Abstract
Potassium–dicyclohexyl-18-crown-6 complex was used as a highly efficient carrier for the transport of palladium as PdCl2−4 complex anion through a chloroform bulk liquid membrane. In the presence of thiocyanate ion as a suitable stripping agent in the receiving phase, the amount of palladium transported across the liquid membrane after 2.5 h is 99.2 ± 1.1%. The selectivity of Pd2+ transport from aqueous solutions containing other Mn+ cations such as Mg2+, Ca2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Hg2+, and Fe3+ was investigated. In the presence of EDTA as a suitable masking agent in the source phase, none of the cations used interfered with palladium transport, even at a Mn+/Pd2+ molar ratio of 10.
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