Differential Pulse Stripping Voltammetric Determination of Cadmium(Ⅱ)in Liver and Kidney with Dithizone/Multi-Walled Carbon Nanotubes Modified Electrode

Differential pulse stripping voltammetry was applied to the determination of cadmium(Ⅱ) in liver and kidney using dithizone/multi-walled carbon nanotubes modified electrode. The optimized conditions were as follows:① pH of 0.1 mol·L-1 HOAc-NaOAc buffer solution(base solution):6.0;② amount of dithizone:3 μL;③ amount of multi-walled carbon nanotubes:10 μL;④ time of deposition:300 s;⑤ potential of deposition:-1.2 V;⑥ time of equilibration:40 s. The linear relationship between the peak currents and the concentration of cadmium(Ⅱ) was kept in definite ranges,with detection limit of 1.0×10-9mol·L-1. The proposed method was used for the measurement of liver and kidney samples,giving results in consistency with the values obtained by GFAAS with recovery rates in the range of 94.0%-108%.