Hassan Khalid Mahmoud, Hathoot Abla Ahmed, Abo Oura Mohamed Fathi, Azzem Magdi Abdel
Chemistry Research Laboratory, Physics and Mathematics Engineering Department, Faculty of Electronic Engineering, Menoufia University Egypt
Electrochemistry Laboratory, Chemistry Department, Faculty of Science, Menoufia University Egypt.
RSC Adv. 2018 Feb 7;8(12):6346-6355. doi: 10.1039/c7ra13665j. eCollection 2018 Feb 6.
The electrochemical behavior of phenolic isomers hydroquinone (HQ), catechol (CC) and resorcinol (RC) was examined in poly(1,5-diaminonaphthalene)/glassy carbon-modified electrode (P1,5-DAN/GC M.E.) by cyclic voltammetry (CV), square wave voltammetry (SWV) and chronoamperometry (CA) techniques in perchloric acid (HClO) and phosphate buffer solution (PBS, pH 7.0). P1,5-DAN/GC M.E. was investigated for simultaneous determination of HQ, CC and RC in single, binary and ternary systems. Oxidation peak potentials were negatively shifted with increasing oxidation peak current for HQ, CC and RC at P1,5-DAN/GC M.E. compared with bare GC electrode. The obtained results illustrate that the former electrode exhibits better performance towards the three isomers in PBS rather than in HClO solution. The catalytic currents for different concentrations of HQ, CC and RC showed good relationship in the range of 0.1-100 μM for all analytes and low detection limits (LOD) of 0.034, 0.059 and 0.14 μM for them, respectively, in a ternary system in PBS at pH 7.0. This method has been practically applied for the detection of these isomers in tap water with acceptable results.
采用循环伏安法（CV）、方波伏安法（SWV）和计时电流法（CA）技术，在高氯酸（HClO）和磷酸盐缓冲溶液（PBS，pH 7.0）中，研究了对苯二酚（HQ）、邻苯二酚（CC）和间苯二酚（RC）这三种酚类异构体在聚（1,5-二氨基萘）/玻碳修饰电极（P1,5-DAN/GC M.E.）上的电化学行为。对P1,5-DAN/GC M.E.进行了研究，用于同时测定单一组分、二元体系和三元体系中的HQ、CC和RC。与裸玻碳电极相比，在P1,5-DAN/GC M.E.上，HQ、CC和RC的氧化峰电位随着氧化峰电流的增加而负移。所得结果表明，对于这三种异构体，前一种电极在PBS中比在HClO溶液中表现出更好的性能。在pH 7.0的PBS三元体系中，不同浓度的HQ、CC和RC的催化电流在所有分析物的0.1 - 100 μM范围内呈现良好的关系，其检测限分别低至0.034、0.059和0.14 μM。该方法已实际应用于自来水中这些异构体的检测，结果令人满意。
