CATALYTIC POLAROGRAPHIC CURRENTS IN THE NICKEL-GLUTATHIONE SYSTEM .2. ADSORPTION EFFECTS AND REACTION-MECHANISM OF NICKEL REDUCTION

The nature of the nickel prewaves produced by glutathione (Glu) is discussed taking into account previous data on complex formation 1 as well as experimental data connected to the interface effects and reaction kinetics. It is shown that the first prewave involves adsorbed Glu, whereas the second one has a bulk-character. Although high concentration of Glu are required, the electrode processes are still of catalytic type since at pH < 8 only a minor part of Glu bind nickel ion giving reducible complexes.