Chemical Forms and Risk Assessment of Heavy Metals in Soils and Selected Hyper- tolerant Plants Around a Coal Mining Area in Western Guizhou Province
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    Abstract:

    [Objective] To investigate the heavy metal pollution and chemical forms and identify the hypertolerant plants in Western Guizhou Province in order to provide a scientific basis for preventing and controlling heavy metals pollution in the area.[Methods] The ecological risks of heavy metals in mining areas and non-mining areas were evaluated using potential ecological risk and fuzzy mathematic assessment models (the single factor deciding and the weighted average models). The physical and chemical indexes affecting soil fertility were tested. The chemical forms of heavy metals in soil samples were analyzed by risk assessment code. Bio-concentration factors were used to select plants with high tolerance to heavy metals around the coal mining area.[Results] The average concentrations of Hg, Cd, As, Zn, Cr and Ni in coal mining areas were 3.37, 1.11, 1.50, 1.63, 1.23 and 1.73 times higher than the background values. The potential ecological risk of studied heavy metals in coal mining area followed the order of:Cd > Hg > As > Ni > Cr > Pb > Zn. The single factor deciding model of the fuzzy mathematic assessment showed that the pollution of non-mining area was higher than that of mining area, but the weighted average model was opposite. The potential risk indexes of Cd, Cr, Cu, Mn, Ni, Pb and Zn in coal mining area were 69.17%, 7.97%, 8.24%, 40.10%, 45.29%, 53.70% and 29.90%, respectively. The As enrichment coefficient of Pteris vittata was greater than 1.00. The Cd enrichment coefficient of Pyracantha fortuneana, Broussonetia papyrifera, Rhus chinensis, Coriaria nepalensis, P. cretica and Hypericum patulum were greater than 1.00. The Pb enrichment coefficient of C. nepalensis and Artemisia stelleriana were greater than 1.00.[Conclusion] There existed more serious pollution in mining areas, especially Hg, Cd and As pollution. The potential risk of heavy metals in soils around the coal mining area is in the order of Cd > Pb > Ni > Mn > Zn > Cu > Cr. In conclusion, P. vittata can be used as the primary plant for remediation of As pollution surrounding the coal mining area. In addition, P. cretica could be used as the primary plant to repair the Cd pollution, and C. nepalensis could be used as the primary plant to repair the Pb pollution.

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吴先亮,黄先飞,全文选,胡继伟,秦樊鑫,唐凤华.黔西煤矿区周边土壤重金属形态特征、污染评价及富集植物筛选[J].水土保持通报英文版,2018,38(5):313-321

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History
  • Received:April 06,2018
  • Revised:May 13,2018
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  • Online: November 10,2018
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