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Removal of heavy metals from a contaminated soil using organic chelating acids

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Abstract

Changes in heavy metal speciation and uptake by maize in a soil before and after washing with chelating organic acids, citric acid, tartaric acid and ethylenediaminetetraacetic acid were assessed. A sandy loam was collected from the vicinity of the Benue industrial layout, Makurdi, Nigeria and spiked with a quinternary mixture of nickel, copper, zinc, cadmium and lead nitrates to achieve higher levels of contamination. Batch soil washing experiments performed on 1.0 g portions of the spiked soil using 0.05 M chelating agents at a solid:liquid ratio of 1:25 showed that washing efficiencies varied in the order: ethylenediaminetetraacetic acid> citric acid> tartaric acid with metal extraction yields typically following the sequence, copper> nickel> zinc> cadmium> lead. Sequential extractions proposed by the European Communities Bureau of Reference method used to assess the redistribution of heavy metal forms in the soil showed that apparent metal mobilities were reduced upon soil washing. Citric acid removed most of the metals hitherto associated with the exchangeable and reducible fractions; tartaric acid, the exchangeable metal pools; and ethylenediaminetetraacetic acid, the non-residual metal pools. Heavy metal assay of harvested biomass of maize grown on unwashed and washed soil samples indicated that metal transfer coefficients, decreased in the order of treatment: ethylenediaminetetraacetic acid <citric acid <tartaric acid <unwashed soil. Ethylenediaminetetraacetic acid and citric acid appeared to offer greater potentials as chelating agents to use in remediating the high permeability soil. Tartaric acid, however, is recommended in events of moderate contamination.

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Authors and Affiliations

  1. Department of Chemistry, Benue State University, Makurdi, Nigeria

    R. A. Wuana M.Sc. (Lecturer), F. E. Okieimen Ph.D. (Full Professor) & J. A. Imborvungu B.Sc.

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  1. R. A. Wuana M.Sc.
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  2. F. E. Okieimen Ph.D.
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  3. J. A. Imborvungu B.Sc.
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Correspondence to R. A. Wuana M.Sc..

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Wuana, R.A., Okieimen, F.E. & Imborvungu, J.A. Removal of heavy metals from a contaminated soil using organic chelating acids. Int. J. Environ. Sci. Technol. 7, 485–496 (2010). https://doi.org/10.1007/BF03326158

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  • DOI: https://doi.org/10.1007/BF03326158

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