西凉湖、黄盖湖和陆水水库高锰酸盐指数与化学需氧量的相关性分析

Correlation Analysis Between Permanganate Index and Chemical Oxygen Demand in Xiliang Lake,Huanggai Lake and Lushui Reservoir

地表水中的高锰酸盐指数和化学需氧量是地表水环境监测中的重要指标。以咸宁市内有代表性的湖库西凉湖、黄盖湖和陆水水库为例,将它们2020年1月至2021年12月的高锰酸盐指数和化学需氧量月均值数据分别进行了相关性分析,通过相关系数分析和F检验,结果表明:西凉湖、黄盖湖和陆水水库各断面的高锰酸盐指数与化学需氧量显著相关,同时在分析过程中发现西凉湖、黄盖湖和陆水水库及它们内部不同断面之间高锰酸盐指数与化学需氧量的线性关系并不完全相同。因此,不能用某个断面高锰酸盐指数和化学需氧量的线性方程来代表其他断面高锰酸盐指数和化学需氧量的关系。对同一监测断面,可以通过高锰酸盐指数并利用其与化学需氧量的一元线性回归方程估算出化学需氧量,既可节约时间,又可降低化学需氧量分析时产生的重金属二次污染;在审核数据时也可利用其中一个指标的值来估算另一个指标的范围,从而判断这2个监测指标数据的合理性。

Permanganate index and chemical oxygen demand of surface water are important indicators in the environmental monitoring.In this paper,the representative lakes in Xianning,such as Xiliang Lake,Huanggai Lake and Lushui Reservoir are taken as an example.The correlation between permanganate index and chemical oxygen demand of monthly average data from January 2020 to December 2021 is analyzed.Through the analysis of correlation coefficient and F-test,it shows that permanganate index is significantly correlated with chemical oxygen demand about Xiliang Lake,Huanggai Lake and Lushui Reservoir.At the same time,it is found that the linear relationship between permanganate index and chemical oxygen demand is not exactly the same in Xiliang Lake,Huanggai Lake and Lushui Reservoir and different sections within them is not exactly the same.Therefore,a linear equation of permanganate index and chemical oxygen demand about one section cannot be represented the other section.For the same monitoring section,chemical oxygen demand can be estimated by using permanganate index and its linear regression equation between chemical oxygen demand,which can save time and reduce the secondary pollution of heavy metals in chemical oxygen demand analysis.One indicator can also be used to estimate the range of the other indicator,which can judge the reasonableness of the two monitoring indicator data.