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

被引：0
作者：
Xiaoli Du
Hui Liang
Xing Fang
Shenshen Cui
Junqi Li
机构：
[1] Beijing University of Civil Engineering and Architecture,Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education
[2] Beijing University of Civil Engineering and Architecture,Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control
[3] Auburn University,Department of Civil Engineering
来源：
Environmental Science and Pollution Research | 2021年 / 28卷
关键词：
Road runoff; Colloids; Traffic density; Heavy metals; Migration; Stability;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：20082 / 20092
页数：10
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