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Characteristics of colloids and their affinity for heavy metals in road runoff with different traffic in Beijing, China

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Abstract

The characteristics of colloids in urban road runoff with different traffic in Beijing, China, such as concentration, particle size, chemical property, and affinity for heavy metals were determined. The concentration of colloids was high, and an evident first flush effect was found in the runoff of road with heavy traffic. A large portion of colloids were distributed in the range of 1–10 μm. Traffic activity, rainfall intensity, and time of sample collection would not change the size distribution of colloids in the road runoff. The chemical property of colloids in the road runoff would be influenced by the soil erosion nearby green space, causing the content of organic colloids was high. The correlation coefficient between the concentration of colloids in colloidal fractions and the concentration of heavy metals (Cu, Zn, Cd, Pb, Fe, and Mn) in the road runoff with different traffic decreased with the same sequence from 0.02–0.2 μm, 0.2–0.45 μm, 0.45–1 μm, to 1–10 μm, suggesting that the heavy metals had stronger affinity for the colloids with small size. The concentration of Cu, Pb, and Zn exhibited significant correlations with the concentration of organic colloids in the road runoff. More aggregated spherical particles were found in the TEM image of the road runoff with heavy traffic. Zeta potentials and RMV data showed that the colloids with smaller size and the colloids in the road runoff with lighter traffic were much more stable.

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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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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 Projects of the Beijing Municipal Education Commission (grant no. KM201810016008); the Pyramid Talent Training Project of Beijing University of Civil Engineering and Architecture (grant no. JDJQ20200302); and the Research Fund of Beijing University Civil Engineering and Architecture (grant no. KYJJ2017030).

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XLD: conceptualization; writing, review and editing; resources; visualization; supervision; project administration; funding acquisition. HL: formal analysis; investigation; data curation; writing, original draft. XF: methodology; validation; formal analysis; writing, review and editing. SSC: validation; investigation; data curation. JQL: conceptualization; writing, review and editing.

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Correspondence to Xiaoli Du.

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Responsible editor: Philippe Garrigues

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Du, X., Liang, H., Fang, X. et al. Characteristics of colloids and their affinity for heavy metals in road runoff with different traffic in Beijing, China. Environ Sci Pollut Res 28, 20082–20092 (2021). https://doi.org/10.1007/s11356-020-12020-3

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  • DOI: https://doi.org/10.1007/s11356-020-12020-3

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