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A chloroform membrane system containing a given mixture of aza-18-crown-6 and palmitic acid was applied for the uphill transport of Pb2+ ions. In the presence of P2O7 4− ion as a suitable metal ion acceptor in the receiving phase, the amount of lead ion transported across the liquid membrane after 100 minutes is 89.1 ± 1.3%. The selectivity and efficiency of lead transport from aqueous solutions containing other cations such as Zn2+, Cu2+, Ni2+, Co2+, Fe2+, Pd2+, and Ag+ ions were investigated. In the presence of S2O3 2− ion as a proper masking agent in the source phase, the interfering effects of Cu2+ ion were diminished drastically.
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Akhond et al. (1997) studied this question.
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