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Chemical speciation of trace metals in atmospheric deposition and impacts on soil geochemistry and vegetable bioaccumulation near a large copper smelter in China
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  • Hailong Liu,
  • Jun Zhou,
  • Min Li,
  • Daniel Obrist,
  • Xiao-Zhi Wang,
  • Jing Zhou
Hailong Liu
College of Environmental Science and Engineering, Yangzhou University
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Jun Zhou
Institute of Soil Science, Chinese Academy of Sciences

Corresponding Author:[email protected]

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Min Li
College of Environmental Science and Engineering, Yangzhou University
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Daniel Obrist
Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts
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Xiao-Zhi Wang
College of Environmental Science and Engineering, Yangzhou University
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Jing Zhou
Institute of Soil Science, Chinese Academy of Sciences
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Abstract

Atmospheric deposition is an important source of trace metals to surface environments, but knowledge about plant bioavailability of recently deposited metals is limited. We performed a fully factorial soil and atmosphere exposure experiment with three vegetables (radish, lettuce, and soybean), which allowed to effectively distinguish impacts of recently deposited metals (<1 year) from longer-term metal exposures in soils. Results showed that recently deposited Cu, Cd, and Pb accounted for 0.5-15.2% of total soil Cu, Cd, and Pb pools near emission source, while they contributed 15-76% of Cu, Cd, and Pb concentrations in edible parts of vegetables. The soil retention of recently deposited metals (52-73%) presented as higher mobile fractions than these previously present in soils (7-42%). These findings highlight a preferential uptake and high rates of bioaccumulation of deposited metals in vegetables and implicated that quick and potentially stronger reduction can be achieved by reducing current atmospheric source loads.
Jul 2021Published in Journal of Hazardous Materials volume 413 on pages 125346. 10.1016/j.jhazmat.2021.125346