Clay fraction mineralogy of a Cambisol in Brazil
| Autor: | F. S. Coelho, José Domingos Fabris, J. H. M. Viana, A. S. Anastacio, Joseph W. Stucki, I. V. Pinto |
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| Rok vydání: | 2006 |
| Předmět: |
Nuclear and High Energy Physics
Cambisol Goethite Chemistry Mineralogy Maghemite Weathering engineering.material Condensed Matter Physics Atomic and Molecular Physics and Optics visual_art Silicate minerals visual_art.visual_art_medium engineering Kaolinite Clay mineral X-ray diffraction Physical and Theoretical Chemistry Clay minerals |
| Zdroj: | Hyperfine Interactions. 166:619-624 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/s10751-006-9330-5 |
| Popis: | Clay minerals having a 2:1 (tetrahedral:octahedral sheet) structure may be found in strongly weathering soils only if the local pedo-climatic environment prevents them from further weathering to other minerals such as iron oxides. The clay minerals impart important chemical properties to soils, in part by virtue of changes in the redox state of iron in their crystal structures. Knowing the chemical nature of soil clays is a first step in evaluating their potential reactivity with other soil constituents and processes, such as the chemical decomposition of organic substrates to be potentially used in environmental remediation. The purpose of this work was to characterize the iron oxides and iron-bearing clay minerals from a B horizon of a Cambisol developed on tuffite in the State of Minas Gerais, Brazil, using chemical analysis, powder X-ray diffraction, Mossbauer spectroscopy, and thermal analysis. The iron oxides of this NaOH-treated clay-fraction were found to contain mainly maghemite (γFe2O3) and superparamagnetic goethite (αFeOOH). Kaolinite (Al2Si2O5(OH)4), smectite, and minor portions of anatase (TiO2) were identified in the CBD-treated sample. |
| Databáze: | OpenAIRE |
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