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| Migration characteristics and potential hazards of heavy metals from bauxite residue to soil under simulated acid rain |
| Received:July 25, 2016 |
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| KeyWord:bauxite residue;acid rain leaching;soil column;heavy metal migration;speciation |
| Author Name | Affiliation | E-mail | | LIU Ji-dong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China | | | REN Jie | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Beijing Normal University, College of Water Science, Beijing 100875, China | | | CHEN Juan | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LIU Xiao-lian | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China | | | XU Gang | College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China | | | WU Ming-hong | College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China | | | DU Ping | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | duping@craes.org.cn |
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| Abstract: |
| To understand the influence of heavy metals from combined bauxite residue on soil and groundwater, the migration characteristics of which were investigated using soil column experiments. Results showed that dissolved As, Cr, Cd, V, Mo accumulated mainly in the surface layer(0~20 cm) soil with the average concentration 17.71, 42.31, 0.79, 57.77, 29.76 mg·kg-1, respectively after leaching with acid rain(compared with the original concentration, increased by 5.83, 1.36, 2.21, 2.34, 1.89 times, respectively). Pb and Zn accumulated significantly in the 0~60 cm depth soil with the average concentration 18.67 mg·kg-1 and 58.52 mg·kg-1(8.76 times and 3.86 times, respectively). And Cu, Ni accumulated insignificantly in soil. Considering the heavy metal chemical speciation, As, Ni indicated greater migration risk for the highly acidic soluble fraction in soil. Cu, Cr, Mo in soil were mainly associated with oxidizable fraction and reducible fraction, and Pb, Zn, V were mainly reducible fraction, indicating higher potential mobility. Mo, V, Pb, Cu only detected in lower concentrations in the leachate, which ellucidating that the dissolved heavy metals mainly retained in soil. |
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