Sensitive and Green Method for Determination of Chemical Oxygen Demand Using a Nano-copper Based Electrochemical Sensor,Electroanalysis

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Sensitive and Green Method for Determination of Chemical Oxygen Demand Using a Nano-copper Based Electrochemical Sensor
Electroanalysis ( IF 2.7 ) Pub Date : 2017-07-25 , DOI: 10.1002/elan.201700219
Ibrahim H. A. Badr ₁ , Hamdy H. Hassan ₁ , E. Hamed ₁ , Ali M. Abdel-Aziz ₁

Affiliation

Copper nanoparticles (nano-Cu) were electrodeposited on the surface of glassy carbon electrode (GCE) potentiostatically at −0.6 V vs. Ag/AgCl for 60 s. The developed nano-copper modified glassy carbon electrode (nano-Cu/GCE) was optimized and utilized for electrochemical assay of chemical oxygen demand (COD) using glycine as a standard. The surface morphology and chemical composition of nano-Cu/GCE were investigated using scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX), respectively. The electrochemical behavior was investigated using linear sweep voltammetry (LSV) which is characterized by a remarkable anodic peak at ∼0.6 V, compared to bare GCE. This indicates that nano-Cu enhances significantly the electrochemical oxidation of glycine. The effect of different deposition parameters, such as Cu2+ concentration, deposition potential, deposition time, pH, and scan rate on the response of the developed sensor were investigated. The optimized nano-Cu/GCE based COD sensor exhibited a linear range of 15 to 629.3 ppm, and a lower limit of detection (LOD) of 1.7 ppm (S/N=3). This developed method exhibited high tolerance level to chloride ion (0.35 M chloride ion has minimal influence). The analytical utility of the prepared COD sensor was demonstrated by investigating the COD recovery (99.8±4.3) and the assay of COD in different water samples. The results obtained were verified using the standard dichromate method.

中文翻译：

使用纳米铜基电化学传感器测定化学需氧量的灵敏、绿色方法

铜纳米颗粒（纳米铜）在-0.6 V vs. Ag/AgCl 下恒电位电沉积在玻碳电极（GCE）的表面上 60 秒。开发的纳米铜修饰玻碳电极（纳米铜/GCE）被优化并用于以甘氨酸为标准的化学需氧量（COD）的电化学测定。分别使用扫描电子显微镜 (SEM) 和能量色散 X 射线光谱仪 (EDX) 研究了纳米 Cu/GCE 的表面形貌和化学成分。使用线性扫描伏安法 (LSV) 研究电化学行为，与裸 GCE 相比，LSV 的特征是在 ~0.6 V 处有一个显着的阳极峰。这表明纳米铜显着增强了甘氨酸的电化学氧化。不同沉积参数的影响，如 Cu2+ 浓度，研究了沉积电位、沉积时间、pH 值和扫描速率对所开发传感器的响应。优化的基于纳米 Cu/GCE 的 COD 传感器的线性范围为 15 至 629.3 ppm，检测下限 (LOD) 为 1.7 ppm (S/N=3)。这种开发的方法对氯离子具有很高的耐受性（0.35 M 氯离子的影响最小）。通过研究 COD 回收率 (99.8±4.3) 和不同水样中的 COD 测定，证明了制备的 COD 传感器的分析效用。使用标准重铬酸盐方法验证获得的结果。7 ppm (S/N=3)。这种开发的方法对氯离子具有很高的耐受性（0.35 M 氯离子的影响最小）。通过研究 COD 回收率 (99.8±4.3) 和不同水样中的 COD 测定，证明了制备的 COD 传感器的分析效用。使用标准重铬酸盐方法验证获得的结果。7 ppm (S/N=3)。这种开发的方法对氯离子具有很高的耐受性（0.35 M 氯离子的影响最小）。通过研究 COD 回收率 (99.8±4.3) 和不同水样中的 COD 测定，证明了制备的 COD 传感器的分析效用。使用标准重铬酸盐方法验证获得的结果。

更新日期：2017-07-25

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