Quantitative analysis of source and fate of N-nitrosamines and their precursors in an urban water system in East China.
Quantitative analysis of source and fate of N-nitrosamines and their precursors in an urban water system in East China.
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DOI：
10.1016/j.jhazmat.2021.125700
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发表时间：
2021-03
影响因子：
13.6
通讯作者：
Yu Qiu;Er Bei;Xiao Li;Shuguang Xie;Hao Xiao;Yihua Luo;Yu Wang;Jun Wang;Xiao-jian Zhang;Chao Chen
中科院分区：
文献类型：
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作者：
Yu Qiu;Er Bei;Xiao Li;Shuguang Xie;Hao Xiao;Yihua Luo;Yu Wang;Jun Wang;Xiao-jian Zhang;Chao Chen
本文首次在城市层面定量研究了n -亚硝胺及其前体的形成势（FP）来源和去向。对长江三角洲某市亚硝胺及其前体的不同来源进行了调查。城市下游水源中n -亚硝基二甲胺（NDMA）含量为8.4 ng/L， NDMA FP含量为153 ng/L。根据浓度、河水通量和废水排放量对各排放源的贡献进行了评价。纺织印染废水和电镀工业废水中亚硝胺含量较高，是重要的排放源。考虑光解和生物降解对NDMA和NDMA FP的衰减，质量负荷计算表明，上游地表水向下游水源水带来的NDMA和NDMA FP分别为13±4%和21±3%。当地废水排放对下游水源水贡献了30±8%的NDMA和17±2%的NDMA FP。内源氨基酸代谢可为下游水源水贡献最多36%的NDMA FP。总之，本研究为定量评价不同污染源亚硝胺对城市供水的贡献提供了一个方案。
The source and fate ofN-nitrosamines and their precursors in terms of formation potential (FP) was investigated quantitatively in the city level for the first time. Different sources of nitrosamines and their precursors were investigated in one city in the Yangtze River delta, China. The source water located downstream of the city contained 8.4 ng/L ofN-nitrosodimethyamine (NDMA) and 153 ng/L of NDMA FP. The contribution of each discharge source was evaluated based on the concentration, the river water flux, and the amount of wastewater discharges. Textile printing and dyeing wastewater, and electroplating industrial wastewater contained high concentration of nitrosamines and were important discharge sources. Taking NDMA and NDMA FP attenuation by photolysis and biodegradation into consideration, the mass load calculation showed upstream surface water brought about 13 ± 4% of NDMA and 21 ± 3% of NDMA FP to downstream source water. Local wastewater discharges contributed 30 ± 8% of NDMA and 17 ± 2% of NDMA FP to downstream source water. Endogenous formation via amino acids metabolism could contribute 36% of NDMA FP (maximum) to downstream source water. Overall, this study provides a protocol for quantitative evaluation of the nitrosamine contribution to urban water supply from different contamination sources.