title: Characterization of heavy metal desorption from road-deposited sediment under acid rain scenarios.
abstract: Road-deposited sediments (RDS) on urban impervious surfaces are important carriers of heavy metals. Dissolved heavy metals that come from RDS influenced by acid rain, are more harmful to urban receiving water than particulate parts. RDS and its associated heavy metals were investigated at typical functional areas, including industrial, commercial and residential sites, in Guangdong, Southern China, which was an acid rain sensitive area. Total and dissolved heavy metals in five particle size fractions were analyzed using a shaking method under acid rain scenarios. Investigated heavy metals showed no difference in the proportion of dissolved fraction in the solution under different acid rain pHs above 3.0, regardless of land use. Dissolved loading of heavy metals related to organic carbon content were different in runoff from main traffic roads of three land use types. Coarse particles (>150μm) that could be efficiently removed by conventional street sweepers, accounted for 55.1%-47.1% of the total dissolved metal loading in runoff with pH3.0-5.6. The obtained findings provided a significant scientific basis to understand heavy metal release and influence of RDS grain-size distribution and land use in dissolved heavy metal pollution affected by acid rain.
authors.affiliation: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.affiliation: College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
authors.forename: An
authors.initials: A
authors.lastname: Liu
authors.affiliation: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Tsinghua University, Shenzhen 518500, Guangdong, China.
authors.forename: Guangxue
authors.initials: G
authors.lastname: Wu
authors.affiliation: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Tsinghua University, Shenzhen 518500, Guangdong, China.
authors.forename: Dunzhu
authors.initials: D
authors.lastname: Li
authors.affiliation: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Tsinghua University, Shenzhen 518500, Guangdong, China. Electronic address: guanyt@tsinghua.edu.cn.
authors.forename: Yuntao
authors.initials: Y
authors.lastname: Guan
mesh_terms: D015258:Acid Rain; D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry*; D008956:Models, Chemical; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D015258:Acid Rain; D019216:Metals, Heavy; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical
keywords: Acid rain; Heavy metal desorption; Particle size; Road-deposited sediment; Urban land use