Modeling of specific adsorption of ions at electrodes during the passing from a mixed solution of constant ionic strength to a binary solution

Electrocapillary curves in the mc NaNO3 + (1-m)c NaF mixed solutions are calculated in terms of the Alekseev-Popov-Kolotyrkin model. The analysis of limiting case m=1 shows that in a NaNO3 binary solution the model predicts quadratic dependence of the NO3- anion adsorption energy on the potential, which contradicts to experimental data. A modification of the model is suggested, which allowed removing this contradiction.