The competitive metal ion transport of copper(II), cobalt(II), zinc(II), cadmium(II), silver(I), chromium(III) and lead(II) with a S–O donor compound was examined. Competitive transport experiments involving the metal cations from an aqueous source phase through an organic membrane into an aqueous receiving phase have been carried out using 5,12_di(phenoxymethyl)_1,4_dioxa_7,10_dithiacyclododecane_2,3_dione as the ionophore present in the organic phase. Fluxes and selectivities for competitive metal cations transport across bulk liquid membranes have been determined in a variety of chlorinated hydrocarbon and aromatic hydrocarbon solvents. The membrane solvents include: dichloromethane (DCM), chloroform (CHCl3), 1,2_dichloroethane (1,2_DCE), and nitrobenzene (NB) and also in chloroform_dichloromethane (CHCl3_DCM) and chloroform_nitrobenzene (CHCl3_NB) binary mixtures. Although the selectivity for silver(I) cation in all of these organic solvents is fundamentally similar, but the most transport rate for Ag(I) was obtained in dichloromethane. The sequence of transport rate for silver ion in organic solvents was: DCM >CHCl3 > 1,2_DCE > NB. A linear relationship was observed between the transport rate of silver ion and the composition of CHCl3_DCM, but a non_linear behavior was observed in the case of CHCl3_NB binary solution. The influence of the stearic, palmetic and oleic acids as surfactant in the membrane phase on the transport of the metal cations was also investigated.

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