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本文将用放射性磷32标记法测得的二(2-乙基己基)磷酸在碱金属氯化物水溶液(LiCl、NaCl、KCl、RbCl、CsCl和NH_4Cl)中的溶解度数据,分别用Pitzer(1973年)方程和Pitzer-Li(1983年)方程进行活度系数的关联.计算结果表明,由于Pitzer-Li方程考虑了溶质-溶剂间的短程作用能,所得参数更能反映盐效应的本质,故优于Pitzer方程.同时还表明,上述体系中离子-水之间的作用能远大于离子-有机化合物之间的作用能。
Solubility data of di (2-ethylhexyl) phosphoric acid in aqueous alkali metal chlorides (LiCl, NaCl, KCl, RbCl, CsCl and NH4Cl) were measured by radioactive phosphorus 32 labeling using Pitzer (1973 ) And the Pitzer-Li (1983) equation.The calculated results show that since the Pitzer-Li equation takes into account the short-range interaction energy between solute and solvent, the obtained parameters can better reflect the essence of the salt effect, In the Pitzer equation, it is also shown that the interaction between ions and water in the above system can be much larger than that between ion-organic compounds.