Abstract
A procedure is described for the simultaneous determination of copper, cadmium, lead, and zinc ions in drinking and natural waters. The lowest concentrations that could be determined were 10−8 M for cadmium and lead ions, and 2·10−8 M for copper and zinc ions. In the case of copper, cadmium, lead and zinc, the pH of the acetate buffer solution (or that of the 0.1 or 0.02 M of KCl solution) as supporting electrolyte, if kept below 7 has no effect on the oxidation current peaks; at higher pH values, however, the current peaks become considerably smaller. Since deaeration with nitrogen tends to increase the pH, a buffer solution must be used as supporting electrolyte. For the simultaneous determination of copper, cadmium, lead and zinc ions in water, a 0.1 M acetate buffer solution, pH 5.8, was used as supporting electrolyte.
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