Abstract

The specific adsorption of Cs + on the Hg electrode from ethylene glycol and 1,2-propylene glycol has been studied by means of capacity measurements using the method of the mixed electrolyte (LiCl + CsCl) at constant ionic strength. Adsorption has been found to obey a virial isotherm only formally. If account is taken of the effect of the diffuse layer, deviations are observed which increase with concentration, electrode surface charge and amount of specific adsorption. At low surface concentration of specifically adsorbed charge, the adsorption parameters have been found to depend on electrode charge and bulk electrolyte concentration. The observed behaviour is explained in terms of ionic association in the inner layer as a consequence of the tendency to form ion pairs in the solution bulk in the non-aqueous solvents investigated.

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