AC STRIPPING VOLTAMMETRY FROM MERCURY FILM ELECTRODES .2. COMPARISON OF THEORETICAL AND EXPERIMENTAL RESULTS

The theory of ac anodic stripping from mercury film electrodes on glas sy carbon was tested experimentally. Both de and ac experiments were c arried out at different electrode thicknesses, amalgam concentrations and frequencies. Pb, Cd and Tl were used as analytes. The de results s how quantitative agreement with the de Vries-Van Dalen theory. The res ults for the ac experiments show reasonable agreement with theory for thickness l > 0.05 mu m under the given experimental conditions. The d isagreement found for thinner electrodes is attributed to non-continui ty of the film and the influence of spherical diffusion.