Abstract：The determination of trace lead is of great significance to the protection of human health. The cadmium telluride/graphene modified glassy carbon electrode (CdTe/GR/GCE) was prepared using CdTe quantum dot and GR. Then the content of trace lead in ore was determined by differential pulse voltammetry. The self-assembly time of modified electrode in CdTe solution was investigated by cyclic voltammetry curve. The optimum immersion time and enrichment time was 4h and 120s, respectively. The pH of HAc-NaAc buffer solution for determination was 5.0. Under the optimized conditions, the concentration of Pb2+ in range of 1.0×10-8-1.0×10-4 mol/L showed good linear relationship with its peak current. The correlation coefficient was 0.9922. The detection limit was 4.0×10-9 mol/L. 1.0×10-6 mol/L Pb2+ solution was determined according to the experimental method using five modified electrodes. The relative standard deviations (RSD, n=10) of determination results ranged from 2.9% to 4.0%. The found results were consistent with those obtained by atomic absorption spectrometry (AAS).
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