title: The build-up dynamic and chemical fractionation of Cu, Zn and Cd in road-deposited sediment.
abstract: This study investigates the build-up dynamics of heavy metals on impervious urban surfaces with different antecedent dry-weather periods (ADPs) and land-use types. Solid-phase concentration (mg/kg), surface load (mg/m(2)), and chemical fractionation of Zn, Cu and Cd in bulk- and size-fractionated road-deposited sediment were determined. The inherent correlations among particle size distribution, ADP, land use, and chemical fractionation were analysed by hierarchical cluster analysis. Results show a clear build-up phenomenon of Cu and Zn at a city commercial centre and a highway area. Cd had complex build-up patterns. With regard to chemical fractionation, Zn and Cd could pose higher risks than Cu to aquatic biota after a longer ADP. Special attention should be paid to the significant risk in a rural area because of the high proportion of exchangeable chemical fractionation in terms of the unstable Cd component. Hierarchical cluster analysis indicates that ADP had a strong influence on build-up processes of sediments and associated metals. The metal contents were very dependent on the particle size distribution. However, the chemical fractionation of metals was dependent to a lesser extent on the land-use type.
authors.affiliation: Institute of Urban Water Management, Technische Universität Dresden, 01062 Dresden, Germany. Electronic address: jin.zhang@hotmail.com.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Chair of Water Supply Engineering, Institute of Urban Water Management, Technische Universität Dresden, 01062 Dresden, Germany. Electronic address: pei.hua@hotmail.com.
authors.forename: Pei
authors.initials: P
authors.lastname: Hua
authors.affiliation: Institute of Urban Water Management, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Krebs
mesh_terms: D002104:Cadmium / Q000032:analysis; D003300:Copper / Q000032:analysis; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis*; D012989:Soil Pollutants; D014186:Transportation; D015032:Zinc / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants; D002104:Cadmium; D003300:Copper; D015032:Zinc
keywords: Build-up dynamics; Chemical fractionation; Heavy metal; Road-deposited sediment; Stormwater management