title: Preliminary Assessment of Health Risks of Potentially Toxic Elements in Settled Dust over Beijing Urban Area.
abstract: To examine levels, health risks, sources, and spatial distributions of potentially toxic elements in settled dust over Beijing urban area, 62 samples were collected mostly from residential building outdoor surfaces, and their <63 μm fractions were measured for 12 potentially toxic elements. The results show that V, Cr, Mn, Co, Ni, and Ba in dust are from predominantly natural sources, whereas Cu, Zn, As, Cd, Sb, and Pb mostly originate from anthropogenic sources. Exposure to these elements in dust has significant non-cancer risks to children but insignificant to adults. Cancer risks of Cr, Co, Ni, As, and Cd via inhalation and dermal contact are below the threshold of 10(-6)-10(-4) but As via dust ingestion shows a tolerable risk. The non-cancer risks to children are contributed mainly (75%) by As, Pb, and Sb, and dominantly (92%) via dust ingestion, with relatively higher risks mainly occurring in the eastern and northeastern Beijing urban areas. Although Cd, Zn, and Cu in dust are heavily affected by anthropogenic sources, their health risks are insignificant. Source appointments suggest that coal burning emissions, the dominant source of As, are likely the largest contributors to the health risk, and traffic-related and industrial emissions are also important because they contribute most of the Pb and Sb in dust.
authors.affiliation: College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China. dejunwan@foxmail.com.
authors.forename: Dejun
authors.initials: D
authors.lastname: Wan
authors.affiliation: School of Environmental Science and Engineering, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China. chl_zhan@126.com.
authors.forename: Changlin
authors.initials: C
authors.lastname: Zhan
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China. yucb8688@163.com.
authors.forename: Guanglin
authors.initials: G
authors.lastname: Yang
authors.affiliation: College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China. xqliu@niglas.ac.cn.
authors.forename: Xingqi
authors.initials: X
authors.lastname: Liu
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China. yjs607@163.com.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Yang
mesh_terms: D000328:Adult; D000393:Air Pollutants / Q000032:analysis*; D001151:Arsenic / Q000032:analysis*; D000068476:Beijing; D002648:Child; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D006801:Humans; D007221:Industry; D019216:Metals, Heavy / Q000032:analysis*; D018570:Risk Assessment; D001335:Vehicle Emissions
chemical_list: D000393:Air Pollutants; D004391:Dust; D019216:Metals, Heavy; D001335:Vehicle Emissions; D001151:Arsenic
keywords: concentration; enrichment factor; health risk; heavy metal; pollution; source