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首页> 外文期刊>Analytica chimica acta >Electrochemical sensors for the simultaneous determination of zinc, cadmium and lead using a Nafion/ionic liquid/graphene composite modified screen-printed carbon electrode
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Electrochemical sensors for the simultaneous determination of zinc, cadmium and lead using a Nafion/ionic liquid/graphene composite modified screen-printed carbon electrode

机译：使用Nafion /离子液体/石墨烯复合修饰丝网印刷碳电极同时测定锌，镉和铅的电化学传感器

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摘要

A simple, low cost, and highly sensitive electrochemical sensor, based on a Nafion/ionic liquid/graphene composite modified screen-printed carbon electrode (N/IL/G/SPCE) was developed to determine zinc (Zn(II)), cadmium (Cd(II)), and lead (Pb(II)) simultaneously. This disposable electrode shows excellent conductivity and fast electron transfer kinetics. By in situ plating with a bismuth film (BiF), the developed electrode exhibited well-defined and separate peaks for Zn(II), Cd(II), and Pb(II) by square wave anodic stripping voltammetry (SWASV). Analytical characteristics of the BiF/N/IL/G/SPCE were explored with calibration curves which were found to be linear for Zn(II), Cd(II), and Pb(II) concentrations over the range from 0.1 to 100.0 ng L-1. With an accumulation period of 120 s detection limits of 0.09 ng mL(-1), 0.06 ng L-1 and 0.08 ng L-1 were obtained for Zn(II), Cd(II) and Pb(II), respectively using the BiF/N/IL/G/ SPCE sensor, calculated as 3 sigma value of the blank. In addition, the developed electrode displayed a good repeatability and reproducibility. The interference from other common ions associated with Zn(II), Cd(II) and Pb(II) detection could be effectively avoided. Finally, the proposed analytical procedure was applied to detect the trace metal ions in drinking water samples with satisfactory results which demonstrates the suitability of the BiF/N/IL/G/SPCE to detect heavy metals in water samples and the results agreed well with those obtained by inductively coupled plasma mass spectrometry. (C) 2016 Elsevier B.V. All rights reserved.
机译：开发了一种基于Nafion /离子液体/石墨烯复合修饰丝网印刷碳电极（N / IL / G / SPCE）的简单，低成本，高灵敏度的电化学传感器，用于测定锌（Zn（II）），镉（Cd（II））和铅（Pb（II））同时出现。这种一次性电极具有出色的电导率和快速的电子转移动力学。通过用铋膜（BiF）进行原位电镀，通过方波阳极溶出伏安法（SWASV），发达的电极显示出Zn（II），Cd（II）和Pb（II）的明确且独立的峰。利用校准曲线探索了BiF / N / IL / G / SPCE的分析特性，发现该曲线对于Zn（II），Cd（II）和Pb（II）浓度在0.1至100.0 ng L范围内呈线性关系-1。在120 s的累积时间内，检测限为0.09 ng mL（-1），使用Zn（II），Cd（II）和Pb（II）分别获得0.06 ng L-1和0.08 ng L-1。 BiF / N / IL / G / SPCE传感器，计算为空白的3 sigma值。另外，显影的电极显示出良好的可重复性和可再现性。可以有效避免与Zn（II），Cd（II）和Pb（II）检测相关的其他常见离子的干扰。最后，所提出的分析程序用于饮用水样品中痕量金属离子的检测，结果令人满意，证明了BiF / N / IL / G / SPCE对检测水中样品中重金属的适用性，该结果与那些方法相吻合。通过电感耦合等离子体质谱法获得。 （C）2016 Elsevier B.V.保留所有权利。

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