水质自动监测与常规监测结果对比分析

为了系统研究水质自动监测数据与常规监测数据间差异问题,选取15个运行多年的国家地表水水质自动监测站,对p H、溶解氧(DO)、高锰酸盐指数(COD_(Mn))、氨氮(NH_3-N)及总磷(TP)5项监测指标开展了站房外常规监测、站房内常规监测与自动监测的对比实验研究。通过分析监测结果之间相对误差、相对偏差、水质类别变化发现,站房内常规监测、站房外常规监测与自动监测结果之间误差较小;同时通过误差统计分析及直方图分析发现,地表水水质自动监测系统监测结果与站房外常规监测结果之间误差整体属于随机误差(偶然误差)。研究得到了水质自动监测与常规监测数据一致可比的结论,为水质自动监测数据的应用提供了实验基础。

Comparative Analysis of State Surface Water Quality by Automatic Monitoring and Laboratory Monitoring

Data (pH, DO, COD_Mn, NH₃-N and TP) of surface water quality from 15 state surface water quality automatic monitoring stations were used to systematically analyze the difference between laboratory monitoring of water samples outside the station, laboratory monitoring of water samples inside the station, and automatic online monitoring. It was found that the errors among them were small based on the analysis of relative error, relative deviation, and change of water quality grade. Through statistical analysis of errors and histogram, it was also found that the errors between laboratory monitoring data of water samples outside the station and the automatic online monitoring data were random errors (accidental errors), and they were consistent and comparable. Therefore, the basis for automatic online monitoring data to be applied widely was built.