盐城市近年来入海河流涉氮污染物特征分析  

Characteristics of Nitrogen Pollutants in Seaborne Rivers in Yancheng City in Recent Years

作　　者：吉祝美 马晶晶 季节 JI Zhumei;MA Jingjing;JI Jie(Jiangsu Yancheng Environmental Monitoring Center,Jiangsu Yangcheng 224000,China)

机构地区：[1]江苏省盐城环境监测中心,江苏盐城224000

出　　处：《广州化工》2024年第19期162-165,193,共5页GuangZhou Chemical Industry

摘　　要：研究以盐城入海河流水质中氮类污染物为研究对象分析相其污染特征,研究表明:盐城市入海河流氨氮浓度均达到地表水Ⅲ类水标准,总氮平均浓度高于湖库总氮标准Ⅴ类标准限值。在2018-2022年连续五年的评价时段内氨氮浓度具有显著下降趋势,总氮浓度指标呈一定的下降趋势,趋势不显著。盐城市入海河流总氮和氨氮月均值均具有春冬季氨总氮浓度水平高于夏秋季的季节性变化的特征。盐城市入海河流涉氮污染物中,硝态氮含量居三氮之首。入海河流总氮和氨氮浓度分布与近岸海域无机氮在时间上和空间上存在明显一致性,陆域污染物入海依然是近岸海域污染的主要来源。Nitrogen pollutants in the water quality of the ocean-flowing rivers of Yancheng City were taken as the research object to analyze the pollution characteristics.The results showed that the concentration of ammonia nitrogen in the ocean-flowing rivers of Yancheng City reached the Class III standard of surface water,and the average concentration of total nitrogen was higher than the ClassⅤstandard of the total nitrogen standard of the lake and reservoir.During the evaluation period of five consecutive years from^(2)018 to 2022,the ammonia nitrogen concentration showed a significant downward trend,while the total nitrogen concentration index showed a certain downward trend,but the trend was not significant.The monthly mean values of total nitrogen and ammonia nitrogen in the seaque-flowing rivers of Yancheng City showed that the concentration of total ammonia nitrogen in spring and winter was higher than that in summer and autumn.The content of nitrate nitrogen was the first among the three nitrogen pollutants in rivers entering the sea in Yancheng City.The concentration distribution of total nitrogen and ammonia nitrogen in seaward rivers was obviously consistent with inorganic nitrogen in coastal waters in time and space,and pollutants from land into the sea were still the main source of pollution in coastal waters.

关 键 词：涉氮污染物 盐城市 入海河流 近岸海域 无机氮 

分 类 号：X522[环境科学与工程—环境工程]