MEMBRANE-TRANSPORT OF COBALT, COPPER AND NICKEL WITH TRIOCTYL AMINE

The transport of-cobalt, nickel and copper through supported liquid me mbrane (SLM) containing as carrier trioctyl amine (TOA) has been studi ed. The effect of both carrier concentration and hydrodynamics of the system on the ion transport had been analyzed. The experimental data s howed a high effect of boundary layers in the aqueous phases on the me tal transport. A maximum in the curves of Co(II) and Cu(II) flux at ca 1.5 M of TOA was explained by the decrease of the diffusion coefficie nt of metal complex with the increasing concentration of the TOA carri er. Ni(II) ion was nor transported in the whole range of experimental conditions studied. This difference in transport behaviour was attribu ted to the fact that in chloride solutions; Co(II) and Cu(II) form ani onic complexes of the type MeCl(4)(2-) while Ni(II) has do tendency to do so.