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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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Abstract

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.

Schematic presentation showing that the modified CPE possesses much faster electron transfer ability. Charge transfer resistance values are shown for (a) a traditional carbon paste electrode (CPE); (b) a nano-carbon paste electrode; and (c) a nano-carbon paste electrode modified with nitrogen-doped graphene

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Acknowledgments

This research was supported by Ningxia Medical University Scientific Research Project (No. XM201415 and No. XZ2015002).

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Authors and Affiliations

  1. School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China

    Xinsheng Liu & Runmei Ding

  2. School of Nursing, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China

    Zhaojun Li

  3. Electrochemistry and Spectroscopy Analysis Laboratory, School of Public Health and Management, Ningxia Medical University, Yinchuan, 750004, People’s Republic of China

    Binbin Ren & Yonghong Li

Authors
  1. Xinsheng Liu
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  2. Zhaojun Li
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  3. Runmei Ding
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  4. Binbin Ren
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  5. Yonghong Li
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Corresponding authors

Correspondence to Xinsheng Liu or Yonghong Li.

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Liu, X., Li, Z., Ding, R. et al. A nanocarbon paste electrode modified with nitrogen-doped graphene for square wave anodic stripping voltammetric determination of trace lead and cadmium. Microchim Acta 183, 709–714 (2016). https://doi.org/10.1007/s00604-015-1713-3

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  • DOI: https://doi.org/10.1007/s00604-015-1713-3

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