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本文提出了一种测定微量铀的新方法,它利用了协萃反应的放射性元素置换作用,其反应式如下:UO_2~(2+)+CeA_3B_(2(0))+H~+(?)UO_2A_2B_((O))+HA_((O))+B_((O))+Ce~(3+)此处HA为1-苯基-3-甲基-4-苯酰基-吡唑啉酮-5,B为磷酸三丁酯。由于UO_2A_2B的萃取常数大于CeA_3B_2的萃取常数,因此在CeA_3B_(2(O))中的Ce~(3+)离子能被UO_2~(2+)离子所置换,从~(144)Ce的计数率可以间接测定微量铀。
In this paper, a new method for the determination of trace uranium is proposed, which takes advantage of the radioactive element substitution of the co-extraction reaction. The reaction equation is as follows: UO_2 ~ (2 +) + CeA_3B_ (2 (0)) + H ~ + UO_2A_2B_ (O) + HA_ (O) + B_ (O) + Ce ~ (3+) where HA is 1-phenyl-3-methyl-4-benzoyl-pyrazolone -5, B is tributyl phosphate. Since the extraction constant of UO_2A_2B is larger than the extraction constant of CeA_3B_2, the Ce 3+ ions in CeA_3B_ (2 (O)) can be displaced by UO_2 ~ (2+) ions and the counting rate of ~ (144) Ce Trace indirect determination of uranium.