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首页> 外文期刊>Electroanalysis >Voltammetric determination of 4-nitrophenol and 5-nitrobenzimidazole using different types of silver solid amalgam electrodes - a comparative study
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Voltammetric determination of 4-nitrophenol and 5-nitrobenzimidazole using different types of silver solid amalgam electrodes - a comparative study

机译：使用不同类型的银固体汞齐电极伏安法测定4-硝基苯酚和5-硝基苯并咪唑-对比研究

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摘要

The voltammetric behavior of two genotoxic nitro compounds (4-nitrophenol and 5-nitrobenzimidazole) has been investigated using direct current voltammetry (DCV) and differential pulse voltammetry (DPV) at a polished silver solid amalgam electrode (p-AgSAE), a mercury meniscus modified silver solid amalgam electrode (m-AgSAE), and a mercury film modified silver solid amalgam electrode (MF-AgSAE). The optimum conditions have been evaluated for their determination in Britton-Robinson buffer solutions. The limit of quantification (LQ) for 5-nitrobenzimidazole at p-AgSAE was 0.77μmolL-1 (DCV) and 0.47μmolL-1 (DPV), at m-AgSAE it was 0.32μmolL-1 (DCV) and 0.16μmolL-1 (DPV), and at MF-AgSAE it was 0.97μmolL-1 (DCV) and 0.70μmolL-1 (DPV). For 4-nitrophenol at p-AgSAE, LQ was 0.37μmolL-1 (DCV) and 0.32μmolL-1 (DPV), at m-AgSAE it was 0.14μmolL-1 (DCV) and 0.1μmolL-1 (DPV), and at MF-AgSAE, it was 0.87μmolL-1 (DCV) and 0.37μmolL-1 (DPV). Thorough comparative studies have shown that m-AgSAE is the best sensor for voltammetric determination of the two model genotoxic compounds because it gives the lowest LQ, is easier to prepare, and its surface can be easily renewed both chemically (by new amalgamation) and/or electrochemically (by imposition of cleaning pulses). The practical applicability of the newly developed methods was verified on model samples of drinking water.
机译：使用直流伏安法（DCV）和微分脉冲伏安法（DPV）在抛光的银固态汞合金电极（p-AgSAE）上研究了两种具有遗传毒性的硝基化合物（4-硝基苯酚和5-硝基苯并咪唑）的伏安行为修饰的银固体汞齐电极（m-AgSAE）和水银膜修饰的银固体汞齐电极（MF-AgSAE）。已在Britton-Robinson缓冲溶液中评估了确定它们的最佳条件。 5-硝基苯并咪唑在p-AgSAE的定量限（LQ）为0.77μmolL-1（DCV）和0.47μmolL-1（DPV），在m-AgSAE时为0.32μmolL-1（DCV）和0.16μmolL-1 （DPV），而在MF-AgSAE中为0.97μmolL-1（DCV）和0.70μmolL-1（DPV）。对于在p-AgSAE处的4-硝基苯酚，LQ为0.37μmolL-1（DCV）和0.32μmolL-1（DPV），在m-AgSAE处为0.14μmolL-1（DCV）和0.1μmolL-1（DPV），和在MF-AgSAE中为0.87μmolL-1（DCV）和0.37μmolL-1（DPV）。全面的比较研究表明，m-AgSAE是测定两种模型遗传毒性化合物的伏安法的最佳传感器，因为它具有最低的LQ，易于制备，并且其表面可以通过化学方法（通过新的合并）和/或化学方法轻松更新。或电化学方式（通过施加清洁脉冲）。在饮用水的模型样品上验证了新开发方法的实际适用性。

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