Abstract

The equilibrium molalities Tl+ were measured in {Tl2SO4 + Na2SO4 + D2EHPA + n-C8H18 + Water} system at ionic strength from 0.1 to 2.0 mol kg−1 containing Na2SO4 as supporting electrolyte in aqueous phase and at constant molality extractant at temperatures from 278.15 K to 303.15 K in organic phase. The standard extraction constants K 0 at various temperatures were obtained by methods of extrapolation and polynomial approximation. Thermodynamic quantities for the extraction process were calculated.

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