石墨烯基纳米复合物修饰印刷电极伏安法测定水中镉

构建了基于石墨烯(GS) -纳米金(Au)复合纳米微粒修饰印刷电极(SPCEs)的电化学传感器(SPCEs |GS/Au),建立了微分脉冲溶出伏安(DPSV)法测定水中痕量镉的电分析方法.采用扫描电镜(SEM)对电极表面进行了表征,DPSV法研究了镉的电化学性质.在优化实验条件下,溶出峰电流与Cd2+的质量浓度在2.5...

Differential Pulse Stripping Voltammetry Determination of Cadmium in Water Using Graphene Sheets-Au Composite Nano-particles Modified Screen-printed Carbon Electrodes

An electrochemical sensor based on graphene sheets(GS) and gold nano-particles(Au) composite nano-particles modified screen-printed carbon electrodes(SPCEs) was fabricated(SPCEs│GS/Au),and an electrochemical method was developed for the determination of trace cadmium(Cd) in water by differential pulse stripping voltammetric(DPSV)method.Au preparation and the construction processes of SPCEs│GS/Au electrode were characterized by scanning electron micrography(SEM),and the electrochemical properties of Cd2+ were investigated.Under the optimum conditions,a good linear relationship was obtained between peak current and Cd2+ concentration in the range of 2.5×10-7-2.5×10-5 g/L(r2=0.998 0) with a detection limit(3σ) of 1.8×10-7 g/L.The method was applied in the determination of Cd2+ concentration in real water samples with recoveries of 96%-107%.The analytical results were consistent with those of the graphite furnace atomic absorption spectrometric(GF-AAS) method.The SPCEs│GS/Au electrode showed a high response current and an enrichment ability due to the modification of composite nano-particles.Therefore,the electrode was suitable for the determination of Cd2+ in water with advantages of disposable design,little sample consumption and simple operation.