Аннотация:The data obtained confirm the relations derived by the authors, both under the condition of weak specific adsorption of cations and under the condition where the surface charge is reversed by specifically adsorbed anions. Using these data one can readily see that one specific relation is fulfilled to within no more than 1. 8%. Therefore, under conditions where compact-layer capacity is practically independent of the specific adsorption of ions, a linear relation between adsorption energy and psi in the, APK (Alekseev-Popov-Kolotyrkin) model is matched by a linear relation between adsorption energy and q in the GP (Grahame-Parsons) model, and the parameters of these two models can be interconverted with the aid various relations.