摘要
研究了典型中小城市滨州的不同功能区降雨径流中的氮污染特征及其对水体污染的影响。结果表明,滨州城区不同功能区降雨径流总无机氮(TIN)、氨氮、硝酸盐氮和亚硝酸盐氮质量浓度分别为0.22~10.19、0.01~1.73、0~6.61、0~1.84mg/L。部分降雨径流样品的TIN已经超过了《地表水环境质量标准》(GB 3838—2002)中总氮的Ⅴ类水体标准限值。各形态无机氮浓度在不同功能区存在显著差异。TIN浓度均值表现为:农业区>文教区>工业区>居住区>商业区>交通要道。降雨径流中的氮元素主要以硝酸盐氮形式存在。河流中TIN主要来自氨氮,其浓度水平与降雨径流相当。因此,降雨径流的氮污染对河流有重要影响,应引起重视。
Binzhou is a typical small-medium city in China.Nitrogen pollution characteristics of rainfall runoff and its impact on river water in different functional areas of Binzhou were investigated.Results showed that mass concentrations of total inorganic nitrogen(TIN),ammonia nitrogen(NH_4~+-N),nitrate nitrogen(NO_3~--N)and nitrite nitrogen(NO_2~--N)in rainfall runoff of Binzhou were 0.22~10.19,0.01~1.73,0~6.61,0~1.84 mg/L,respectively.TIN of several rainfall runoff samples had exceeded total nitrogen classⅤ standard of"Environmental quality standards for surface water"(GB 3838-2002).The forms of inorganic nitrogen in different functional areas had great difference.TIN average concentration revealed agricultural area>cultural area>industrial area>residential area>commercial area>transportation artery.The main nitrogen form in the rainfall runoff was NO_3~--N while that in river NH_4~+-N.The concentrations of TIN and NH_4~+-N in the river were at the same level as that in rainfall runoff,indicating that nitrogen pollution in rainfall runoff had significant inffluence on river water.
引文
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