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The transport rates of transition metal cations were increased in order of Ni(Ⅱ) < Co(Ⅱ) < Cu(Ⅱ) < Zn(Ⅱ) through a bulk liquid membrane containing 1,12-diaza-3,4;9,10-dibenzo-5,8-dioxacyclooctadecane(NtnOenH4) and 1,12,15-triaza-3,4;9,10-dibenzo-5,8-dioxacyclo-heptadecane(NdienOenH4) as carriers. The transport rates of transition metal cations was found to be of first order to the salt concentrations. It was also found that the dissociation process in the transport process is rate determining step. From the measurements of the transport rates at various temperatures, the partition free energies of hydration(ΔGp) for the transition metal cations were calculated. The results showed that the order of transport rates of transition metal cations was found to be proportional to the magnitudes of negative value of the partition free energies of hydration(ΔGp)
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