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测定了若干个盐浓度下组氨酸在磷酸二异辛酯（Ｄ２ＥＨＰＡ）微乳状液中萃取的分配系数随ｐＨ值的变化关系，利用萃取平衡关系回归出组氨酸在水溶液中的两种主要离子的分配系数随盐浓度变化及其关系式中的参数，从而建立了组氨酸在本萃取体系中分配系数随ｐＨ值及盐浓度变化的数学关系式。
The partition coefficient of histidine in the microemulsion of di-iso-octyl phosphate (D2EHPA) was measured at several salt concentrations. The relationship between the partition coefficient and the pH value of histidine in the aqueous solution The partition coefficient of ions varies with the salt concentration and the parameters in the relational formula, thus the mathematical relationship between the partition coefficient of histidine and the salt concentration in this extraction system is established.