Abstract
Traces of lead, cadmium, zind and manganese in copper and copper compounds are determined, in some cases simultaneously, by anodic stripping voltammetry on a hanging mercury drop electrode. The four metals are separated from the bulk copper(II) by preliminary electrolysis of the copper matrix at a controlled potential on a platinum cathode. The method is applied to commercially available high-purity copper, showing satisfactory sensitivity and accuracy. The determination limits are about 10 -9 M for lead, 5·10 -10 M for cadmium, 10 -9 M for zinc and 10 -8 M for manganese in solution ; this corresponds, respectively, to 0.01, 0.002, 0.003 and 0.03 p.p.m. for a 0.5-g sample in a final volume of 25 ml after separation. However, because of blank values, the final determination limits are about 0.1 p.p.m. for lead and 0.3 p.p.m. for zinc.
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