A Study of Gold Reduction and Oxidation in Aqueous Solutions

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Abstract
The electrochemical behavior of gold in alkaline cyanide, citrate, and phosphate buffered solutions has been studied using cyclic voltammetry and galvanostatic transients. Two reaction paths were observed. At low overvoltage the reaction goes through an adsorbed intermediate. (rate determining) At larger overvoltages a direct transfer between the gold complex in solution and the metal atom was found on reduction. The reduction reaction was the same in all the solutions but in the phosphate and citrate baths the gold did not oxidize to a soluble species.

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