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  • 1 Chemical Dynamics Laboratory, The Boris Kidrič Institute, P.O. Box 522, 11001 Belgrade, Yugoslavia
  • | 2 Organic Chemistry Department, Faculty of Natural Sciences and Mathematics, The University of Novi Sad, 21000 Novi Sad, Yugoslavia
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A simple graphical method for determination of thermodynamic equilibrium constants, developed for ion-exchange and solvent extraction processes, was successfully applied to a liquid exchangersystem. Close values of the thermodynamic equilibrium constants for the system uranyl chloride—hydrochloric acid—di-2-ethylhyxyl phosphoric acid—toluene (K=7.8±0.8) were obtained when the ionic strength of the aqueous phase was varied and the concentration of di-2-ethylhexyl phosphoric acid in the organic phase was kept constant, and vice versa.