Migration and transformation of heavy metals in street dusts with different particle sizes during urban runoff

The heavy metal pollution in runoff caused by street dust washoff has been an increasingly prominent problem in the context of rapid urbanization in China. Based on measurement of heavy metal contents in street dusts with different particle sizes and an experiment of street dust washoff using simula...

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Bibliographic Details
Published inHuanjing kexue Vol. 33; no. 3; p. 810
Main Authors He, Xiao-Yan, Zhao, Hong-Tao, Li, Xu-Yong, Lian, Bin, Wang, Xiao-Mei
Format Journal Article
LanguageChinese
Published China 01.03.2012
Subjects
China
Cities
Dust
Environmental Monitoring
Metals, Heavy - analysis
Particle Size
Rain
Vehicle Emissions - analysis
Water Movements
Water Pollutants, Chemical - analysis
China
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Summary:The heavy metal pollution in runoff caused by street dust washoff has been an increasingly prominent problem in the context of rapid urbanization in China. Based on measurement of heavy metal contents in street dusts with different particle sizes and an experiment of street dust washoff using simulated rainfall, we analyzed the role of particle size of street dust in heavy metal pollution, and the variation in geometrical forms of heavy metals during street dust washoff. Our results showed that the heavy metal concentration decreased from "static" street dust to "dynamic" runoff particulate in the same diameter particles. Heavy metals in street dust were dissolved and extracted during washoff. The average loss proportion of the five metals (Cr, Cu, Ni, Pb, Zn) were 24.3%, 56.8%, 34.3%, 22.8%, 27.3%, respectively. The loss proportion increased with the decrease of the particle size of street dust. Proportion of extracted form dust was higher in street than that in washoff samples, which suggested some dissolve
ISSN:0250-3301