Abstract
Impedance measurements of the water—1,2-dichloroethane (1,2-DCE) interface in the presence of supporting electrolytes in both phases and picrate ions in the organic phase have been carried out using ac voltammetric and ac bridge methods. The analysis of the impedance data has been performed according to a simple electrical equivalent circuit. An improved method for the evaluation of these model components has been applied. It has been found that the capacity of the interface has a higher value than that calculated from the Gouy—Chapman theory. This can be caused by the surface charge transfer reactions or by the limited application of Gouy—Chapman theory in the system studied, considered by other authors. The interface capacity found in the presence of picrate ions in the organic phase has higher values than that observed in the presence of supporting electrolytes only.
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