Determination of cadmium(II) at a gold electrode in the presence of selenium(IV) by anodic-stripping voltammetry with enhancement by iodide ion.
Anodic-stripping voltammetry (ASV) has been used in the derivative mode for the determination of cadmium, with a gold electrode in sulphuric add medium containing seleniurn(IV). The peak height for cadmium is enhanced by the presence of iodide. The sensitivity for cadmium is very high, with a peak in the stripping voltamperogram at -0.27V (vs. Ag/AgCl). The peak height for cadmium is not affected by over a 100-fold level of lead in the presence of selenium(IV). The dependence of peak height on the cadmium concentration is linear in the range 0.05-10ng ml .
Chunguo
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Institute of Environmental Chemistry, Academia Sinica, P.O. Box 934, Beijing, People's Republic of China.