测定高锰酸盐指数仪器法和手工滴定法比对

Comparison Between Instrumental Method and Manual Titration Method for Determination of Permanganate Index

利用高锰酸盐指数全自动分析仪仪器法和传统手工滴定法对国家标准物质和实际水样进行分析,从检出限、准确度、精密度方面做比对,结果表明:高锰酸盐指数仪器法的检出限为0.28 mg/L,测定标准物质样品的相对误差-0.22%~0.14%;手工滴定法相对误差-4.88%~-4.05%。测定实际样品,仪器法和手工滴定法相对标准偏差分别为0.56%~1.44%,1.10%~3.22%。从显著性检验分析,全自动仪器法和手工滴定法样品测定结果有相同的精密度,但是两种方法测试结果的差异非常显著和较显著。仪器法测定结果精密度更高、准确度更好。

The national standard material and actual water samples were analyzed by the permanganate index automatic analyzer instrument method and the traditional manual titration method,and the detection limit,accuracy and precision were compared.The results show that the detection limit of permanganate index instrument method is 0.28 mg/L,the relative error of determination standard material sample is-0.22%~0.14%;the relative error of manual titration method is between-4.88%~-4.05%.The relative standard deviations of the instrument method and manual titration method were 0.56%~1.44%and 1.10%~3.22%,respectively,for the actual samples.From the analysis of significance test,the test results of the automatic instrument method and manual titration method have the same precision,but the difference between the test results of the two methods is very significant and more significant.The instrumental method has higher precision and better accuracy.