地表水自动监测与手工监测的对比研究

Comparative Study on Automatic Monitoring and Manual Monitoring of Surface Water

对江阴市64个水质断面,进行了高锰酸盐指数、氨氮、总磷、总氮4个污染物因子的手工监测和在线监测对比研究。结果表明:从比对合格率和相对偏差两个方面对自动监测与手工监测数据的统计分析,得出高锰酸盐指数、总磷、总氮的比对一致性高于氨氮,而造成此结果的主要原因是方法的不一致性,且气敏电极法测试低浓度氨氮时存在较大的误差。为此,提出了应选用合适的仪器或者参考使用低浓度的质控样代替实际水样进行比对实验。

In this paper,a comparative study of manual monitoring and online monitoring of four pollutant factors,namely,permanganate index,ammonia nitrogen,total phosphorus and total nitrogen,was carried out for 64 water quality cross-sections in Jiangyin.The results show that according to the statistical analysis of the automatic monitoring and manual monitoring data from the two aspects of the comparison pass rate and relative deviation,it is concluded that the comparison consistency of permanganate index,total phosphorus,total nitrogen is higher than that of ammonia nitrogen,and the main reason for this result is the inconsistency of the method.The gas-sensitive electrode method has large errors when testing low-concentration ammonia nitrogen.Appropriate instruments should be selected or a low-concentration quality control sample should be used instead of actual water samples for comparison experiments.