期刊
ENVIRONMENTAL MONITORING AND ASSESSMENT
卷 186, 期 12, 页码 8727-8739出版社
SPRINGER
DOI: 10.1007/s10661-014-4040-y
关键词
Metal pollution; Agricultural land; Vegetable; Geochemical fractionation; Risk assessment
资金
- Leadership Program in Sustainable Living with Environmental Risk (SLER) at Yokohama National University from the Ministry of Education, Culture, Sports, Science and Technology
- Research Collaboration Promotion Fund provided by Graduate School of Environment and Information Sciences, Yokohama National University, Japan
The objective of this study was to assess the contamination level of trace metals in soil and vegetables and health risk to the urban population in Bangladesh. The range of Cr, Ni, Cu, As, Cd, and Pb in agricultural soils was 158-1160, 104-443, 157-519, 41-93, 3.9-13, and 84-574 mg/kg, respectively. Sequential extraction tests revealed that the studied metals were predominantly associated with the residual fraction, followed by the organically bound phase. Concerning Cu, Ni, Cd, and Pb in vegetables, more than 50 % samples exceeded the FAO/WHO recommended permissible limits. Considering the transfer of metals from soil to vegetables, Cu and Cd exhibited higher transfer factor (TF) values than the other metals. Target hazard quotient (THQ) for individual metal was below 1, suggesting that people would not experience significant health hazards if they ingest a single metal from vegetables. However, total metal THQ signifies the potential non-carcinogenic health hazard to the highly exposed consumers. The carcinogenic risk (TR) of As (1.9 x 10(-4)) and Pb (2.3 x 10(-5)) through consumption of vegetables were higher than the USEPA threshold level (10(-6)), indicating potential cancer risks.
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