133-3 Mineralogy and Arsenic Adsorption of Major Soil Classes in Minas Gerais State-Brazil.

Poster Number 1157

See more from this Division: S09 Soil Mineralogy
See more from this Session: Soil Mineral Weathering, Distribution and Analysis
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Mauricio Fontes1, Ceclia C. Almeida2, Breno N.F.S Ferreira2, Bruno T.L. Xavier2, Thiago T.C. Pereira2 and Eder S. Martins2, (1)Departamento de Solos, Universidade Federal de Viõosa, Viçosa, Brazil
(2)Departamento de Solos, Universidade Federal de Viµosa, Viçosa, Brazil
The objective of this work was to study a mineralogical characterization in the samples clays of soils in Minas Gerais State – Brazil, using chemical analysis (dithionite-citrate and ammonium oxalate), powder X-ray diffraction, and thermal analysis and determine the maximum adsorption for Arsenic. We performed X-ray diffraction of samples at the natural and after treatment with KCl 1.0 mol L-1 with heating at 550°C for 3 hours, and MgCl 1.0 mol L-1 with glycerol. Thermogravimetric Analysis (TGA) made in the range 25°C to 800°C (heating 10° C per minute). We found hematite, goethite, gibbsite, mica, magnetite, hydroxy-interlayered vermiculite (HIV), and predominance of kaolinite at all soils. In the Red-Yellow Argisols (Rhodic-Xanthic Ultisols) and Red-Yellow Latosols (Rhodic-Xanthic Oxisols), peaks kaolinite and goethite are present in all samples, and hematite in lower intensity. In Latosols, it was found characteristic peaks of maghemite/magnetite, and variable presence of gibbsite, with peaks at 0,48, 0,43 and 0,24 nm, more pronounced in soils weathered and acidic. The maximum adsorption of As for all soils was determined.
See more from this Division: S09 Soil Mineralogy
See more from this Session: Soil Mineral Weathering, Distribution and Analysis