Influences of land use and antecedent dry-weather period on pollution level and ecological risk of heavy metals in road-deposited sediment

Environmental Pollution
Jin ZhangPeter Krebs

Abstract

Road-deposited sediment and its adsorbed pollutants have been regarded as significant sources of urban diffuse pollution. In this study, the solid-phase concentrations (mg/g), surface load (mg/m(2)) and chemical fractionation of zinc (Zn), copper (Cu) and cadmium (Cd) were determined. Geo-accumulation (Igeo) and ecological risk (RI) indexes were employed for metal risk assessment. Results show that the highest solid-phase concentrations of Zn and Cu were usually found at an industrial area. However, Cd had the highest solid-phase concentrations at a rural area, followed by a commercial area. The surface loads of Zn and Cu decreased along the city centre to city border gradient. However, Cd was distributed irregularly. In terms of chemical fractionation, the predominant components of Zn and Cd were identified in the unstable exchangeable fractions, indicating high potential ecological risks to the aquatic environments. Cu posed a comparably low risk due to the high proportions of the stable components of residual and oxidisable fractions. According to a two-dimensional hierarchical cluster analysis, Zn and Cu surface loads were dominantly influenced by the antecedent dry-weather period; Cd contents were strongly land-use type de...Continue Reading

Citations

Oct 28, 2018·Environmental Science and Pollution Research International·Donghai YuanJianying Liu
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Jan 30, 2021·The Science of the Total Environment·Wenyu YangPeter Krebs
Mar 31, 2021·Environmental Science and Pollution Research International·Masoud Hatami-ManeshAhmad Mohtadi
Jul 11, 2021·Journal of Environmental Management·Xuan ChangYing-Xia Li

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