In this study, poly(dopamine-quinone chromium (III))-microspheres (PDQCM) were used for the modification of graphite paste electrode (GPE) for simultaneous voltammetric determination of 4-Amino Phenol (AP), Phenol (Ph) and 4-Nitro Phenol (NP). The PDQCM and the GPE modified with PDQCM were characterized by field emission scanning electron microscopy, Energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, electrochemical impedance spectroscopy and electrochemistry methods such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The proposed modified electrode exhibits high electrocatalytic activity toward electrooxidation of AP, Ph, and NP to three well-separated peaks in the potential range from 0.2 to 1.3 V using CV and DPV methods in phosphate buffer solution with pH 2.0. Under the optimum conditions, detection limits of 0.5, 0.6 and 0.8 µM were obtained for AP, Ph, and NP, respectively. Moreover, GPE/PDQCM was successfully used for simultaneous determination of AP, Ph, and NP in tap and river waters.

在这项研究中，聚（多巴胺-醌铬（III））-微球（PDQCM）用于修饰石墨糊电极（GPE），用于同时测定4-氨基苯酚（AP），苯酚（Ph）和4的伏安法。 -硝基苯酚（NP）。通过场发射扫描电子显微镜，能量色散X射线光谱，傅立叶变换红外光谱，电化学阻抗谱和电化学方法（例如循环伏安法（CV）和微分脉冲伏安法（DPV））对PDQCM和修饰有PDQCM的GPE进行了表征。 。所提出的修饰电极在pH 2.0的磷酸盐缓冲溶液中使用CV和DPV方法对AP，Ph和NP的电氧化表现出高的电催化活性，使其在0.2至1.3 V的电位范围内达到三个良好分离的峰。在最佳条件下 AP，Ph和NP的检出限分别为0.5、0.6和0.8 µM。此外，GPE / PDQCM已成功用于同时测定自来水和河水中的AP，Ph和NP。