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Characterizing iron oxides from coastal and central plain soils.

De acordo com os resultados obtidos, concluiu-se que: There Radio atomico e ionico yahoo dating been several papers in the literature studying the genesis and consequences of particles cohesion in Argisols Ultisols and Latosols Oxisols from the Brazilian Inner and Coastal Plains.

Just a few, however, provide insights into the clay fraction mineralogy, specially, Radio atomico e ionico yahoo dating iron oxides complete characterization. The objective of this study was to investigate the chemical and crystallographic characteristics of iron oxides in red and yellow soils derived from the sediments of the Barreiras Formation or Pre-Cambrian rocks in the region of the coastal and central plateaus of several Brazilian states.

The following research procedures were used: X-ray diffraction analyses in iron oxide-concentrated samples; successive extractions with CBD, and ammonium oxalate extraction in clay samples; spectral characterization by DRS; estimation of the crystallographic properties of goethite; quantification of isomorphic substitution of Fe for Al; and electronic transmission microscopy.

According to the results, the following conclusions were drawn: These values did not agree with those estimated by mathematical models proposed in the scientific literature, which indicates the need for further studies of the relationships between crystallographic parameters of natural goethites and their chemical properties; c the results obtained by X ray diffractometry and chemical dissolution analysis revealed that the goethites in the soils differ from those cited, to date, in the literature; d the position of the bands obtained in the spectra of the diffuse reflectance spectroscopy was correlated with some crystallographic properties of the goethites in the soils, indicating a promising technique for the study of iron oxides.

Brazil, goethite, hematite, isomorphous substitution, Barreiras Formation. Para os demais, coletou-se apenas o horizonte Bt 2 Quadro 1.

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Foram utilizados os modelos propostos por Henke et al. Dessa forma, as goethitas dos solos dos Tabuleiros Costeiros e Interioranos parecem ter sido formadas em um ambiente peculiar. De acordo com Torrent et al. Resultados semelhantes foram obtidos por MoreauMelo et al. Os valores de Al DCB variaram de acordo com a classe de solo. Para a maioria das amostras, o DMC a determinado de acordo com Henke et al.

Os resultados obtidos de acordo com Henke et al.

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Resultados semelhantes foram descritos por Scheinost et al. Use of the Kubelka-Munk theory to study the influence of iron on soil colour. Choice of collimators for a crystal spectrometer for neutron diffraction.

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Structure, properties, reactions, occurence and uses. West Lafayette, Purdue University, Synthesis and properties of poorly crystalline hydrated aluminous goethites.

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Properties and quantitative estimation of poorly crystalline components in sesquioxidic soil clays. Iron oxide mineralogy in some brazilian Oxisols.

Raleigh, North Carolina State University, Iron oxides in selected brazilian Oxisols: High-efficiency low-energy x-ray spectroscopy in the eV region. A computer program for Rietveld analysis of x-ray an neutron power diffraction patterns. The 5 M NaOH concentrations treatment for iron oxides in soils.

The determination of crystallite-size and lattice-strain parameters in conjunction with the profile-refinament "Radio atomico e ionico yahoo dating" for determination of crystal structures. Characterization of iron oxides minerals by second-derivate visible spectroscopy.

Structure of Mn and Fe oxides and oxyhydroxides. Iron oxides removal from soils and clays by a dithionite-citrate-bicarbonate system buffered with bicarbonate sodium.

Mineralogy, chemistry, morphology and geomorphology of some soils of Central Plateau of Brazil. A profile refinament method for nuclear and magnetic structures. Use and limitations of second-derivative diffuse reflectance spectroscopy in the visible to near-infrared range to identify and quantify Fe oxides in soils.

Diffuse reflectance spectra of Al substituted goethite: A ligand field approach. The Influence of aluminum on iron oxides. Unit-cell dimensions of Al-substituted goethites and estimation of Al from them. Ocorrence and formation of iron oxides in various pedoenvironments.

Iron in soils and clays minerals.

Use of oxalate for Fe extraction from soil. Aluminum influence on iron oxides: Unit-cell parameters and aluminum substitution of natural goethites. Minerals in soil environments. Madison, Soil Science Society of America, The influence of aluminun on iron oxides.

Preparation and properties of Al-substituted hematite. Rio de Janeiro, Estudo ambiental para os programas de fomanto florestal da Aracruz Celulose S.

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