期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 532, 期 -, 页码 723-732出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2015.06.074
关键词
Build-up dynamics; Chemical fractionation; Heavy metal; Road-deposited sediment; Stormwater management
资金
- China Scholarship Council (CSC) [2010605020, 2010605021]
- Completion Grant (PSP-Element) by the Graduate Academy of the Technische Universitat Dresden by means of the Excellence Initiative by the German Federal Government [F-003661-553-52A-2330000]
- Completion Grant (PSP-Element) by the Graduate Academy of the Technische Universitat Dresden by means of the Excellence Initiative by the German State Government [F-003661-553-52A-2330000]
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. (c) 2015 Elsevier B.V. All rights reserved.
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