期刊
ENVIRONMENTAL POLLUTION
卷 162, 期 -, 页码 389-398出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.11.040
关键词
Human health; Peri-urban agriculture; Risk assessment; Trace metals; Tropical leafy vegetables; Cadmium; Lead; Chromium; Nickel
资金
- Commonwealth Scholarship Commission
Concentrations of potentially toxic elements were measured in soils and five contrasting tropical leafy vegetables grown in a replicated field trial at five contaminated urban agriculture sites in Kampala City, Uganda. Soil contamination at each site could be tentatively ascribed to known waste disposal practices. There was considerable variation in metal uptake between vegetable types. Washing leafy vegetables reduced chromium and lead concentrations but exogenous contamination of leaves also depended on vegetable type, with Gynandropsis gynandra L showing a marked tendency to accumulate Pb and Cr. For the worst case scenario of children consuming unwashed vegetables, some metal 'hazard quotient' (HQ) limits (1.0) were violated at four of the five sites studied. For the 25 'site-vegetable' combinations assessed, the HQ for Pb exceeded 1.0 in 36% of cases. A vegetable-specific site screening tool based on soil extraction with 0.01 M CaCl2 and extrapolation to provide HQ values was assessed. (C) 2011 Elsevier Ltd. All rights reserved.
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