Çanakkale Onsekiz Mart University, Science & Art Faculty, Department of Chemistry, 17100 Çanakkale, Turkey.
Talanta. 2012 Jan 30;89:490-5. doi: 10.1016/j.talanta.2011.12.074. Epub 2012 Jan 2.
This study describes a new approach for the investigation of electrocatalytic oxidation of sulfide using a pencil graphite electrode modified with quercetin (PGE/QH(2)). Adsorption procedure was used for the preparation of the modified electrodes. It was observed that PGE/QH(2) showed a significant electrocatalytic activity toward sulfide oxidation. Cyclic voltammetric studies show that the peak potential of sulfide shifts from +450 mV at bare PGE to +280 mV at PGE/QH(2). The electrocatalytic currents obtained from amperometric measurements at +300 mV vs. Ag/AgCl/KCl(sat) and at pH 8.0 BR buffer solution containing 0.1M NH(4)Cl were linearly related to the concentration of sulfide. The calibration graph consisted of two linear segments of 1-20 μM and 20-800 μM with a detection limit of 0.3 μM (based on 3s(b)). The proposed method was successfully applied to the determination of sulfide in waste waters and was compared with the spectrophotometric method.
本研究描述了一种使用槲皮素（PGE/QH(2)）修饰的铅笔石墨电极（PGE）来研究硫化物电化学氧化的新方法。吸附程序用于制备修饰电极。结果表明，PGE/QH(2)对硫化物氧化具有显著的电催化活性。循环伏安研究表明，硫化物的峰电位从裸 PGE 的+450 mV 移至 PGE/QH(2)的+280 mV。在+300 mV 相对于 Ag/AgCl/KCl(sat)和含有 0.1M NH(4)Cl 的 pH 8.0 BR 缓冲溶液中进行安培测量得到的电催化电流与硫化物的浓度呈线性关系。校准曲线由 1-20 μM 和 20-800 μM 两个线性段组成，检测限为 0.3 μM（基于 3s(b)）。该方法成功应用于废水中硫化物的测定，并与分光光度法进行了比较。
