Abstract
Abstract The rate of picrate transport coupled to a diffusion of potassium ions through a bulk 1,2-dichloroethane membrane has been measured. The membrane, containing a potassium ionophore separated two aqueous phases, one containing picrate and potassium salt and the other containing picrate and lithium salt. The picrate anion was accumulated against the concentration gradient in the aqueous phase containing the lithium salt. The rate of picrate transport incrased with increasing ionophore concentration and in the absence of the ionophore, the transfer of picrate did not occur. The effect of potassium and lithium counter-ions such as chloride, nitrate and sulfate on the transport of picrate has been examined. The combination of potassium sulfate and lithium nitrate showed the highest rate of transport. In the potassium nitrate-lithium nitrate system, the transport of picrate was appreciably depressed by the transfer of nitrate ions across the membrane. The decrease in concentration of potassium ion in the aqueous phase brought about a lowering of the rate of picrate transport. The rate of picrate transport rose according to the following order of ionophore : dicyclohexyl-18-crown-6>dicyclohexyl-24-crown-8>dibenzo-18-crown-6>dibenzo-24-crown-8>valinomycin.
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