Highly efficient and selective membrane transport of silver(I) using dibenzodiaza-15-crown-4 as a selective ion carrier

A chloroform membrane system containing dibenzodiaza-15-crown-4 was found to be a highly efficient and selective transport of Ag+ ions through a chloroform liquid membrane. In the presence of thiosulfate ion asa suitable ion stripping agent in the receiving phase, the amount of silver transported across the liquid membrane after 105 min is 95 +/- 1.3%. The selectivity of Ag+ transport from aqueous solutions containing Tl+, Pb2+, Cd2+, Ni2+, CO2+, K+, Ca2+, Sr-2+,Sr- Hg2+, Zn2+, Cu2+ was investigated. The interfering effect of Cu2+ ions was drastically diminished in the presence of EDTA as a proper masking agent in the source phase.