Optimization of simultaneous electrochemical determination of Cd(II), Pb(II), Cu(II) and Hg(II) at carbon nanotube-modified graphite electrodes
Optimization of simultaneous electrochemical determination of Cd(II), Pb(II), Cu(II) and Hg(II) at carbon nanotube-modified graphite electrodes
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DOI：
10.1080/10934529.2015.1019810
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
L. Pikna;M. Heželová;Z. Kováčová
中科院分区：
文献类型：
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作者：
L. Pikna;M. Heželová;Z. Kováčová
环境的健康状况每天都在恶化。有必要监测潜在的有毒元素和补救环境污染。因此，研究和开发简单、廉价、便携和有效的传感器具有重要意义。电化学是环境监测领域的有用组成部分。本研究的重点是评估和比较三种类型的电极（PIGE，PIGE/多壁碳纳米管/硝酸和PIGE/多壁碳纳米管/EDTA/硝酸）用于同时电化学测定四个潜在的有毒元素：镉（II），铅（II），铜（II）和汞（II）。在乙酸盐缓冲液中测量循环伏安图。计算了三个电极和每个测量元素的LOD、LOQ、方法的标准和相对精密度以及预测区间（根据技术程序DIN 32 645）。PIGE/CNT/HNO 3（具有最佳计算预测区间的电极）的LOD为：Cd（II）2.98 × 10−7 mol L− 1，Pb（II）4.83 × 10−7 mol L− 1，Cu（II）3.81 × 10−7 mol L−1，Hg（II）6.79 × 10−7 mol L−1。这项研究的好处之一是确定了其他元素混合物中汞（II）的含量。
The health of the environment is worsening every day. Monitoring of potentially toxic elements and remediation of environmental pollution are necessary. Therefore, the research and development of simple, inexpensive, portable and effective sensors is important. Electrochemistry is a useful component of the field of environment monitoring. The present study focuses on evaluating and comparing three types of electrodes (PIGE, PIGE/MWCNT/HNO3 and PIGE/MWCNT/EDTA/HNO3) employed for the simultaneous electrochemical determination of four potentially toxic elements: Cd(II), Pb(II), Cu(II) and Hg(II). Cyclic voltammograms were measured in an acetate buffer. The LOD, LOQ, the standard and relative precisions of the method and a prediction intervals were calculated (according to the technical procedure DIN 32 645) for the three electrodes and for each measured element. The LOD for PIGE/CNT/HNO3 (the electrode with narrowest calculated prediction intervals) was 2.98 × 10−7 mol L−1 for Cd(II), 4.83 × 10−7 mol L−1 for Pb(II), 3.81 × 10−7 mol L−1 for Cu(II), 6.79 × 10−7 mol L−1 for Hg(II). One of the benefits of this study was the determination of the amount of Hg(II) in the mixture of other elements.