Abstract
Procedures are described for the determination of bismuth impurities in. copper using anodic stripping voltammetry on a hanging mercury drop electrode. Bismuth was previously separated from copper by cation or anion exchange in hydrochloric acid. The method was applied to the analysis of commercially available high purity copper, showing satisfactory sensitivity and accuracy. The detection limit was about 2×10−9 M bismuth in solution for a pre-electrolysis time of 15 min (−0.5 V vs. Ag/AgCl); this corresponds to 0.004 ppm of bismuth for a 1 g sample and a final volume of 10 ml after separation.
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