CTAB化学吸附修饰电极线性扫描伏安法直接测定苯酚

Voltammetric Detection of Phenol at CTAB-modified Carbon Paste Electrode

本文提出了以十六烷基三甲基溴化铵(CTAB)修饰碳糊电极直接测定苯酚的电化学方法。在pH=8.0的0.1mol·L-1磷酸盐缓冲溶液中,苯酚在+0.63V出现一个灵敏的氧化峰,其峰电流与苯酚浓度在4.0×10-7～5.0×10-5mol·L-1之间呈线性关系,检出限为5.0×10-8mol·L-1。本文对CTAB对苯酚氧化的增敏机理进行了探讨。该电极用于工业废水中苯酚的检测,取得了满意的结果。

A new method for the determination of phenol with a CTAB modified carbon paste electrode was developed in this work. When the electrode potential swept from 0.20 to +1.00 V, a sensitive oxidation peak of phenol appeared at +0.63 V in 0.1 mol L^(-1) phosphate buffer (pH 8.0). The oxidation peak current had a linear relationship with phenol concentration in the range of 4.0×10^(-7)～(5.0)×10^(-5 )mol·L^(-1) and a low detection limit of 5.0×10^(-8) mol·L^(-1) was obtained (S/N=3). Mechanism for the electrochemical-oxidation of phenol and the enhancement effect of CTAB were investigated. This electrode was applied to the determination of phenol in industrial wastewater and the result was satisfactory.