Extraction of copper and zinc from naturally contaminated copper mine soils: Chemical fractionation analysis and risk assessment

The leaching behaviour of Cu and Zn from contaminated soils at a copper mine was investigated using four extractants: citric acid (CA), oxalic acid (OA), ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA). Six soil samples were characterized for the distribution of four chemical...

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Bibliographic Details
Published in:Journal of Central South University 2018-06, Vol.25 (6), p.1274-1284
Main Authors: Xiao, Jiu-hua, Zhou, Jun, Wang, Zhao-hui, Li, Si-yue, Zhang, Wei-chao, Fang, Chang-ling, Guo, Yao-guang, Xiao, Dong-xue, Lou, Xiao-yi, Liu, Jian-she
Format: Article
Language:English
Subjects:
Acids
Chemical fractionation
Citric acid
Copper
Engineering
Ethylenediaminetetraacetic acids
Fractionation
Leaching
Metallic Materials
Nitrilotriacetic acid
Organic chemistry
Oxalic acid
Risk analysis
Risk assessment
Soil analysis
Soil chemistry
Soil contamination
Soil investigations
Speciation
Zinc
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Summary:The leaching behaviour of Cu and Zn from contaminated soils at a copper mine was investigated using four extractants: citric acid (CA), oxalic acid (OA), ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA). Six soil samples were characterized for the distribution of four chemical fractions of Cu or Zn (acid-soluble, reducible, oxidizable and residual). For the extraction of Cu, EDTA is more effective than other extractants when the concentration is less than 0.02 mol/L. The leaching efficiency for Cu was at least 15% higher for EDTA than for the other extractants at the same concentrations. Similar leaching behaviour was observed in the extraction of Zn. After extraction by CA, OA, EDTA or NTA, the acid-soluble fractions and the reducible fractions of Cu were the main fractions extracted. The potential environmental risks related to speciation were evaluated, and after extraction these risks were reduced.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-018-3824-6