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首页> 外文期刊>Electroanalysis >A Simple and Highly Sensitive Electrochemically Reduced p-Nitrobenzoic Acid Film Modified Sensor for Determination of Mercury
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A Simple and Highly Sensitive Electrochemically Reduced p-Nitrobenzoic Acid Film Modified Sensor for Determination of Mercury

机译：一种简单而灵敏的电化学还原对硝基苯甲酸膜修饰传感器，用于测定汞

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摘要

Herein, a simple electrochemical sensor was fabricated for sensing Hg~(2+) ions by using electrochemically reduced p-nitrobenzoic acid molecules modified (ERpNBA) glassy carbon electrode (GCE). The modified electrode was applied for the determination of Hg~(2+) ions by using differential pulse anodic stripping voltammetry (DPASV). Experimental parameters such as concentration of p-nitrobenzoic acid used for electrode modification, pH, accumulation time and deposition potential used for the determination of Hg~(2+) ions were optimized. The strong interaction between the Hg2+ ions and the lone pair of electrons on the nitrogen atoms of ERpNBA molecules leads to highly selective adsorption of Hg~(2+) ions on the modified electrode. Under the optimum experimental conditions, the sensor showed higher sensitivity and very low detection limit for Hg~(2+) ions than other metal ions such as Cd~(2+), Pb~(2+) and Zn~(2+) ions. The LOD for Hg~(2+) ions was 240 pM which is below the guideline value given by the World Health Organization and the earlier reports.
机译：在此，通过使用电化学还原的对硝基苯甲酸分子修饰的（ERpNBA）玻碳电极（GCE），制造了一种用于检测Hg〜（2+）离子的简单电化学传感器。采用微分脉冲阳极溶出伏安法（DPASV）将修饰电极应用于Hg〜（2+）离子的测定。优化了用于修饰电极的对硝基苯甲酸的浓度，pH，累积时间和用于测定Hg〜（2+）离子的沉积电势等实验参数。 Hg2 +离子与ERpNBA分子氮原子上的孤对电子之间的强相互作用导致修饰电极上Hg〜（2+）离子高度选择性吸附。在最佳实验条件下，该传感器对Hg〜（2+）离子的灵敏度高于对Cd〜（2 +），Pb〜（2+）和Zn〜（2+）等金属离子的检测限。离子。 Hg〜（2+）离子的LOD为240 pM，低于世界卫生组织和较早的报告给出的指导值。

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