Influence of alkaline extraction on the characteristics of humic substances in Brazilian soils

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorRosa, André Henrique
dc.creatorde Oliveira, L. C.
dc.creatorBellin, I. C.
dc.creatorRocha, Julio Cesar
dc.creatorRomao, LPC
dc.creatorDias, N. L.
dc.date2014-05-20T13:29:37Z
dc.date2016-10-25T16:48:56Z
dc.date2014-05-20T13:29:37Z
dc.date2016-10-25T16:48:56Z
dc.date2005-08-01
dc.date.accessioned2017-04-05T20:14:33Z
dc.date.available2017-04-05T20:14:33Z
dc.identifierThermochimica Acta. Amsterdam: Elsevier B.V., v. 433, n. 1-2, p. 77-82, 2005.
dc.identifier0040-6031
dc.identifierhttp://hdl.handle.net/11449/10026
dc.identifierhttp://acervodigital.unesp.br/handle/11449/10026
dc.identifier10.1016/j.tca.2005.02.001
dc.identifierWOS:000230580600010
dc.identifier0000-0002-2042-018X
dc.identifierhttp://dx.doi.org/10.1016/j.tca.2005.02.001
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/858018
dc.descriptionAn investigation was made of the influence of alkaline extraction on the characteristics of humic substances extracted from Brazilian soil samples. Humic substances (HS) from seven different soils samples collected in Brazil were extracted using the procedure recommended by the International Humic Substances Society (IHSS). Soils, HS and humins were characterized by thermogravimetry and differential thermal analysis. About 8 mg of each material (soil, HS and humin) were placed in a platinum crucible and heated continuously from 20 to 750 degrees C at a heating rate of 10 degrees C min(-1) in an atmosphere of synthetic air (100 ml min(-1)). A thermal analysis revealed a difference between the content and structural characteristics of organic matter present in HS and humin fractions in relation to their soils. The results indicated that alkaline extraction alters the characteristics of humic substances during the extraction process, underlining the importance of developing methodologies and analytical procedures that allow organic matter in soils to be studied without extracting it. (c) 2005 Elsevier B.V. All rights reserved.
dc.languageeng
dc.publisherElsevier B.V.
dc.relationThermochimica Acta
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjecthumic substances
dc.subjecthumin
dc.subjectBrazilian soils
dc.subjectextraction
dc.subjectthermogravimetry and differential thermal analysis
dc.titleInfluence of alkaline extraction on the characteristics of humic substances in Brazilian soils
dc.typeOtro


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