[1]CHENG Junwei,CAI Shenwen,HUANG Mingqin.Analysis on Speciation and Risk Assessment of Heavy Metals in Soils and Surface Sediments of Maoshi Molybdenum mining Area in Guizhou[J].Research of Soil and Water Conservation,2021,28(01):353-359.
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Analysis on Speciation and Risk Assessment of Heavy Metals in Soils and Surface Sediments of Maoshi Molybdenum mining Area in Guizhou
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 01
Page number:
353-359
Column:
Public date:
2021-01-10
- Title:
- Analysis on Speciation and Risk Assessment of Heavy Metals in Soils and Surface Sediments of Maoshi Molybdenum mining Area in Guizhou
- Keywords:
- molybdenum mining area; heavy metal; distribution characteristic; speciation; pollution assessment
- CLC:
- X833
- DOI:
- -
- Abstract:
- The contents, speciation distributions and correlations of heavy metals in the soils and sediments of Maoshi molybdenum mining area in Guizhou were performed in present study to investigate the occurrence characteristic and ecological risk of heavy metals in molybdenum mining areas. The methods of single factor index and Nemerow index were used for evaluation and analysis of metal pollution. The results showed that the main accumulated pollution elements in the soils and sediments around the molybdenum mining area were Mo, Hg, and Cu. The average concentrations of Mo, Hg, and Cu in soils were 64.11 mg/kg, 1.14 mg/kg, and 412.76 mg/kg, and in sediments were 281.08 mg/kg, 19.55 mg/kg, and 693.83 mg/kg, respectively, which were far beyond the local background values. The accumulation levels of Pb, Cr, Mn, and Zn were relatively low and the Cd accumulated in several sediment samples. Mo was significantly positively correlated with Cd, and Zn in soils(p< 0.01), indicating that these metals might come from the same source of pollution. Mo and Hg in soils were mainly in form of residue and had low bioavailability. Mo mainly existed in oxidizable fraction in sediments and easily transformed and released under oxidizing and alkaline conditions. Cd and Mn were mainly in form of acid-soluble extraction. The Nemerow comprehensive indexes of soil and sediment were as high as 20.29 and 167.32, respectively, and both belonged to severe pollution level. The research area was characterized by significant enrichment of heavy metals and have shown a serious situation of comprehensive pollution and extremely high ecological risks.
- References:
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Last Update:
2021-01-15