酸性高锰酸盐指数法测定地表水样校准系数K值的探究  

The study on the Acid Permanganate index method for determining the calibration factor K value of surface water samples

作　　者：张宝军 ZHANG Baojun(Pingliang ecological Environmental monitoring center of Gansu Province,Pingliang Gansu 744000)

机构地区：[1]甘肃省平凉生态环境监测中心,甘肃平凉744000

出　　处：《天津化工》2025年第1期76-78,共3页Tianjin Chemical Industry

摘　　要：高锰酸钾溶液的校准系数K值的大小与空白值的影响、实际终点颜色的判断、标准溶液配制的准确性等因素有很大的关系。笔者探究发现草酸钠标准使用液配制过程中的稀释误差对高锰酸钾溶液的校准系数K值影响较大;滴定过程中,滴定终点颜色的判断要确保准确无误,样品滴定颜色深浅和标定过程中的颜色深浅最好一致,这样就能消除滴定过程中的操作误差,使测定结果准确性高;高锰酸钾试剂使用前按照标准方法 GB/T 11892-1989《水质高锰酸盐指数的测定》有必要进行提纯,草酸钠必须经过标准方法要求烘干处置后进行试剂配制。The size of the calibration coefficient K value of potassium permanganate solution is closely related to factors such as the influence of blank value,the judgment of actual endpoint color,and the accuracy of standard solution configu-ration.The author found that the dilution error during the preparation process of sodium oxalate standard solution has a sig-nificant impact on the calibration coefficient K value of potassium permanganate solution;During the titration process,the determination of the endpoint color should be accurate and error free.It is best for the color depth of the sample titration to be consistent with that of the calibration process.This can eliminate operational errors during the titration process and im-prove the accuracy of the measurement results;It is necessary to purify potassium permanganate reagent according to the standard method GB/T 11892-1989 before use.Sodium oxalate must be dried and disposed of according to the standard method requirements before reagent preparation.

关 键 词：高锰酸盐指数法 校准系数K值 草酸钠 高锰酸钾 

分 类 号：TQ016[化学工程]