碳纳米管修饰电极差分脉冲伏安法测定微量Pb<sup>2+</sup>

doi:10.13386/j.issn1002-0306.2012.18.021

碳纳米管修饰电极差分脉冲伏安法测定微量Pb²⁺

基金项目:

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)；

详细信息

中图分类号: O657.1;O614.433
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出版历程
- 收稿日期: 2012-03-04

Determination of trace Pb2+ by differential pulse voltammetry with carbon nanotube modified electrode

摘要

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。
- 铅; /
- 差分脉冲伏安法; /
- 碳纳米管; /
- 电化学传感;
Abstract: 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.
- lead;difference pulse voltammetry;carbon nanotube;electrochemical sensor; /
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