Voltammetric determination of ofloxacin by using a laser-modified carbon glassy electrode,Microchimica Acta

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Voltammetric determination of ofloxacin by using a laser-modified carbon glassy electrode
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-01-01 , DOI: 10.1007/s00604-019-4065-6
Limin Feng _{1,

2} , Qiang Xue ₁ , Fei Liu ₁ , Qipu Cao ₃ , Jijun Feng ₃ , Liang Yang ₄ , Fuling Zhang ₄

Affiliation

A novel electrochemical sensor is described for the determination of ofloxacin (OFL) in environmental water samples. A laser-modified glassy carbon electrode (LGCE) was structured and characterized by scanning electron microscopy, atomic force microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. The increase in electrochemical activity is due to a moderate increase in the surface roughness and to the presence of functional groups on the LGCE. Under optimal conditions (viz. a pH value of 5.5, a laser power of 1.8 W and an action time of 40 s), the sensor is capable of detecting OFL by differential pulse voltammetry at a working potential of +0.91 V (versus Ag/AgCl). Response is linear from 0.25 to 200 μM for OFL concentration range, and the detection limit is 75 nM (at S/ N = 3). Removal of oxygen from samples is not required. The sensor was successfully applied to the determination of OFL in spiked groundwater, tap water and wastewater samples, with apparent recoveries from 94.0 to 108.0% and a relative standard deviation of less than 4.8%.” Graphical abstract Schematic representation of a method for determination of ofloxacin (OFL) by differential pulse voltammetry. It is making use of a laser modified glassy carbon electrode (LGCE), which increases the number of active functional groups and the surface area compared to a conventional GCE.

中文翻译：

激光修饰碳玻电极伏安法测定氧氟沙星

描述了一种用于测定环境水样中氧氟沙星 (OFL) 的新型电化学传感器。通过扫描电子显微镜、原子力显微镜、X 射线衍射、X 射线光电子能谱和电化学阻抗谱对激光改性玻璃碳电极 (LGCE) 进行了结构化和表征。电化学活性的增加是由于表面粗糙度的适度增加和 LGCE 上官能团的存在。在最佳条件下（即 pH 值为 5.5，激光功率为 1.8 W，作用时间为 40 s），该传感器能够通过差分脉冲伏安法在 +0.91 V（相对于 Ag/氯化银）。对于 OFL 浓度范围，响应在 0.25 到 200 μM 之间呈线性，检测限为 75 nM（在 S/N = 3 时）。不需要从样品中去除氧气。该传感器成功应用于测定加标地下水、自来水和废水样品中的 OFL，表观回收率从 94.0% 到 108.0%，相对标准偏差小于 4.8%。” 图形摘要通过差分脉冲伏安法测定氧氟沙星 (OFL) 的方法的示意图。它利用激光改性玻璃碳电极 (LGCE)，与传统 GCE 相比，它增加了活性官能团的数量和表面积。” 图形摘要一种通过差分脉冲伏安法测定氧氟沙星 (OFL) 的方法的示意图。它利用激光改性玻璃碳电极 (LGCE)，与传统 GCE 相比，它增加了活性官能团的数量和表面积。” 图形摘要一种通过差分脉冲伏安法测定氧氟沙星 (OFL) 的方法的示意图。它利用激光改性玻璃碳电极 (LGCE)，与传统 GCE 相比，它增加了活性官能团的数量和表面积。

更新日期：2020-01-01

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