The activity coefficients of all the components in H_2SO_4-CuSO_4 solution were calculated by using Pitzer's equation.Six Pitzer's mixing parameters μ and were evaluted.The change of the activity and concentration of the ions during extraction was measured by drop weight method.The interfacial excesses of all the components were calculated from the interfacial tension equation which is expressed in terms of activities of every components.Results show that H~+ and Cu~(2+) are positively adsorpted by CuR_2,(HR)_2 ,SO_4~(2-) and HSO_4~- are negatively adsorpted on the interface.
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