Journal
ENVIRONMENTAL POLLUTION
Volume 208, Issue -, Pages 145-152Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.09.050
Keywords
Soil particle size distribution; Metal bioaccessibility; Urban soil; Orchard soil
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Funding
- USDA National Institute of Food and Agriculture [NYC-125445]
- South China Institute of Environmental Sciences (SCIES) [PM-zx021-201406-015]
- China Scholarship Council (CSC) [201408440003]
- National Institute of Environmental Health Sciences (NIEHS) [R21ES017921]
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [R21ES017921] Funding Source: NIH RePORTER
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Exposure of young children to toxic metals in urban environments is largely due to soil and dust ingestion. Soil particle size distribution and concentrations of toxic metals in different particle sizes are important risk factors in addition to bioaccessibility of these metals in the particles. Analysis of particle size distribution and metals concentrations for 13 soils, 12 sampled from urban gardens and 1 from orchard found that fine particles (<105 mu m) comprised from 22 to 66% by weight of the tested soils, with Ba, Cu, Pb and Zn generally at higher concentrations in the finer particles. However, metal bioaccessibility was generally lower in finer particles, a trend most pronounced for Ba and Pb. Gastric was higher than gastrointestinal bioaccessibility for all metals except Cu. The lower bioaccessibility of Pb in urban garden soils compared to orchard soil is attributable to the higher organic matter content of the garden soils. (C) 2015 Elsevier Ltd. All rights reserved.
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