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采用Fourier红外光谱法测定了三辛胺-醋酸体系中不同结构萃合物的组成比，讨论了不同萃合物的组成比随萃取剂成分（络合剂浓度、稀释剂种类）的变化趋势．对离子对萃合物的百分率与络合萃取平衡分配系数D间相互关系的研究表明，离子对萃合物的比例越大，络合萃取相平衡分配系数也越大．
Fourier transform infrared spectroscopy (FTIR) was used to determine the composition ratio of different structures in the trioctylamine-acetic acid system. The compositional ratio of different extracts was discussed with the change trend of extractant composition (complexing agent concentration and diluent type). The study on the relationship between the percentage of ion-pair extractives and the equilibrium partition coefficient D of complex extraction showed that the larger the ratio of ion-pair extractives, the larger the equilibrium partition coefficient of the complexed extraction phase.