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原理用放射性~(32)P标记磷酸三丁酯(TBP)两相分配法(简称~(32)P标记法)测量磷酸三丁酯在有机相中的活度系数时,必须用到TBP在水相中的活度系数值。由于TBP在水中溶解度很小,因而假定TBP在水相中的活度系数为1。但由此得到的TBP在有机相中的活度系数,通过Gibbs-Duhem公式转换得稀释剂活度系数时,与Healy T.V.~([4])用蒸气压法测出的值相差甚大。如对TBP-C_6H_6及TBP-CCl_4体系,用~32P标记法换算而得的C_6H_6和CCl_4的活
Principle To measure the activity coefficient of tributyl phosphate in organic phase by radioactive ~ (32) P-labeled TBP two-phase partitioning method (~ (32) P labeling method) Activity coefficient in aqueous phase. Due to the low solubility of TBP in water, it is assumed that the activity coefficient of TBP in the aqueous phase is one. However, the activity coefficient of TBP in the organic phase obtained by the conversion from the Gibbs-Duhem formula to the activity coefficient of the diluent is quite different from the value measured by the vapor pressure method of Healy T.V. (4). Such as TBP-C_6H_6 and TBP-CCl_4 system, with 32P labeling method derived C_6H_6 and CCl_4 live