Chen Meng-Yao, Du Xiao-Li, Yu Zhen-Ya, Zhu Ying-Jie, Liang Hui, Wu Fan
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Huan Jing Ke Xue. 2020 Apr 8;41(4):1709-1715. doi: 10.13227/j.hjkx.201908158.
The characteristics of DOM chemical fractions in road runoff with different traffic density were analyzed using excitation emission matrix spectroscopy (EEMs) technology, UV-vis spectra, and FTIR spectroscopy. The results showed that hydrophobic organics were the dominant components in DOM of road runoff, and hydrophobic neutral organics was the most abundant fraction. The hydrophilic organics in DOM of road runoff were mainly composed of protein-like substances. Both protein-like substances and fulvic-like acid substances were found in the hydrophobic organic matters. A high degree of aromatization and a low degree of humification were detected in hydrophobic organics, whereas the characteristics of hydrophilic organics were opposite. Some functional groups such as isomerized carboxyl and unsaturated C=C bonds were featured in acidic organics, and ether and ester groups, phenol, and alcohol were detected in alkaline and neutral organics. The substance composition and characteristics of DOM chemical fractions in road runoff were not affected by the traffic density. Traffic density influenced the quantity of substances in each chemical fraction only. With traffic density increasing, the matter content and the aromatization degree of DOM chemical fractions in road runoff increased, whereas the degree of humification decreased.
利用激发发射矩阵光谱（EEMs）技术、紫外可见光谱和傅里叶变换红外光谱（FTIR），分析了不同交通密度道路径流中溶解性有机物（DOM）化学组分的特征。结果表明，疏水有机物是道路径流DOM中的主要成分，疏水中性有机物是含量最丰富的组分。道路径流DOM中的亲水有机物主要由类蛋白物质组成。在疏水有机物中同时发现了类蛋白物质和类富里酸物质。疏水有机物具有高度的芳构化和低度的腐殖化，而亲水有机物的特征则相反。酸性有机物中具有一些官能团，如异构化羧基和不饱和C=C键，在碱性和中性有机物中检测到醚和酯基、酚和醇。道路径流中DOM化学组分的物质组成和特征不受交通密度的影响。交通密度仅影响各化学组分中物质的数量。随着交通密度的增加，道路径流中DOM化学组分的物质含量和芳构化程度增加，而腐殖化程度降低。
