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Nickel, Lead and Zinc Sorption in a Reclaimed Settling Pond Soil

作者：

Verónica Asensio;Rubén Forján;F.A. Vega;Emma F. Covel

单位：

Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, As Lagoas-Marcosende, 36310 Vigo, Pontevedra (Spain);Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, As Lagoas-Marcosende, 36310 Vigo, Pontevedra (Spain; Department of Plant Nutrition, University of São Paulo-Center of Nuclear Energy in Agriculture (USP-CENA), 13400-970 Piracicaba-SP (Brazil)

关键词：

metals;wastes;ni;pb;residues;sewage sludge

摘要：

The wastes used to amend soils sometimes have high concentrations of metals such as nickel (Ni), lead (Pb) and zinc (Zn). To determine the capacity of soils to retain these metals, the sorption capacities of different mine soils with and without reclamation treatments (tree vegetation and waste amendment) for Ni, Pb and Zn in individual and competitive situations were evaluated using the batch sorption technique. The untreated settling pond soil had low capacity for Ni, Pb and Zn retention. The site amended with wastes (sewage sludges and paper mill residues) increased the sorption capacity most, probably because of the higher concentrations of soil components with high retention capacity such as carbon and clay fraction. No significant competition was observed between metals in the competitive sorption experiment, indicating that the maximum of sorption was not achieved by adding 0.5 mmol L-1 of metal. We can conclude that, despite the possible additions of Ni, Pb and Zn from wastes to degraded soils, sewage sludges and paper mill residues have a high sorption capacity that would prevent the metals from being in a mobile form.

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Nickel, Lead and Zinc Sorption in a Reclaimed Settling Pond Soil

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