Studies of organic compounds oxidation at constant current conditions with different anodes, indicate that the oxidative action of these anodes is related to their absorption characteristic i.e. the low or high difficulty of the generated hydroxyl radicals in reaching the solution. This paper shows that the adsorption does not concern the anodic surface, but an adjacent thin layer (adsorption layer) of the aqueous solution. An estimation of the fraction of hydroxyl radicals that move from the adsorption layer to the adjacent reactive/diffusive layer is obtained as well as a suitable tool for comparison the result of this approach with the experimental results. This comparison shows how the adsorption layer modulates the runway of the organic species oxidation.