枝江市地表水水质氮素变化特征及标准限值研究  

Characteristics of Nitrogen Variation in Surface Water Quality and Standard Limit Values in Zhijiang City

作　　者：王杰 WANG Jie(Zhijiang Environmental Monitoring Station,Zhijiang 443200,China)

机构地区：[1]枝江市环境监测站,湖北枝江443200

出　　处：《水资源开发与管理》2025年第2期63-67,共5页Water Resources Development and Management

摘　　要：本文基于2019—2024年一季度枝江市饮用水水源地水质中氨氮、硝酸盐氮、总氮浓度及变化规律,分析氮素质量浓度、相互转化、排放之间时空变化情况,研究氮素污染防控规律,探索总氮排放限值。研究结果表明,氨氮在饮用水源氮素含量中占比均较低,满足现行Ⅱ类水质标准;在氨氮浓度一致的情况下,河流型水质因硝酸盐氮含量占比高,导致总氮高于湖库型;硝酸盐氮季节变化特点表现为春季—夏季—秋季—冬季依次为高—低—高—低波动的变化趋势。根据水质监测实际,建议调整总氮水质标准限值湖库Ⅱ类为1.0mg/L,河流Ⅱ类为2.0mg/L、Ⅲ类为4.0mg/L。Based on the concentrations and variation patterns of ammonia nitrogen,nitrate nitrogen,and total nitrogen in the water quality of drinking water sources in Zhijiang City from 2019 to the first quarter of 2024,this paper analyzes the spatial-temporal variations in nitrogen concentration,interconversion,and emissions.It explores the prevention and control of nitrogen pollution and examines the limits for total nitrogen emissions.The results indicate that ammonia nitrogen accounts for a relatively low proportion of nitrogen in drinking water sources,meeting the current Class Ⅱ water quality standards.In river-type water bodies,the total nitrogen is higher than in lake/reservoir-type water bodies due to the higher proportion of nitrate nitrogen.The seasonal variation of nitrate nitrogen shows a fluctuation pattern of high-low-high-low from spring to winter.Based on actual water quality monitoring,it is recommended to adjust the standard limits for total nitrogen in Class Ⅱ water quality to 1.0mg/L for lakes/reservoirs,2.0mg/L for rivers(Class Ⅱ),and 4.0mg/L for rivers(Class Ⅲ).

关 键 词：地表水 氮素 变化规律 标准限值 

分 类 号：TV213.4[水利工程—水文学及水资源]