Determination of gold in copper matrix by anodic stripping voltammetry with gold activated graphite electrode

An impregnated graphite electrode was activated with gold and used in anodic stripping voltammetry for determination of gold in a copper matrix. Gold was then deposited on this electrode at potential +0.38 V vs. Ag/AgCl, so the interferences from other ions were eliminated or minimized. The determinations were carried out in air-saturated solutions without evaporation of excess of acids used during the sample dissolution. The medium-exchange procedure was applied in the measurements. The linear dependence of the gold stripping peak current ou the concentration of Au3+ in the range from 5x10(-8) to 1x10(-6) mol l(-1) was obtained in 1 mol l(-1) Cu2+ solution.