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Interaction between Amorphous Zirconia Nanoparticles and Graphite: Electrochemical Applications for Gallic Acid Sensing Using Carbon Paste Electrodes in Wine

机译:非晶态氧化锆纳米粒子与石墨之间的相互作用:酒中碳糊电极在没食子酸感测中的电化学应用

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摘要

Amorphous zirconium oxide nanoparticles (ZrO ) have been used for the first time, to modify carbon paste electrode (CPE) and used as a sensor for the electrochemical determination of gallic acid (GA). The voltammetric results of the ZrO nanoparticles-modified CPE showed efficient electrochemical oxidation of gallic acid, with a significantly enhanced peak current from 261 µA ± 3 to about 451 µA ± 1. The modified surface of the electrode and the synthesised zirconia nanoparticles were characterised by scanning electrode microscopy (SEM), Energy-dispersive x-ray spectroscopy (EDXA), X-ray powdered diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). Meanwhile, the electrochemical behaviour of GA on the surface of the modified electrode was studied using differential pulse voltammetry (DPV), showing a sensitivity of the electrode for GA determination, within a concentration range of 1 × 10 mol L to 1 × 10 mol L with a correlation coefficient of R of 0.9945 and a limit of detection of 1.24 × 10 mol L (S/N = 3). The proposed ZrO nanoparticles modified CPE was successfully used for the determination of GA in red and white wine, with concentrations of 0.103 mmol L and 0.049 mmol L respectively.
机译:非晶态氧化锆纳米粒子(ZrO)首次用于修饰碳糊电极(CPE),并用作电化学测定没食子酸(GA)的传感器。 ZrO纳米粒子改性的CPE的伏安结果表明,没食子酸的有效电化学氧化,峰值电流从261 µA±3显着提高到约451 µA±1。电极的改性表面和合成的氧化锆纳米粒子的特征在于扫描电极显微镜(SEM),能量色散X射线光谱(EDXA),X射线粉末衍射(XRD)和傅立叶变换红外光谱(FTIR)。同时,使用微分脉冲伏安法(DPV)研究了GA在修饰电极表面的电化学行为,显示了该电极在1×10 mol L至1×10 mol L浓度范围内测定GA的灵敏度。 R的相关系数为0.9945,检出限为1.24×10 mol L(S / N = 3)。所建议的ZrO纳米粒子修饰的CPE已成功用于红酒和白酒中GA的测定,其浓度分别为0.103 mmol L和0.049 mmolL。

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