Separation Study of Cadmium as CdI₄^2- through a Bulk Liquid Membrane Containing Ketoconazole and Oleic Acid

Abstract

A chloroform membrane system containing a given mixture of ketoconazole and oleic acid was applied for the uphill transport of Cd²⁺ ions as CdI₄^2-. In an HCl medium the ligand could form a stable ion-pair with CdI₄^2-, which was readily extractable in the membrane phase. A weak basic solution (pH 8) was used as a suitable stripping medium for the quantitative transport of cadmium across the liquid membrane after 120 min. The selectivity and efficiency of Cd²⁺ transport from an aqueous solution containing other cations, such as Co2⁺, Cr³⁺, Ni²⁺, Fe²⁺, Mn²⁺, Pd²⁺ and Zn²⁺ ions, were investigated. It was found that none of these cations interfered with Cd²⁺ transport.