Abstract
The paper presents the results of studies on potential dependent properties of typical extraction systems: UO 2(NO 3) 2-H 2O-TBP, Ca(NO 3) 2-H 2O-TBP, Co(NO 3) 2-H 2O-TBP (TBP-tri- n-butyl phosphate) treated as membrane systems with an immobilized aqueous phase. It was shown that the processes influencing on the membrane potential in the studied system depended mainly on extraction constants. The electrode functions of the systems depended on concentration of salts in the immobilized aqueous phase and concentration of solvate in the organic phase. It was found that the activity coefficients could be determined from the dependence describing the electrode potential in the concentrated solvate solutions.
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