【摘要】 根据无α－ Ｈ 的醛在高浓度ＮａＯＨ的作用下发生歧化反应（康尼．查罗反应）的原理，采用高锰酸钾滴定乙醛酸在ＮａＯＨ作用下发生歧化反应生成的草酸，通过计算得到乙醛酸的含量。利用本法测定了由氯乙酸氧化制得的乙醛酸水溶液中乙醛酸的含量。测定相对误差０ ％ ～０．２６ ％ ，加标回收率＞ ９０ ％ ，操作简单，准确度良好。更多还原

【Abstract】 Oxalic acid which was produced by the disproportionation of glyoxylic acid in the present of NaOH was titrated by KMnO 4.The content of glyoxylic acid could be obtained through calculation.This method was based on cannizarros reaction.The method has been used to determine glyoxylic acid in the aqueou solution with high accuracy and simple operation.The relative error of result was 0%~0.26%,recovery >90%.更多还原