提高化学需氧量比色分析精度的研究

Study on increasing accuracy of colorimetric analysis COD_(Cr)

CODCr化学分析因其分析速度快、能够反映废水有机污染的程度,在水质监测和废水处理过程中是一种必测和经常测定的指标。测定方法目前有很多种,常用的有滴定法、比色法等。滴定法技术成熟,结果可靠,是我国环境监测标准中规定的测试方法,但是测试过程仍然繁琐、费时、消耗试剂多;比色法测试速度快,方法简单,试剂用量少,但测试的结果有一定的误差。为此,文章针对提高比色法测定CODCr精度进行了研究,并与滴定法进行了同步测试和比较,结果表明,改进后的测试精度有了很大的提高。

COD(Cr) is a routine analysis index on water for quick and showing water organic pollution. The analyzed methods of COD(Cr) have mainly tow types,titration and colorimetric analysis. The titration is ripe in technology and accurate in result. For this reason,it is defined a standard method of environmental monitoring in China. But it needs more chemicals and wastes lots of time. However,the colorimetric analysis is fast,simple,and needs a few chemicals,but it's results is not accurate. A way of improvement colorimetric analysis'accuracy has been studied in this paper. The result shows its accuracy enhancing a lot.