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 as a 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 + , Pb 2+ , Cd 2+ , Ni 2+ , Co 2+ , K + , Ca 2+ , Sr 2+ , Hg 2+ , Zn 2+ , Cu 2+ was investigated. The interfering effect of Cu 2+ ions was drastically diminished in the presence of EDTA as a proper masking agent in the source phase.