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The influence of cation adsorption on the rate of the electroreduction and formation of cations as well as on the electroreduction of anions is discussed. The effects observed are correlated with changes of the 41-potentia1, but whereas in reactions with the participation of cations average values of the +l-potential can be used, in the anion electroreduction the dependence oL the 41-potential on the distance between the reacting anion and the cation which is its next neighbour must be taken into account. The electroreduction of the PtC42-anion which has a flat configuration shows a much smaller sensitivity towards cations than the electroreduction of the S2082-and Fe(CN)$-anions.Measurements of reaction rates and differential capacities in the presence of Cs + ons indicate a certain specific adsorbability of the Cs+ ion. If both the cation and the anion are surface-active, that effect of the adsorption on reaction rates which prevails at a definite potential is still enhanced.