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The contact value of the charge profile for nonsymmetrical electrolytes ispresented as the sum of three contributions. One of them is the normalcomponent of the Maxwell electrostatic stress tensor. The second one is thesurface electrostatic property defined as the integral of the product of thegradient of the electrical potential and the density distribution function ofcoions. The third term is the bulk contribution defined by the sum for anionsand for cations of the product of their charge and their partial pressure. Fornoncharged surfaces only the last two are present and have the same sign in thecase of size asymmetry. In the case of charge asymmetry the contact value ofthe charge profile is the result of the competitions of bulk and surface termsin which the bulk term is dominant. Using both the contact theorems for thedensity and the charge profiles, the exact expressions for the contact valuesof the profiles of coions and counterions are obtained and some relatedproperties are discussed.

On the contact conditions for the charge profile in the theory of the electrical double layer for nonsymmetrical electrolytes