Abstract
Electrochemical oxidation of thiourea, which is not possible on platinum electrodes in strongly basic solutions, was found to be possible when a cationic surfactant. Hyamine 2389, was added to the aqueous solution to form micelles. The Hyamine solubilized the product of the oxidation and prevented the electrode from becoming passive. A study of the effect of pH on the voltammetric oxidation waves showed waves for the oxidation of the protonated species, the neutral thiourea, the thiourea anion and an adsorbed film of the first oxidation product. It was shown that the voltammetric oxidation waves obtained in the micelle system could be treated mathematically using the same equations used in the treatment of homogeneous solutions. It was found that it was a one-electron, irreversible, diffusion-controlled process producing formamidine sulfide. However, the pH in the surfactant film on the anode was apparently not the pH of the solution.
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