Pedosphere 27(1): 106--111, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Chromium adsorption in different mineralogical fractions from subtropical soils
J. BAVARESCO1, J. R. FINK2, M. L. K. RODRIGUES3, C. GIANELLO1, V. BARRÓN4 and J. TORRENT4
1Department of Soils, Federal University of Rio Grande do Sul, 91540-000 Porto Alegre, Rio Grande do Sul (Brazil)
2Laboratory of Soils, Federal Institute of Paraná, 85555-000 Palmas, Paraná (Brazil)
3Department of Research and Laboratory, Environmental Protection Foundation of Rio Grande do Sul State, 90620-090 Porto Alegre, Rio Grande do Sul (Brazil)
4Department of Agronomy, University of Córdoba, C4 Building, Campus of Rabanales, 14071 Córdoba (Spain)
ABSTRACT
      Safe application of chromium (Cr)-containing organic industrial wastes to soil requires considering the ability of the soil to adsorb Cr. In this study, the maximum Cr adsorption capacity was assessed for the bulk samples and their clay and iron-free clay fractions of four subtropical soils differing in mineralogy. To this end, the samples were supplied with Cr(III) nitrate solutions at pH 4.5 or 5.5. The results of Cr(III) adsorption fitted to a Freundlich equation and the adsorption capacity was positively correlated with soil organic matter and iron oxide contents. The clay fractions adsorbed more Cr per unit mass than the bulk soils and the iron-free clay fractions. The Cr(III) adsorption capacity increased with increasing soil pH due to more charges on adsorbing surfaces. Our results suggest that the soils rich in organic matter and iron oxides and having a pH above 4.5 are suitable for application of Cr(III)-loaded industrial wastes.
Key Words:  adsorption capacity, environmental contamination, iron-free clay fractions, iron oxides, point of zero charge, specific surface area
Citation: Bavaresco, J., Fink, J. R., Rodrigues, L. K., Gianello, C., BarrÓn, V. and Torrent, J. 2017. Chromium adsorption in different mineralogical fractions from subtropical soils. Pedosphere. 27(1): 106-111.
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