Abstract：The graphene (GR) dispersion was coated onto glass carbon electrode (GCE) to prepare GR/GCE electrode. The ionic liquid (1-octyl-3-methylimidazolium hexafluorophosphate, OMIMPF6) was polymerized on the surface of GR/GCE electrode by cyclic voltammetry to prepare the novel OMIMPF6/GR/GCE modified electrode. The electrochemical behaviors of Pb2+ and Cd2+ on OMIMPF6/GR/GCE electrode were studied by differential pulse voltammetry using 0.1 mol/L HAc-NaAc buffer solution (pH 4.5) as supporting electrolyte. The results showed that Pb2+ and Cd2+ had good electrochemical behaviors on the modified electrode. The concentration of Pb2+ and Cd2+ in range of 1.0×10-8-4.2×10-5 mol/L and 1.0×10-8-6.0×10-5 mol/L showed good linear relationship to the peak currents. The detection limit was 1.0×10-9 mol/L and 5.0×10-8 mol/L, respectively. The proposed method was applied to the determination of cadmium and lead in ore samples. The relative standard deviation (RSD,n=6) of determination results were between 2.9% and 4.4%. The found results were consistent with those obtained by atomic absorption spectrometry (AAS).
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