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

被引：26

作者：

Liu, Xinsheng ^{[1
]}

Li, Zhaojun ^{[2
]}

Ding, Runmei ^{[1
]}

Ren, Binbin ^{[3
]}

Li, Yonghong ^{[3
]}

机构：

[1] Ningxia Med Univ, Sch Basic Med Sci, Yinchuan 750004, Peoples R China

[2] Ningxia Med Univ, Sch Nursing, Yinchuan 750004, Peoples R China

[3] Ningxia Med Univ, Sch Publ Hlth & Management, Electrochem & Spect Anal Lab, Yinchuan 750004, Peoples R China

来源：

MICROCHIMICA ACTA | 2016年 / 183卷 / 02期

关键词：

Electrochemical impedance spectroscopy; Cyclic voltammetry; Nyquist plot; Hexacyanoferrate; Lake water analysis; CARBON ELECTRODE; FILM ELECTRODE; DEPOSITION; OXIDE;

D O I：

10.1007/s00604-015-1713-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：709 / 714

页数：6

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