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Competitive transport experiments involving Fe+3, Cr+3, Ni+2, Co+2, Ca+2, Mg+2 and K+ metal cations from an aqueous source phase through some organic membranes into an aqueous receiving phase have been carried out using 4,13-diaza-18-crown-6 (kryptofix 22) as an ionophore present in the organic membrane phase. Fluxes and selectivities for competitive of the metal cations transport across bulk liquid...