长江口原水中溶解性有机氮类化合物分析

Analysis on dissolved organic nitrogen (DON) in the raw water of Yangtze River Estuary

调查分析长江河口某水库原水中溶解性有机氮、溶解性无机氮、溶解性总氮等含量及其相关性、有机含氮水平、分子结构等指标,对于保证水源地水质具有重要意义,并可为水厂工艺优化提供依据。实地采样分析结果表明,长江河口原水中DIN是氮存在的主要形式,DON浓度含量较低,丰水期DON浓度和占TDN比例均高于枯水期;水库的自净作用使出水DON较进水降低。同时,长江河口原水的SUVA分析表明,水中有机物主要以亲水性小分子有机物为主。三维荧光光谱的平行因子分析表明,水库有机物主要为类腐殖酸、类色素有机物和类蛋白,其中,类蛋白成分是水体中有机氮类化合物的主要成分。

Investigation on total organic nitrogen （TDN） , dissolved inorganic nitrogen （DIN） and dissolved organic nitrogen （DON） of water in a reservoir in the Yangtze River estuary and analysis on their relationship, the indexes of organic nitrogen content and molecular structure etc. has important significance to guarantee the water quality in the Yangtze River estuary and provide the basis for technology optimization of water plant. The analysis results on measured data show that DIN is the major ni- trogen species in raw water of the Yangtze River estuary, whereas DON is the minor part, both DON concentration and the ratio of DON/TDN in flood season are higher than that in drought period ; self - purification of the reservoir can reduce DON concentra- tion in outflow; meanwhile, the SUVA analysis of raw water shows that hydrophilic small molecule organics are major part of or- ganics in water, the parallel analysis by three - dimensional excitation emission matrix shows that the major organics in the reser- voir are fulvic - acids like, pigment - like organics and protein - like, in which, protein - like is the major part of organic nitro- gen -like materials in water.