Polarography of Thioglycolic Acid

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Abstract
Thioglycolic acid exhibits polarographic behavior at the dropping mercury electrode similar to cysteine and glutathione. A reversible anodic wave is found, the characteristics of which correspond to the formation of a mercurous thioglycolate complex. This wave is suitable for the analysis of thioglycolic acid in solutions. A second irreversible anodic wave probably is due to the formation of an insoluble mercuric monothioglycolate. The standard potential of the electrode reaction has been calculated from the experimental results. Dithiodiglycolic acid is irreversibly reduced to thioglycolic acid at the dropping mercury electrode. Calculated diffusion coefficients of various species from polarographic data are given.

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