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Virlei Álvaro de Oliveira ; Pedro Marques da Silveira ; Glenio Guimarães Santos ;Revista Brasileira de Ciência do Solo 2011, 35 5

Autor: Cristiane Rodrigues

Fuente: http://www.redalyc.org/


Introducción



Revista Brasileira de Ciência do Solo ISSN: 0100-0683 revista@sbcs.org.br Sociedade Brasileira de Ciência do Solo Brasil Rodrigues, Cristiane; de Oliveira, Virlei Álvaro; Marques da Silveira, Pedro; Guimarães Santos, Glenio CHEMICAL DISPERSANTS AND PRE-TREATMENTS TO DETERMINE CLAY IN SOILS WITH DIFFERENT MINERALOGY Revista Brasileira de Ciência do Solo, vol.
35, núm.
5, 2011, pp.
1589-1596 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=180221126013 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative CHEMICAL DISPERSANTS AND PRE-TREATMENTS TO DETERMINE CLAY IN SOILS. 1589 CHEMICAL DISPERSANTS AND PRE-TREATMENTS TO DETERMINE CLAY IN SOILS WITH DIFFERENT MINERALOGY (1) Cristiane Rodrigues(2), Virlei Álvaro de Oliveira(3), Pedro Marques da Silveira(4) & Glenio Guimarães Santos (5) ABSTRACT Knowledge of the soil physical properties, including the clay content, is of utmost importance for agriculture.
The behavior of apparently similar soils can differ in intrinsic characteristics determined by different formation processes and nature of the parent material.
The purpose of this study was to assess the efficacy of separate or combined pre-treatments, dispersion methods and chemical dispersant agents to determine clay in some soil classes, selected according to their mineralogy.
Two Brazilian Oxisols, two Alfisols and one Mollisol with contrasting mineralogy were selected.
Different treatments were applied: chemical substances as dispersants (lithium hydroxide, sodium hydroxide, and hexametaphosphate); pre-treatment with dithionite, ammonium oxalate, and hydrogen peroxide to eliminate organic matter; and coarse sand as abrasive and ultrasound, to test their mechanica...





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