Leaching characteristics of arsenic and heavy metals in urban roadside soils using a simple bioavailability extraction test.
Regular ingestion of soils could pose a potential health threat due to long-term toxic element exposure. In order to estimate the human bioavailability quotients for As and heavy metals, 12 urban roadside soil samples were collected and analyzed for As, Pb, Cu, Zn, Ni, Co, and Cr using Simple Bioavailability Extraction Test (SBET). The quantities of As, Pb, Cu, Zn, Ni, Co, and Cr leached from soils within the simulated human stomach for 1 h indicated, on average, 27.3, 71.7, 40.4, 59.3, 17.7, 27.2 and 5.6% bioavailability, respectively. Significant positive correlations were observed between the amounts leached using SBET and the total amounts dissolved with HNO(3)-HCl-HF acid mixtures. Stepwise multiple regression analysis indicated that the amounts leached with SBET for As, Pb, Zn, Ni, and Co were not related to any of the physic-chemical parameters measured (i.e., soil texture, pH, total organic matter). These results may be valuable for providing input data for risk assessment at sites subject to anthropogenic soil contamination.
Wang
Xue-song
XS
Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, People's Republic of China. snowpine1969@yahoo.com.cn
Qin
Yong
Y
Chen
Yong-kang
YK
D001151:Arsenic / Q000032:analysis*; D001682:Biological Availability; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D019216:Metals, Heavy / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014505:Urban Population
D019216:Metals, Heavy; D012989:Soil Pollutants; D001151:Arsenic