title: Chemical speciation and human health risk of trace metals in urban street dusts from a metropolitan city, Nanjing, SE China.
abstract: The modified BCR (the European Community Bureau of Reference) sequential extraction procedure was applied for partitioning and evaluating the mobility, availability and persistence of trace metals (Al, Cd, Co, Cr, Cu, Ni, Pb, Sr, V and Zn) in urban street dusts collected from different areas of Nanjing, China. The mobility sequence based on the sum of the BCR sequential extraction stages was: Sr (91.65%)>Pb (79.16%)>Zn (74.26%)>Cu (68.53%)>Co (45.98%)>Al (40.01%)≈V (38.45%)≈Ni (37.88%)>Cr (29.35%)>Cd (22.68%). Almost every trace metal had its highest total concentrations in the industrial area, except for Sr which had its highest concentration in the commercial area. Contamination factors (Cf), risk assessment code (RAC) and enrichment factor (Ef) were then calculated to further assess the environmental risk and provide a preliminary estimate of the main sources of trace metals in street dusts. Non-carcinogenic effects and carcinogenic effects due to exposure to urban street dusts were assessed for both children and adults. For non-carcinogenic effects, ingestion was the main route of exposure to street dusts for these metals, followed by dermal contact and inhalation. Hazard index values for all studied metals were lower than the safe level of 1, and Pb exhibited the highest risk value (0.125) in the case of children. The carcinogenic risk for Cd, Co, Cr and Ni were all below the acceptable level (<10(-6)).
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China.
authors.forename: Huiming
authors.initials: H
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Qian
authors.forename: Wei
authors.initials: W
authors.lastname: Hu
authors.forename: Yulei
authors.initials: Y
authors.lastname: Wang
authors.forename: Hailong
authors.initials: H
authors.lastname: Gao
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D062489:Health Impact Assessment; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis*; D008962:Models, Theoretical; D018570:Risk Assessment; D014131:Trace Elements / Q000032:analysis*; D014507:Urbanization
chemical_list: D000393:Air Pollutants; D004391:Dust; D019216:Metals, Heavy; D014131:Trace Elements