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.
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