Theory of ion-pair extraction in terms of standard ion-transfer potentials of individual ions.

Abstract

A novel approach to the theory of ion-pair extraction of monovalent anion with divalent cation is presented. The theory has been applied to the solvent extraction of anions with tris(1, 10- phenanthroline)iron(II) cation from the aqueous to the nitrobenzene phase. The results indicate that the standard ion-transfer potentials provide useful criteria for evaluating ion-pair extraction when the ion association is either negligible or not strong.