Abstract
The convection electrode system with the rotating disk as a stirrer developed recently in our Laboratory is considered to be fairly unique, because it allows a voltammetric determination of micro amounts of depolarizers at concentrations as low as 10-7-10-8M, and in addition, it offers a simple method for determining the rate constants for moderately rapid electron transfer process. In the investigation for the kinetics of the electrode reaction the rate of mass transfer should be comparable to that of electron transfer. At the convection electrode, the rate of mass transfer can be controlled by varing the rotating disk velocity. Therefore, it can be expected that the very rapid electron transfer rate might be measured by increasing the disk velocity. The limiting current for the convection-controlled process of redox system at the platinum electrode is generally given as follows :
iτ=KnFACD2/3μ1/2ν-1/6d-1/2
