Aggregation and heavy metals distribution in urban storm water sediments
In urban contexts, storm waters must be managed. They leach, among other contaminants, heavy metals from roads and industrial buildings. Sometimes they are sent to infiltration ponds where heavy metals are deposited over the surface and concentrate gradually;in case of leaching, they could be a threat for the groundwater quality. Our research deals with the sediments deposited in an infiltration pond. The main aim of this research was to consider the link between sediment structure and potential leaching of metallic contaminants. By using laser diffraction grain size analysis, sediment aggregation was determined. The 160-1000 μm fraction is the only aggregated one. Zn, Pb, Cu, Cr, Ni and Cd were measured in all the different fractions. Heavy metal concentrations differed among grain size fractions: e. g. Zn concentrations ranged from 0. 25 mg · g<-1> in the> 1000 μm to 1.41 mg · g<-1> in the dispersible fraction. Cd was shown to be more mobile than the other metals. Such simple experiments can provide information to decision-makers about the way they must manage these highly contaminated sediments.
heavy metals particle size distributions sediments storm water
A. L. Badin C. Delolme J. P. Bedell
Laboratoire des Sciences de lEnvironnement, Ecole Nationale des Travaux Publics de lEtat, 69518 Vaulx en Velin cedex, France
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
582-583
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）