with the E 1: 1 and 1: 2 extract. A solvent extraction method was developed for the separation of U and Th with E as extractant. This method was simple, convenient and rapid to separate U and Th. In the field of analytical chemistry and nuclear industry has good application prospects.