Two different radiometric methods employed for studying adsorption on the solid electrodes are reviewed. Both methods are applicable for direct and quantitative determinations of the adsorbate accumulated on the electrode surface.
The first method, called the thin electrode method, is especially suitable for studies of adsorption of some organic substances, labelled with the b-emitters, on metals with rough surfaces. The method can be used to study adsorption as a function of bulk concentration, potential, time, temperature etc.
The second method, which is called the lowering electrode (the thin gap) method, is used for adsorption studies on the smooth polycrystalline as well as on the monocrystalline electrodes. The structural effects in adsorption processes can be investigated as well. A modification of this method by the use of a standard source is discussed. Both methods presented are illustrated with some examples.