土壤重金属健康风险评价Identifying_Sources_and_Assessing_Potential_Risk_of_Heavy_Metals_in_Soils.pdfVIP

T ECHnICAl REPoRTS: HEAvy M ETA lS In THE Env IRonMEnT Identifying Sources and Assessing Potential Risk of Heavy Metals in Soils from Direct Exposure to Children in a Mine-Impacted City, Changsha, China Zhenxing Wang, Liyuan Chai,* Zhihui Yang, Yunyan Wang, and Haiying Wang Central South University xcessive accumulation of heavy metals (HMs) in soils may Heavy metal pollutants in soils can usually enter the human Epose serious health risks to humans and may exert adverse body and pose heath risks through a soil–crop–human body pathway (indirect exposure) or soil–human body pathway (direct impacts on the ecosystem itself (USEPA, 2009b). Under normal exposure). Previous studies often neglected the direct exposure circumstances, HM pollutants in soils can enter the human body in human health risk assessment, especially for children. We and pose heath risks through two pathways: (i) soil–crop–human collected surface soil samples from urban and suburb areas in body (indirect exposure) and (ii) soil–human body (direct expo- Changsha City, China, to analyze the content of As, Cd, Hg, Ni, sure). The first pathway—including HMs through vegetables, Pb, and Zn. A combination of principal component analysis, geostatistics, and triangulated irregular network (TIN) model rice (Oryza sativa L.), wheat ( Triticum aestivum L.), fruit, fish, was successfully used to discriminate the sources of heavy metals. and other foods—has been widely discussed (Ruby et al., 1999; The direct exposure method, sequential indicator simulation, Hough et al., 2004; Meharg, 2004; Zhu et al., 2008). Although and geographical information system (GIS) technologies