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The interface between a water and a nitrobenzene phase is considered. In both phases some surface active electrolyte, cetyltrimethylammonium bromide, is dissolved and both phases are in equilibrium. When a constant electric current flows through that interface the interfacial tension changes. This variation in interfacial tension is explained by a difference in transport numbers of the cation in both phases. A mathematical analysis is given. For depletion experiments good agreement between experiments and theory is observed; for accumulation experiments good agreement occurs only for high concentrations or for short times.

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