地表水水样自然沉降放置试验与讨论

本文用四种方式对地表水样品的自然沉降在采样环节还是在分析环节进行实验,对BOD5、CODMn、CODcr之类分析时不需对样品进行预处理的项目有一定影响,自然沉降在分析环节的监测结果低于在采样环节的监测结果;对氨氮、总磷之类分析时需对样品进行预处理的项目影响几率基本持平。

The Test and Discussion of Naturally Settling Effect on Surface Water Sample

In this paper,four kinds of methods were used to test the effects of naturally settling on surface water samples in the procedure of both sampling and analysis.The results indicated that for those items which need not to be prepared,such as BOD_5,COD_(Mn) and COD_(Cr),naturally settling in analysis procedure produced lower analysis results than those in sampling procedure.But for the items which need to be prepared before analysis,such as Ammonium-nitrogen and Total phosphor,the effects were almost the same.