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Characteristics of dissolved organic matter in urban road runoff under different traffic densities in Beijing, China

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Abstract

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.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to express their gratitude to EditSprings (https://www.editsprings.cn/) for the expert linguistic services provided.

Funding

This work was supported by the National Natural Science Foundation of China (grant no. 51878024), the Beijing Outstanding Talent Project for Youth Talent Support Program, Science and Technology, and the Pyramid Talent Training Project of Beijing University of Civil Engineering and Architecture (grant no. JDJQ20200302).

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Conceptualization, writing—review and editing, supervision, project administration, and funding acquisition: Xiaoli Du; formal analysis, resources, writing—original draft, and data curation: Zhongwen Chi; writing—review and editing and validation: Mengyao Chen; investigation, methodology, and validation: Zhenya Yu, Yingjie Zhu.

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Correspondence to Xiaoli Du.

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Du, X., Chi, Z., Chen, M. et al. Characteristics of dissolved organic matter in urban road runoff under different traffic densities in Beijing, China. Environ Sci Pollut Res 29, 90520–90529 (2022). https://doi.org/10.1007/s11356-022-21791-w

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  • DOI: https://doi.org/10.1007/s11356-022-21791-w

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