A very sensitive and selective procedure was developed for trace measurement of zirconium based on the cathodic adsorptive stripping voltammetry of the zirconium–alizarin red S(ARS) complex at a carbon paste electrode (CPE). The 2nd-order derivative linear scan voltammograms of the zirconium–ARS complex were recorded by a model JP-303 polarographic analyzer from 0.0 to −1.0 V (vs. SCE). Optimal analytical conditions were found to be: an acetic acid (0.1 mol l−1)–potassium biphthalate (0.08 mol l−1) buffer solution (pH 4.8) containing 4.0 × 10−6 mol l−1 ARS; accumulation potential, 0.0 V; accumulation time, 180 or 90 s; rest time, 10 s; scan rate, 250 mV s−1. The results showed that the complex can be adsorbed on the surface of the CPE, yielding one peak at −0.51 V, corresponding to the reduction of ARS in the complex at the electrode. The detection
limit was found to be 1.0 × 10−10 mol l−1 (S/N = 3) for 240 s accumulation. The linear range was 2.0 × 10−10–4.0 × 10−7 mol l−1. The developed method was applied to the determination of trace zirconium in the ore samples with satisfactory results.
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