ELECTROREDUCTION OF HEXAVALENT CHROMIUM COMPOUNDS ON THE GOLD ELECTRODE

Kinetic regularities pertaining to electroreduction of compounds of he xavalent chromium (1 M CrO3) to the trivalent state are investigated o n the gold electrode. It is shown that this reaction proceeds by the C E mechanism. The chemical step, preceding the discharge, involves some compounds (H2SO4, HCOOH, HF HCl, etc.) that accelerate reduction of C r(VI). They are incorporated into electroactive surface compounds (sub stituted polychromates) and carry out electron transfer by the bridge mechanism.