Abstract
A new supported liquid membrane (SLM) system for the selective transport of zinc ion is described. The SLM used is a thin porous polyvinyldifluride membrane impregnated with dicyclohexyl-18-crown-6 dissolved in nitrophenyloctyl ether. Potassium-dicyclohexyl-18-crown-6 acts as a highly efficient carrier for the uphill transport of zinc as Zn(SCN) 4 2− through the SLM. In the presence of l-Cysteine as a metal ion acceptor in the strip solution, transport of zinc occurs almost quantitatively after 5 h. The selectivity and efficiency of zinc transport from aqueous solution containing different mixtures of Co 2+, Ni 2+, Cu 2+, Pb 2+, Cd 2+, Hg 2+, Fe 3+ and Cr 3+ ions were investigated. In the presence of citrate ion and thiourea as suitable masking agents in the feed solution, the interfering effects of Pb 2+ and Cu 2+ ions were completely eliminated.
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