SPECIFIC UPHILL TRANSPORT OF CD2-18-CROWN-6 AND PALMITIC ACID( ION BYA COOPERATIVE CARRIER COMPOSED OF AZA)

A given mixture of aza-18-crown-6 and palmitic acid was found to be an excellent cooperative carrier for the specific uphill transport of ca dmium ions through a chloroform membrane. In the presence of thiosulfa te ion as a suitable metal ion acceptor in the receiving phase, the am ount of Cd2+ ion transported across the liquid membrane after 80 min i s 93.9 +/- 1.0%. The selectivity and efficiency of cadmium transport f rom aqueous solutions containing other cations such as Fe3+, Co2+, Ni2 + Cu2+, Zn2+, Pb2+, Ag+ as well as alkali and alkaline earth cations w ere investigated. In the presence of thiocyanate, as a proper masking agent in the source phase, the interfering effects of Cu2+ and Ag+ ion s were successfully eliminated.