The factors that affect the determination of KMnO4 index by titration have been discussed, and the uncertainty in KMnO4 index measurement has been calculated.

• 本文对滴定法测定高锰酸盐指数的不确定度进行分析,找出影响不确定度的因素,对不确定度进行评估,如实反映测量的置信度和准确性。