Abstract
The kinetics of reduction of cadmium ion on a mercury electrode partly covered by n‐butanol, thymol, and leucoriboflavin and of plumbite ion in the presence of n‐butanol was examined by the method of faradaic impedance with polarographic generation of reactants. Exchange currents and rate constants were lower than expected on the basis of a linear dependence on coverage. A small increase in the transfer coefficient for the reduction of cadmium was observed with partial coverage by leucoriboflavin. Slopes of the impedance plots were independent of coverage. Changes in polarographic log plots and 
values with decreasing rate constant were in line with the accepted criterion for polarographic reversibility.