Du Xiaoli, Chi Zhongwen, Chen Mengyao, Yu Zhenya, Zhu Yingjie
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
Beijing Energy Conservation and Sustainable Urban and Rural Development Provincial and Ministry Co-Construction Collaboration Innovation Center, Beijing, 100044, China.
Environ Sci Pollut Res Int. 2022 Dec;29(60):90520-90529. doi: 10.1007/s11356-022-21791-w. Epub 2022 Jul 23.
The characteristics of dissolved organic matter (DOM) in road runoff under different traffic densities were compared using resin fractionation, molecular weight distribution analysis, three-dimensional excitation-emission matrix fluorescence spectroscopy, and UV-visible spectroscopy. Heavy traffic density strongly increased the concentration of DOM in road runoff, resulting in higher dissolved organic carbon. The distribution of molecular weights in DOM was not influenced by the traffic. DOM was dominated by colloidal organic matter with molecular weight in the 1 kDa to 0.45 μm size range. Hydrophobic fractions accounted for a large proportion than hydrophilic fractions in DOM, and hydrophobic acids increased with higher traffic density. Traffic density did not alter the fluorescent substances in DOM, including fulvic-like UV fluorescent substances and protein-like substances. However, more tryptophan-like protein substances were found in DOM from road runoff with heavy traffic. Moreover, the aromatization degree of DOM was not affected by heavy traffic, while the degree of humification decreased.
采用树脂分级、分子量分布分析、三维激发-发射矩阵荧光光谱和紫外-可见光谱等方法，比较了不同交通密度下道路径流中溶解有机物（DOM）的特征。高交通密度显著增加了道路径流中DOM的浓度，导致溶解有机碳含量更高。DOM的分子量分布不受交通影响。DOM以分子量在1 kDa至0.45μm范围内的胶体有机物为主。DOM中疏水组分所占比例大于亲水组分，且疏水酸随交通密度的增加而增加。交通密度并未改变DOM中的荧光物质，包括类富里酸紫外荧光物质和类蛋白质物质。然而，在高交通密度道路径流的DOM中发现了更多类色氨酸蛋白质物质。此外，DOM的芳构化程度不受高交通密度影响，而腐殖化程度降低。
