Abstract
Abstract The transfer of a cation across a supported liquid membrane is studied both theoretically and experimentally during a linearpotential scan. The transferring cation was originally present both in the membrane and in the flanking aqueous phases, thusworking as a potential-determining ion in the system. With this set-up, the transfer kinetics of hydrophobic ions which usuallydetermine the limits of the potential window of an ideally polarised liquid liquid interface can be studied, even if the standardpotential of transfer is unknown. The probe cation studied was tetrabutylammonium, and the membrane phase was o -nitropheny-loctyl ether. The observed standard rate constant k 0 took a surprisingly low value of ca. 2˛10 ˝4 cm s ˝1 ; however, this agreeswith the values measured with a rotating diffusion cell under steady-state conditions. It is therefore suggested that the differentvalues obtained with different techniques reflect the structural changes of the liquid liquid interface due to the electric current.© 2001 Elsevier Science B.V. All rights reserved.
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