某河流入海段氨氮、总磷和总氮浓度变化特征及相关性分析

根据某河流入海段2020年10月至2021年10月氨氮、总磷和总氮的月度水质监测数据,分析了水体污染程度及变化特征,研究了各因子间相关性.结果表明,基于氨氮、总磷监测数据,入境断面水质类别为Ⅱ、Ⅲ类,首要污染因子中氨氮占比90％;出境断面水质类别为Ⅰ、Ⅱ类,首要污染因子中氨氮占比70％.氨氮与总氮比值变化趋势与水质指数...

Variation Characteristics and Correlation Analysis of Ammonia Nitrogen,Total Phosphorus and Total Nitrogen Concentrations in the Section of a River Entering the Sea

According to the monthly monitoring data of ammonia nitrogen,total phosphorus and total nitrogen from October 2020 to October 2021 in the section of the river entering the sea,the pollution degree and change characteristics are analyzed,and the correlation between the factors is studied.The results show that based on the monitoring data of ammonia nitrogen and total phosphorus,the water quality of the entry section is classified as II and III,and ammonia nitrogen accounts for 90%of the primary pollution factor;the water quality of the exit section is classified as I and II,and the primary pollution factor accounts for 70%of the ammonia nitrogen.The change trend of the ratio of ammonia nitrogen to total nitrogen is highly consistent with the change trend of the water quality index.both indicate that the water quality of exit section in other months is significantly better than that of entry section,except for August 2021,which is basically the same.The concentrations of ammonia nitrogen,total phosphorus,and total nitrogen in the exit section were not higher than those in the entry section in each month,and the average monthly reduction rate of total phosphorus was the highest.The degree of eutrophication in the exit section is significantly lower than that in the entry section,and the risk of water blooms is lower.There is a significant correlation between total phosphorus and ammonia nitrogen in entry section,and total nitrogen and total phosphorus in exit section.