南京大胜关水质自动监测与人工监测比对分析

Comparative study of automatically and manualy monitored water quality of Dashengguan Station in Nanjing

为了系统研究水质自动监测数据与实验室人工监测数据的差异,以南京大胜关水质自动监测站为研究对象,选取水温、pH、溶解氧、氨氮、总磷、总氮、高锰酸盐指数、浊度、电导率等9个项目,分别进行了自动监测和人工监测数据的对比实验研究。监测数据的相对误差、地表水评价类别分析表明:高锰酸盐指数、总磷、总氮的人工监测数值较自动监测数值偏小,氨氮则偏大。两种方法测得的总氮及高锰酸盐指数存在显著性差异。高锰酸盐指数、总氮、总磷的自动监测与人工监测结果所反映的水质类别基本一致。自动监测结果可为该断面水质评价提供定性参考,而定量判断必须基于实验室标准方法监测结果。

To systematically analyze the difference between manualy and automatically monitored water quality da⁃ta,the comparative study of 9 indexes(temperature,pH,DO,NH3-N,TP,TN,CODMn,turbidity,conductivity,etc.)of water quality of Dashengguan Station in Nanjing measured by manual and automatic monitoring were con⁃ducted in laboratory.The analysis of the relative error and groundwater quality grade shows that manualy measured CODMn,TP and TN are smaller than automatically measured data,and the manualy measured NH3-N is larger.There are significant differences between the two methods in measuring TN and CODMn.But the water quality grade reflected by CODMn,TN and TP obtained by the two methods are basically the same.The automatically monitored data can be referenced in qualitative analysis of water quality of this station,while the quantitative analysis should be based on Laboratoral Standard Monitoring.