| 亚热带土壤不同矿物组分中铬的吸附 |
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| 引用本文： | J. BAVARESCO,J. R. FINK,M. L. K. RODRIGUES,C. GIANELLO,V. BARR&#;N,J. TORRENT. 亚热带土壤不同矿物组分中铬的吸附[J]. 土壤圈, 2017, 27(1): 106-111. DOI: 10.1016/S1002-0160(17)60300-X |
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| 作者姓名： | J. BAVARESCO,J. R. FINK,M. L. K. RODRIGUES,C. GIANELLO,V. BARR&# N,J. TORRENT |
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| 摘 要： | 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.
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| 关 键 词： | adsorption capacity environmental contamination iron-free clay fractions iron oxides point of zero charge specific surface area |
Chromium adsorption in different mineralogical fractions from subtropical soils |
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| J. BAVARESCO,J. R. FINK,M. L. K. RODRIGUES,C. GIANELLO,V. BARR,#;N and J. TORRENT. Chromium adsorption in different mineralogical fractions from subtropical soils[J]. Pedosphere, 2017, 27(1): 106-111. DOI: 10.1016/S1002-0160(17)60300-X |
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| Authors: | J. BAVARESCO,J. R. FINK,M. L. K. RODRIGUES,C. GIANELLO,V. BARR&# N J. TORRENT |
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| Affiliation: | 1. Department of Soils, Federal University of Rio Grande do Sul, 91540-000 Porto Alegre, Rio Grande do Sul Brazil;2. Laboratory of Soils, Federal Institute of Paraná, 85555-000 Palmas, Paraná Brazil;3. Department of Research and Laboratory, Environmental Protection Foundation of Rio Grande do Sul State, 90620-090 Porto Alegre,Rio Grande do Sul Brazil;4. Department of Agronomy, University of Córdoba, C4 Building, Campus of Rabanales, 14071 Córdoba Spain |
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| 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. |
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| Keywords: | adsorption capacity environmental contamination iron-free clay fractions iron oxides point of zero charge specific surface area |
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