Abstract
Normal and reverse pulse (NP and RP) voltammetry of dopamine and epinephrine at stationary microdisk electrodes have been studied to assess the time parameters required for renewal of boundary conditions. For quasi-reversible systems, the proper choice of the initial potential in an NP experiment results in boundary renewal as for reversible systems. Experimental effects attributed to depletion were found to be close to those predicted from an equation relating the errors in the NP limiting current to ratios of pulse width to waiting time. Depletion effects observed in RP experiments were similar to those for NP experiments at the same ratio of time parameters. For irreversible systems and/or systems with follow-up chemical reactions, longer waiting times are needed for boundary renewal. Even for such systems, an adequate renewal of the surface boundary condition is assured at waiting times which are characterized by the dimensionless parameters appropriate for the experiment.
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