This article discusses the acidic potassium permanganate method of permanganate index from the following aspects: heating time, titrate temperature and titrate speed, end point of titration.
前言：文章对高锰酸盐指数加热时间、滴定温度、速度、滴定终点的控制进行了探讨。
Sodium formate from waste alkali liquor was analyzed by perchloric acid nonaqueous titration instead of potassium permanganate method, which caused larger deviation.
采用高氯酸非水滴定法分析废碱液中的甲酸钠，代替了误差较大的高锰酸钾法。
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