STUDIES ON THE THERMODYNAMICS OF THE SOLVENT-EXTRACTION OF METAL .2. IN2(SO4)3+NA2SO4+D2EHMTPA+N-C8H18+H2O

The molality of In3+ and pH of the extraction equilibrium [GRAPHICS] in {In2(SO4)3 + Na2SO4 + D2EHMTPA + n-C8H18 + H2O} were measured at ionic strengths from 0.1 to 2.0 mol/kg in an aqueous phase containing the supporting electrolyte Na2SO4 at temperatures from 278.15 to 303.15K and with a constant original molality of extractant in the organic phase. The standard thermodynamic extraction equilibrium constants K(theta) were obtained by each of two methods proposed in our previous paper. then the thermodynamic functions for the extraction process were calculated.