The concentrations, potential risk, and distributions of heavy metals in urban road runoff from different traffic density were determined and compared in Beijing, China. It showed that the concentrations of heavy metals in road runoff were strongly influenced by traffic density, resulting in total concentrations of Cu, Zn, Fe, Mn, and Pb in the runoff from highway higher than those from the road nearby campus. The potential ecological risk of heavy metals in the runoff from highway was higher than those from the road nearby campus. The distributions of heavy metals were not influenced by the traffic density. Cu, Zn, Cr, Cd, Pb, and Mn in road runoff transported predominantly in particulate-bound form and the dissolved form mainly distributed in colloidal fraction (1 kDa to 0.45 μm). Traffic density did not change the speciation of heavy metals in the road runoff, in which Cr and Zn mainly expressed in organic colloidal fraction while Fe, Mn, Cd, Pb, and Cu expressed in inorganic colloidal fraction. The traffic activities would contribute to the strong correlations between Fe, Zn, Mn, Cr, and Pb because of the similar sources.
Heavy metals Urban Road runoff Traffic density Colloidal fraction Risk assessment
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This work was supported by the National Natural Science Foundation of China (grant number 51878024), the Natural Science Foundation of Beijing Municipality (grant number 8162016), Science and Technology Projects of Beijing Municipal Education Commission (grant number KM201810016008), the Beijing Advanced Innovation Center of Urban Design for Future Cities: Sponge City Development and Water Quantity & Quality Risk Control (grant number UDC2016040100), and the Research Founds of Beijing University of Civil Engineering and Architecture (grant number KYJJ2017030).
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