溴甲酚紫是一应用广泛的有机式剂。关于羟基三苯甲烷类染料的极谱研究报导不多。Ghoneim曾报导溴甲酚紫在pH<7时产生一个2电子还原波,当pH大于10时,可产生两个1电子还原波。Goel只研究了第一波的还原机理。本文用普通极谱、脉冲极谱、循环伏安等方法较详细地研究了溴甲酚紫的电还原。提出一电还原机理,解释了半波电位随pH变化的特殊规律。 Bromocresol purple is a widely used organic agent. Polarographic studies on hydroxytriphenylmethane dyes have not been reported. Ghoneim has reported that bromocresol purple produces a 2 electron reduction wave at pH <7 and produces two 1 electron reduction waves at pH> 10. Goel studied only the first wave of the reduction mechanism. In this paper, the common polarographic, pulse polarography, cyclic voltammetry and other methods to study in more detail the bromocresol purple electric reduction. An electroreduction mechanism is proposed to explain the special law of half-wave potential with pH.