碳纳米管修饰电极差分脉冲伏安法测定微量Pb^(2+)  

Determination of trace Pb^(2+) by differential pulse voltammetry with carbon nanotube modified electrode

作　　者：王穗萍[1,2] 彭任富[1] 刘雷[1] 刘跃进[1] 杨武[1] 冯波[1] 

机构地区：[1]重金属污染控制湖南省高校重点实验室,湘潭大学化工学院,湖南湘潭411105 [2]淀粉与植物蛋白深加工教育部工程研究中心,华南理工大学,广东广州510630

出　　处：《食品工业科技》2012年第18期70-72,共3页Science and Technology of Food Industry

基　　金：湖南省教育厅一般项目(11C1209);湘潭大学自科科学基金项目(10XZX11);湘潭大学博士科研启动项目(11QDZ04);淀粉与植物蛋白深加工教育部工程研究中心开放课题(201108)

摘　　要：以碳纳米管(CNT)修饰玻碳电极为工作电极,于-1.0V吸附富集后差分脉冲伏安法测定水中微量铅离子,实验优化了支持电解质、pH、CNT用量。从富集电位正向扫描至0V,在-0.58V处产生铅的阳极溶出峰,溶出峰电流值与Pb2+浓度在0.005～1μg/mL范围内呈良好的线性关系,线性方程为y=16.0911x-0.2284(r=0.9962),检测下限为0.005μg/mL,回收率为95.4%～105.5%,6次重复测定RSD为1.69%。碳纳米管显著改善了铅离子检测信号,所提出的检测方法简单、灵敏、快速、选择性好,能应用于实际样品测定。An electrochemical sensor of Pb2＋ was constructed by modifing carbon nanotubes on the glassy carbon electrode.Pb2＋ was accumulated at-1.0V in the form of Pb.And then stripped by differential pulse voltammetry at-0.58V.The carbon nanotubes could significantly enhance the detection signal of Pb2＋.The amount of carbon nanotubes,pH and supporting electrolyte were optimized.Under the optimized experimental conditions,a linear range of 0.005 to 1μg/mL was obtained with the detection limit of 0.005μg/mL.The linear equation was y=16.0911x-0.2284（r=0.9962）.The reliability was investigated with satisfactory recovery from 95.4% to 105.5% for real samples.The reproducibility was investigated with a RSD of 1.69% for six measurements.The developed Pb2＋ sensor based on carbon nanotubes possesses advantages such as simple fabrication,fast response,low detection limit,good anti-interferential ability and reproducibility.

关 键 词：铅 差分脉冲伏安法 碳纳米管 电化学传感 

分 类 号：TS201.6[轻工技术与工程—食品科学]