Sir: We have studied the anodic oxidation of cuprous sulfide in acidic medium, using a carbon paste electrode.This electrode, developed by Schultz and Kuwana (7) andFrench (2), is essentially used for the study of sparingly soluble electroactive compounds (3-6).The paste consists of a mixture of powdered graphite, the electroactive compound, and a pasting liquid or "binder" which is either a nonconductive liquid, such as Nujol (1)(2)(3) or an electrolyte (4-7).Electrodes are made by packing the paste into a tube, against a glassy carbon contact, and covering the paste with a glass frit (6).The carbon paste electrode, a reference electrode, and a counter electrode are immersed in an electrolytic solution. Voltamperometric curves can be obtained, using the electrode in a stationary mode. The curves present a low residual current.
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