Analytical Sciences

Highly Selective and Efficient Membrane Transport of Silver as AgBr₂^- Ion Using K⁺-decyl-18-crown-6 as Carrier

Javad ZOLGHARNEIN,  Sheida HOSSEINI, Golamhassan AZIMI, and Mohammad Reza SANGI

Department of Chemistry, Arak University, P. O. Box 38156-879 Arak, Iran

Potassium-decyl-18-crown-6 was used as a highly selective and efficient carrier for uphill transport of silver as AgBr₂^- complex ion through a chloroform bulk liquid membrane. When thiosulfate anion was used as a metal ion acceptor in the receiving phase the amounts of silver transported across the liquid membrane after 120 and 180 min were 87.0 ± 1.8% and 96.0 ± 1.9%, respectively. The selectivity and efficiency of silver transport from aqueous solution containing Cu²⁺, Zn²⁺, Ni²⁺, Cd²⁺, Pb²⁺ and Fe³⁺ ions were investigated. In the presence of EDTA at pH = 4 as suitable masking agent in the source phase, the interfering effects of Pb²⁺ and Fe³⁺ ions were diminished drastically.

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