Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/909025
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dc.contributor.authorRODRIGUES, C.pt_BR
dc.contributor.authorOLIVEIRA, V. A. dept_BR
dc.contributor.authorSILVEIRA, P. M. dapt_BR
dc.contributor.authorSANTOS, G. G.pt_BR
dc.date.accessioned2011-12-08T11:11:11Zpt_BR
dc.date.accessioned2011-12-08T11:11:11Zpt_BR
dc.date.available2011-12-08T11:11:11Zpt_BR
dc.date.available2011-12-08T11:11:11Zpt_BR
dc.date.created2011-12-08pt_BR
dc.date.issued2011pt_BR
dc.identifier.citationRevista Brasileira de Ciência do Solo, Viçosa, MG, v. 35, n. 5, p. 1589-1596, set./out. 2011.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/909025pt_BR
dc.descriptionKnowledge 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 mechanical action. The conclusion was drawn that different treatments must be applied to determine clay, in view of the soil mineralogy. Lithium hydroxide was not efficient to disperse low-CEC electropositive soils and very efficient in dispersing high-CEC electronegative soils. The use of coarse sand as an abrasive increased the clay content of all soils and in all treatments in which dispersion occurred, with or without the use of chemical dispersants. The efficiency of coarse sand is not the same for all soil classes.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectAgentes químicospt_BR
dc.subjectPartículas do solopt_BR
dc.titleChemical dispersants and pre-treatments to determine clay in soils with different mineralogy.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2012-03-30T11:11:11Zpt_BR
dc.subject.thesagroPerfil do solopt_BR
dc.subject.thesagroClassificação do solopt_BR
dc.subject.thesagroArgilapt_BR
riaa.ainfo.id909025pt_BR
riaa.ainfo.lastupdate2012-03-30pt_BR
dc.contributor.institutionCRISTIANE RODRIGUES, Solocria Laboratório Agropecuária, Goiânia-GO; VIRLEI ÁLVARO DE OLIVEIRA, IBGE; PEDRO MARQUES DA SILVEIRA, CNPAF; GLENIO GUIMARÃES SANTOS, UNIVERSIDADE FEDERAL DO PIAUÍ.pt_BR
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