Some remarks on the double layer correction to the kinetics of ion transfer at the interface of immiscible electrolytes

The significance of the Frumkin correction at the liquid \ liquid interface is discussed critically. It is shown that it applies only at equilibrium, that is, in the absence of faradaic current. Instead, a correction introduc ed by Senda, the Levich correction, should be used if the system is not at the equilibrium. The magnitude and importance of the Levich correction is c onsidered using a simplified model for the potential profile across the int erfacial region. It is also suggested that due to the large potential drop in the organic phase diffuse double layer, the 'inner' layer potential diff erence, if such a quantity exists, is perhaps too small to allow the measur ement of the potential dependence of ion transfer. (C) 1999 Elsevier Scienc e S.A. All rights reserved.