纳米银/碳纳米管修饰玻碳电极直接电化学测定甲基对硫磷  

Voltammetric determination of methyl parathion with a nano-Ag/CNTs/GC electrode

作　　者：杨平华[1] 陈小艳[1] 万谦[1] 

机构地区：[1]九江学院化学化工学院,九江332005

出　　处：《分析试验室》2011年第4期81-85,共5页Chinese Journal of Analysis Laboratory

基　　金：江西省教育厅科技项目(GJJ09352)资助

摘　　要：基于制备的纳米银/碳纳米管复合材料构建了纳米银/碳纳米管修饰玻碳电极。循环伏安法与线性扫描伏安法研究了甲基对硫磷在修饰电极上的电化学行为,结果发现甲基对硫磷在修饰电极上有明显的电化学活性。考察了各种条件的影响,优化的最佳条件为:在0.1 mol/L的磷酸盐缓冲溶液中(pH7.0),预富集3 min,在-0.2～-0.8V间进行线性伏安扫描。在2×10-6～1×10-4mol/L浓度范围内,在-0.58V处的还原峰电流与甲基对硫磷浓度成正比。由此建立了直接测定甲基对硫磷的新方法并对实际水样进行测定。A nano-Ag/CNTs/GC electrode was fabricated with the new prepared nano-silver/carbon nanotubes composite materials.The electrochemical behaviors of methyl parathion at the modified electrode have been inspected by cyclic voltammetry and linear sweep voltammetry.It is found that the nano-Ag/CNTs/GC electrode showed excellent electrocatalysis toward the redox of methyl parathion.The impacts of experimental conditions were studied.The optimum conditions are in 0.1 mol/L phosphate buffer solution（pH7.0） with preconcentration time of 3 minutes in the potential range of-0.2^-0.8 V by linear sweep voltammetry.A linear relationship between the peak current at-0.58 V and the concentration of methyl parathion was obtained in the range of 2.0×10-6~1.0×10-4mol/L.A method for the voltammetric determination of methyl parathion with the nano-Ag/CNTs/GC electrode has been developed.Real water samples were analyzed and satisfactory results were obtained.

关 键 词：纳米银/碳纳米管修饰玻碳电极 甲基对硫磷 电化学测定 

分 类 号：O657.1[理学—分析化学]