A nanocarbon paste electrode modified with nitrogen-doped graphene for square wave anodic stripping voltammetric determination of trace lead and cadmium

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• 作者：Xinsheng Liu ; Zhaojun Li ; Runmei Ding ; Binbin Ren ; Yonghong Li
• 关键词：Electrochemical impedance spectroscopy ; Cyclic voltammetry ; Nyquist plot ; Hexacyanoferrate ; Lake water analysis
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：183
• 期：2
• 页码：709-714
• 全文大小：777 KB
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• 作者单位：Xinsheng Liu (1)
  Zhaojun Li (2)
  Runmei Ding (1)
  Binbin Ren (3)
  Yonghong Li (3)
  
  1. School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China
  2. School of Nursing, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China
  3. Electrochemistry and Spectroscopy Analysis Laboratory, School of Public Health and Management, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

A nano-carbon paste electrode was modified with nitrogen doped graphene and applied to square wave anodic stripping voltammetric determination of lead(II) and cadmium(II). The modified electrode was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. Key parameters affecting the performance of the sensor such as pH value, content of modifier, deposition potential and time were optimized. Under optimized conditions, the electrode exhibits linear response to lead (at about −0.56 V) and cadmium (at about −0.77 V) in the range between 10 pM to 1 nM, and the detection limits are 8.0 pM for cadmium(II) and 5.0 pM for lead(II), respectively. The sensitivity, selectivity and simplicity of the method are comparable to, or even better than those reported earlier.