Abstract
The oxidation of iodide at a rotating platinum disk electrode in methanol has been studied. At low concentrations only one oxidation wave is seen, but at higher concentrations two steps are discerned. This is in accordance with the theory, assuming that the equilibrium between iodide, triiodide and iodine is reached fast and the oxidation of iodide to iodine occurs reversibly. Only in approximately neutral and moderately alkaline solutions iodine can be oxidized to iodonium methoxide. The oxidation occurs irreversibly. Neutralization titrations confirm the formation of iodonium methoxide. The diffusion coefficients of the iodine species and the stability constant of the triiodide ion were determined.
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