Steady-state current at microelectrodes for arbitrarily charged species and various concentrations of supporting electrolytes

Equations for the dependence of the limiting steady-state current on concen tration of supporting electrolyte for arbitrarily charged species were deve loped based on the general theory of steady-state voltammetry by Myland and Oldham [1]. The only limitations of the proposed model are that the electr ode reaction must result in the neutral product and that diffusion coeffici ents of all species do not differ significantly. Theoretical predictions pr esented as a ratio of the limiting current, I-l, to diffusional current, I- d, are compared with experimental data for reduction of Tl+ and Cd+2 at mer cury film microelectrodes in solutions of various concentrations and types of supporting electrolyte. Experimental results agree well with theoretical predictions.