Abstract：A sensitive electrochemical sensor based on graphene sheets(GS) and gold nano-particles(Au) modified carbon paste electrode(CPE) was fabricated(CPE│GS/Au). An electrochemical analysis method for the determination of trace lead in water by differential pulse stripping voltammetry(DPSV) was developed using this electrode as working electrode. Different technologies were employed to study the construction processes and electrochemical properties of the sensor. Under optimum experimental conditions, the stripping peak current showed good linear relationship with Pb2+ in the range of 2×10-10-5×10-8 g/mL(R2=0.999 0) with a detection limit of 1.2×10-10 g/mL. The relative standard deviation (RSD) was below 4.3%. The analytical results were comparable with graphite furnace atomic absorption spectrometry(GF-AAS) method. The proposed CPE has high surface activity due to the modification with composite nano-particles, which could amplify the response current. It also showed the merits of disposable design, low cost and good reproducibility compared with other Pb2+ sensors.
杨欣*，袁吉，满沛志，牛兴杰，郑甜. 纳米金-石墨烯修饰碳糊电极微分脉冲溶出伏安法检测水中铅[J]. 冶金分析, 2011, 31(7): 46-50.
YANG Xin*, YUAN Ji, MAN Pei-zhi, NIU Xing-jie, ZHENG Tian. Differential pulse stripping voltammetry determination of trace lead in water using Au-graphene sheets modified carbon paste electrode. , 2011, 31(7): 46-50.
