Characterization of dissolved organic matter as N-nitrosamine precursors based on hydrophobicity, molecular weight and fluorescence

查看全文 作　　者：Chengkun [1]Wang;Xiaojian [1]Zhang;Jun [1]Wang;Chao [1]Chen

机构地区：[1]School of Environment,Tsinghua University

出　　处：《Journal of Environmental Sciences》索引2013年第25卷第1期,共11页

基　　金：supported by the National Natural Science Foundation of China (No.51078208);the Major Science and Technology Program for Water Pollution Control and Treatment(No.2008ZX07420-005,2008X07423-002) 摘　　要：It is very important to identify the dominant precursors for N-nitrosamine formation from bulk organic matter, to enhance the understanding of N-nitrosamine formation pathways in water treatment plants and allow the development of practical treatment technologies. In this study, dissolved organic matter (DOM) from two source waters was fractionated with XAD resins and ultra- filtration membranes. The N-nitrosamine formation potential (FP) (ng of N-nitrosamines formed per mg of dissolved organic carbon (DOC)) from raw water and each fraction were measured and correlated with the fluorescence excitation-emission matrix (EEM), molecular weight (MW) and other assays. The results showed that the hydrophilic fraction had N-nitrosamine FP 1.3 to 3.5 times higher than the hydrophobic fraction from both source waters. The DOM fraction with low MW was the dominant fraction in these two source waters and contributed more precursors for N-nitrosamine formation than the larger MW fraction. The EEM spectra indicated there were notable amounts of soluble microbial products (SMPs) and aromatic proteins in the two studied rivers, which probably originated from wastewater discharge. The SMPs tended to be more closely correlated with N-nitrosodimethylamine formation potential than the other DOM components. Higher N-nitrosamine FP were also related to fractions with lower DOC/DON ratios and lower SUVA 254 values. 关键词：N-亚硝胺溶解有机碳有机物质大分子量荧光激发疏水性前体 N-亚硝基二甲胺

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Characterization of dissolved organic matter as N-nitrosamine precursors based on hydrophobicity, molecular weight and fluorescence

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