Adsorption of methionine on the mercury electrode from 0.5 to 8 mol dm À3 chlorates(VII) was examined. In all the systems studied the relative surface excesses of methionine increase with the increase of electrode charge and adsorbate concentration, they depend also on chlorates(VII) concentration. The adsorption parameters were determined from the Frumkin and virial isotherms. It was stated that the adsorption parameters change together with the change of supporting electrolyte concentration, what points at competitive adsorption of methionine and ClO À 4 ions and electrostatic interactions between the water dipoles and methionine in the double layer.
The paper describes the results of the studies of organic substances catalytic activity on Zn(II) ions electroreduction on mercury in perchlorate solutions. Zn(II) ions electroreduction in the presence of catalyzing substance proceeds in two one-electron stages. The first electron transfer is the stage determining the process rate. All catalyzing substances increase the rate of first electron transfer. The acceleration effect is connected with the stability of active complexes formed on the electrode surface. The rate of the second electron transfer depends mainly on the adsorption of the catalyzing substance on the electrode surface -of the surface excess and the structure of the adsorption layer. Hence the second electron transfer can be inhibited or catalyzed. The mechanism of the organic substance catalytic activity is also given.
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