ABSTRACT
Analysis of polarographic and other voltammetric signals has led to much insight into the nature of electrode processes and has contributed to the development of industrial processes and to the identification of the controlled parameters required for their efficient exploitation. Potentiometrie techniques use measurement of electrode potentials and their variation with the changing chemical environment induced by the progressive interaction of a titrant and a titrand. Quantitative electrochemical generation of a titrant—a direct application of Faraday's laws—makes possible the design of coulometric titrations. The potentials of electrodes which behave irreversibly show considerable variation in value when they pass a current. The profile of a current-voltage curve can reflect a more or less complex interplay of sequential electron-transfer processes further complicated by the involvement of associated chemical reactions. The current plateau corresponds to the condition that metal ions are reduced as fast as they reach the electrode by natural diffusion.
