将石墨烯(GR)滴涂在玻碳电极(GCE)上制备GR/GCE电极,采用循环伏安法将离子液体(1-辛基-3-甲基咪唑六氟磷酸盐)聚合在GR/GCE电极表面,制得新型OM IM PF6/GR/GCE修饰电极.以0.1 mol/L HAc-NaAc缓冲溶液(pH 4.5)为支持电解液,利用差分脉冲法研究了Pb2+和Cd2+在OMIMPF6/GR/GCE电极上的电化学行为.结果表明,Pb2+和Cd2+在修饰电极上有较好的电化学行为,Pb2+和Cd2+的浓度分别在1.0×10-8~4.2×10-5 mol/L和1.0×10-8~6.0×10-5 mol/L范围内与峰电流呈良好的线性关系;Pb2+和Cd2+的检出限分别为1.0×10-9 mol/L和5.0×10-8 mol/L.实验方法用于矿石中铅和镉的测定,结果的相对标准偏差(RSD,n=6)为2.9%~4.4%;并与原子吸收光谱法对比,测定结果基本一致.
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 poly-merized 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 elec-trode 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 .T he 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 .T he proposed method w as 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 absorp-tion spectrometry (AAS) .
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