金电极上苯二酚异构体的电化学性质及同时测定

Electrochemical Properties and Simultaneous Determination of Catechol,Resorcinol and Hydroquinone on Gold Electrode

采用循环伏安法研究了邻苯二酚(CAT)、间苯二酚(RE)和对苯二酚(HQ)在0.5 mol/L硫酸水溶液中的电化学行为,循环伏安法和差分脉冲伏安法研究了CAT、RE和HQ共存体系的伏安行为。实验结果表明,在pH=0的硫酸水溶液中,扫描速率为10 mV/s,循环伏安法扫描电位在0～1.2 V(vs.Ag/Cl)时,分离效果明显。本文采用差分脉冲伏安法,测定了CAT、RE和HQ的混合物,检出限依次为3.9×10-6、3.9×10-6和7.8×10-6mol/L。将该方法用于合成样品测定,其精密度和准确度均满足分析要求。

Electrochemical behaviors of catechol （ CAT ）, resorcinol （ RE ） and hydroquinone （ HQ ） in 0. 5 mol/L sulfuric acid aqueous solution were studied using cyclic vohammetry. Vohammetric behaviors of CAT, Re and HQ in the coexisting system were studied using cyclic vohammetry and differential pulse voltammetry method. The results show that obvious separation effect is achieved under conditions of pH = 0 （ sulfuric acid ） , scan rate of 10 mV/s, and scan potential of 0 - 1.2 V （ vs. Ag/Cl ）. Under optimal conditions, the detection limit was 3.9 × 10^-6, 3.9 × 10^-6 and 7.8 × 10^-6 mol/L for CAT, RE, and HQ, respectively, in mixture of three substances using differential pulse vohammetry. The method is applied in the analysis of synthesized samples, and the accuracy and precision well satisfy the requirements of the analysis.