Abstract

Summary It has been shown that the specific adsorption of caesium ions from the constant ionic strength system can be described at the bismuth-aqueous solution interface by the virial isotherm, including the concentration of surface-active ions at the outer Helmholtz plane as a concentration variable; at the same time the specific adsorption of counter-ions must be excluded. Comparison of the main characteristics of adsorption isotherms applicable to description of specific adsorption of cations at the bismuth electrode has been made. An estimate of the accuracy of calculation of the charge of specifically adsorbed ions has been made by means of the potential shift due to adsorption of surface-active ions at constant electrode charge.

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