地表水溶解氧与化学需氧量、高锰酸盐指数的关系探究

化学需氧量和高锰酸盐指数常被作为水体受有机污染物和还原性无机物质污染程度的综合指标,化学需氧量和高锰酸盐指数均以氧的mg/L表示。溶解氧是指溶解在水中的分子态氧,用每升水里氧气的毫克数表示。水体受有机、无机还原性物质污染时溶解氧降低。水中溶解氧的含量亦可以作为衡量水体受污染程度的指标。通过在长江上选取几个代表性断面,对水质监测数据进行拟合,建立溶解氧与高锰酸盐指数、溶解氧与化学需氧量的回归方程,得到一元线性回归方程y和相关系数R。在一定的检验水平下,判断溶解氧与高锰酸盐指数、溶解氧与化学需氧量是否存在线性相关,为水质数据分析和综合评价提供参考。

Chemical oxygen demand(COD) and permanganate index(PI) are often used as comprehensive indicators of water pollution by organic pollutants and reducing inorganic substances. Both COD and PI are expressed in mg/L of oxygen. Dissolved oxygen(DO) is the molecular oxygen dissolved in water,expressed in milligrams of oxygen per litre of water. When the water body is polluted by organic and inorganic reducing substances,the dissolved oxygen decreases. The content of dissolved oxygen in water can also be used as an indicator to measure the degree of water pollution. In this study,by selecting several representative sections on the Yangtze River and fitting the water quality monitoring data,the regression equations of dissolved oxygen and permanganate index,dissolved oxygen and chemical oxygen demand are established,and the one-dimensional linear regression equation y and correlation coefficient R are obtained. At a certain test level,judge whether there is linear correlation between dissolved oxygen and permanganate index,dissolved oxygen and chemical oxygen demand,and provide reference for water quality data analysis and comprehensive evaluation.