Anodic stripping voltammetric measurement of trace cadmium at tin-coated carbon paste electrode

摘要

A carbon paste electrode modified with tin was used for the determination of trace cadmium by anodic stripping voltammetry. The electroanalytical performance for the determination of Cd(II) on the tin-coated carbon paste electrode(SnF-CPE) was better than that on the carbon paste electrode. The measuring conditions have been optimized. The measurement of trace cadmium on the SnF-CPE has the best response under the conditions of 0.10 mol L ~(-1) acetate buffer solution (pH 3.9), 3.5 mg L ~(-1) Sn(II), deposition potential of -1.40 V, and deposition time of 150 s. The SnF-CPE revealed highly linear behavior in the concentration range of 2.0-90.0 μg L ~(-1) with the detection limit of 1.13 μg L ~(-1) for Cd(II). The developed sensor has been applied to the determination of Cd(II) in real water samples with satisfactory results.