NEW METHODS FOR THE APPLICATION OF AN ALTERNATING-CURRENT .3. APPLICATION OF COMBINED DIRECT AND ALTERNATING CURRENTS AT STANDARD ELECTRODES

A theoretical and experimental analysis of the E-t response correspond ing to an electrolysis carried out using a combination of direct and a lternating currents is presented. This study has been applied to a slo w higher-order electrochemical reaction at standard electrodes (droppi ng mercury electrode (DME), static mercury drop electrode (SMDE) and p lane electrode), without restrictions on the values of the amplitude a nd frequency of the alternating current. The use of current-time funct ions of this type allows the selective determination of the transition times of oxidized species for any cycle of the E-t response, as well as an i-E response for a complete a.c. cycle even when the reduced spe cies is not initially present in the solution.