INDUCED REACTANT ADSORPTION IN NORMAL PULSE POLAROGRAPHY OF LABILE METAL + POLYELECTROLYTE SYSTEMS .2. STUDY OF THE CURRENT POTENTIAL RELATIONSHIP ASSUMING POTENTIAL-DEPENDENT ADSORPTION PARAMETERS

An improvement of a previous model for the interpretation of the normal pulse polarographic reduction of a metal ion in a metal + polyelectrolyte system, including both the adsorption of polyelectrolyte and the induced adsorption of the metal ion, is presented. The model has been extended to take into account the dependence of the adsorption parameters on the applied potential. This dependence is introduced by considering two different values of the adsorption coefficient during the drop life, corresponding to the potentials before and during pulse application. The influence of the physical parameters included in the model on the maximum and limiting currents is studied in detail by numerical simulation.