Journal
ENVIRONMENTAL POLLUTION
Volume 176, Issue -, Pages 55-62Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.01.019
Keywords
Metal; Agricultural soil; Spatial distribution; Potential risk; Source identification
Categories
Funding
- National Basic Research Program of China [2009CB421603]
- National Natural Science Foundation of China [20837002, 21177112]
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Increasing metal pollution has drawn broad public attention in China due to severe environmental quality deterioration. However, so far, there has been no study to survey metal accumulation in Chinese farmland soil at the national scale. In this study, we determined 11 metals in farmland soils across the Mainland China. Our results indicated the concentrations of Pb, Cd, Zn, and Cu (10.1-184.2, 0.082-1.31, 20.2-321.9, 8.2-515.9 mg/kg, respectively) were elevated above their reference values. Moreover, these metals followed a similar geochemical distribution pattern. The accumulation of Pb, Cd, Zn, and Cu in soils may be associated with human activities for soil fertility. Cadmium had the highest pollution index (PI) of 5.28, and the average hazard quotients (HQs) for all the metals were below 1. Hence, except for Cd, the metals in Chinese arable soils are comparatively safe. Results from this study may provide valuable information for agricultural soil management in China. (C) 2013 Elsevier Ltd. All rights reserved.
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