Concentração de argilominerais 2:1 em solos subtropicais
Ano de defesa: | 2013 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
|
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Ciência do Solo
|
Departamento: |
Agronomia
|
País: |
BR
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/5566 |
Resumo: | The 2:1 expandable clay minerals have high importance when present in soil, even in small amount, as in the case of soil with a high degree of secondary alteration. The study of these minerals is essential to understanding the physical and chemical behavior of soils, however, the techniques have not always permitted their suitable concentration, in order to facilitate their study. Therefore, this study aimed to analyze the concentration of phyllosilicates clay minerals with 2:1 structure through the technique of selective dissolution of oxides and kaolinite, aiming their study by X-ray diffraction and thermal analysis. The samples were collected in Rio Grande do Sul, in different weather conditions in profiles of Regosols (RRd and RRe), Ferralsol (LVd) and Vertisol (VEo). The clay fraction of A and B horizons of soil were separated and subjected to treatment with dithionite-citrate-bicarbonate and then with warm NaOH in 10 different concentrations, from 0.5 to 5 mol L-1. For mineralogical characterization we used the techniques of X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The results obtained by the analysis of X-ray diffraction showed that for most weathered soils as the Ferrasol, the NaOH solution does not contribute to the concentration of the 2:1 mineral. However, to the Vertisol the solution of NaOH 4.0 mol L-1 was more efficient in the concentration of minerals. To the Regossol RRd no concentration of NaOH solution was effective and to the RRe the concentration of 2.5 mol L-1 solution of NaOH was most suitable for concentrating the 2:1 clay. The extraction of kaolinite and gibbsite by NaOH solution was only partial for kaolinite. The thermal analysis showed predominance of kaolinite and gibbsite in relation to the 2:1 minerals in the samples free of oxides. The most effective treatment for the thermal analysis for 2:1 mineral concentration was NaOH 4 mol L-1 for samples LVd B, RRh A, RRe A and Veo A. The NaOH 3 mol L-1 treatment was more efficient for samples LVd A and VEo B. The relative concentration of 2:1 was higher in samples with dystrophic character. |
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2017-04-112017-04-112013-02-22BERTOLAZI, Vanessa Thoma. 2:1 clay minerals concentration in subtropical soils. 2013. 34 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2013.http://repositorio.ufsm.br/handle/1/5566The 2:1 expandable clay minerals have high importance when present in soil, even in small amount, as in the case of soil with a high degree of secondary alteration. The study of these minerals is essential to understanding the physical and chemical behavior of soils, however, the techniques have not always permitted their suitable concentration, in order to facilitate their study. Therefore, this study aimed to analyze the concentration of phyllosilicates clay minerals with 2:1 structure through the technique of selective dissolution of oxides and kaolinite, aiming their study by X-ray diffraction and thermal analysis. The samples were collected in Rio Grande do Sul, in different weather conditions in profiles of Regosols (RRd and RRe), Ferralsol (LVd) and Vertisol (VEo). The clay fraction of A and B horizons of soil were separated and subjected to treatment with dithionite-citrate-bicarbonate and then with warm NaOH in 10 different concentrations, from 0.5 to 5 mol L-1. For mineralogical characterization we used the techniques of X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The results obtained by the analysis of X-ray diffraction showed that for most weathered soils as the Ferrasol, the NaOH solution does not contribute to the concentration of the 2:1 mineral. However, to the Vertisol the solution of NaOH 4.0 mol L-1 was more efficient in the concentration of minerals. To the Regossol RRd no concentration of NaOH solution was effective and to the RRe the concentration of 2.5 mol L-1 solution of NaOH was most suitable for concentrating the 2:1 clay. The extraction of kaolinite and gibbsite by NaOH solution was only partial for kaolinite. The thermal analysis showed predominance of kaolinite and gibbsite in relation to the 2:1 minerals in the samples free of oxides. The most effective treatment for the thermal analysis for 2:1 mineral concentration was NaOH 4 mol L-1 for samples LVd B, RRh A, RRe A and Veo A. The NaOH 3 mol L-1 treatment was more efficient for samples LVd A and VEo B. The relative concentration of 2:1 was higher in samples with dystrophic character.Os argilominerais 2:1 expansíveis apresentam elevada importância quando presentes nos solos, mesmo em quantidade pequena, como no caso de solos com elevado grau de alteração secundária. O estudo destes minerais é fundamental para o entendimento do comportamento físico-químico dos solos, no entanto, as técnicas utilizadas nem sempre tem permitido a sua concentração adequada, de forma a facilitar o seu estudo. Por isso, este trabalho teve como objetivo analisar a concentração de argilominerais filossilicatos com estrutura 2:1 através da técnica de dissolução seletiva de óxidos e caulinita, visando o seu estudo por difratometria de raios-X e por análise térmica. As amostras analisadas foram coletadas no Rio Grande do Sul, em diferentes condições climáticas, em perfis de Neossolos (RRd e RRe), Latossolo (LVd) e Vertissolo (VEo). A fração argila dos horizontes A e B destes solos foram separadas e submetidas ao tratamento com ditionito-citrato-bicarbonato de sódio e posteriormente com NaOH a quente em 10 concentrações diferentes, a partir de 0,5 até 5 mol L-1. Para a caracterização mineralógica utilizou-se as técnicas de difração de raios-X (DRX), termogravimetria (TG) e análise térmica diferencial (ATD). Os resultados obtidos pelas análises de difratometria de raios-X mostraram que para solos mais intemperizados como o Latossolo a solução de NaOH não contribui para a concentrar os minerais 2:1. No entanto, para o Vertissolo a solução de NaOH 4,0 mol L-1 foi mais eficiente na concentração desses minerais. Os Neossolos apresentaram comportamento distinto, sendo que para o RRd nenhuma concentração da solução de NaOH foi eficiente e para o RRe a concentração de 2,5 mol L-1 da solução de NaOH foi a mais adequada para a concentração dos argilominerais 2:1. A extração da caulinita e gibbsita através da solução de NaOH foi apenas parcial para a caulinita, observou-se a permanência deste mineral em boa parte das concentrações. As análises térmicas mostraram predominância de caulinita em relação à gibbsita e minerais 2:1 nas amostras desferrificadas. O tratamento mais eficiente, pela análise térmica, para concentração de minerais 2:1 foi o NaOH 4 mol L-1 para as amostras LVd B, RRh A, RRe A e VEo A e o tratamento NaOH 3 mol L-1 para as amostras LVd A e VEo B. A concentração relativa de 2:1 foi maior nas amostras com caráter distrófico.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Ciência do SoloUFSMBRAgronomiaDRXTGATDMineralogiaPedologiaXRDTGDTAMineralogyPedologyCNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLOConcentração de argilominerais 2:1 em solos subtropicais2:1 clay minerals concentration in subtropical soilsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPedron, Fabrício de Araújohttp://lattes.cnpq.br/6868334304493274Azevedo, Antonio Carlos dehttp://lattes.cnpq.br/4178002015710729Medeiros, Edgardo Ramoshttp://lattes.cnpq.br/7704373128199757http://lattes.cnpq.br/1968954401069963Bertolazi, Vanessa Thoma500100100005400300300300300f8f6a495-68e2-4652-9f6b-c78d1dab67f5f731e386-c1b3-4c45-b1ee-46bd73231ca4dcd20f52-039f-4810-aece-d989bf6f3ae380a55612-7a46-44c4-a173-c79d3abf9ee7info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALBERTOLAZI, VANESSA THOMA.pdfapplication/pdf715343http://repositorio.ufsm.br/bitstream/1/5566/1/BERTOLAZI%2c%20VANESSA%20THOMA.pdf79128b4c0625321824a420fecd36609aMD51TEXTBERTOLAZI, VANESSA THOMA.pdf.txtBERTOLAZI, VANESSA THOMA.pdf.txtExtracted texttext/plain49659http://repositorio.ufsm.br/bitstream/1/5566/2/BERTOLAZI%2c%20VANESSA%20THOMA.pdf.txt3a6b81b945a80559798dd4c602afdff3MD52THUMBNAILBERTOLAZI, VANESSA THOMA.pdf.jpgBERTOLAZI, VANESSA THOMA.pdf.jpgIM Thumbnailimage/jpeg4841http://repositorio.ufsm.br/bitstream/1/5566/3/BERTOLAZI%2c%20VANESSA%20THOMA.pdf.jpg42cb8306af2666d6c138a03565a87992MD531/55662023-05-15 16:40:09.276oai:repositorio.ufsm.br:1/5566Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2023-05-15T19:40:09Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Concentração de argilominerais 2:1 em solos subtropicais |
dc.title.alternative.eng.fl_str_mv |
2:1 clay minerals concentration in subtropical soils |
title |
Concentração de argilominerais 2:1 em solos subtropicais |
spellingShingle |
Concentração de argilominerais 2:1 em solos subtropicais Bertolazi, Vanessa Thoma DRX TG ATD Mineralogia Pedologia XRD TG DTA Mineralogy Pedology CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
title_short |
Concentração de argilominerais 2:1 em solos subtropicais |
title_full |
Concentração de argilominerais 2:1 em solos subtropicais |
title_fullStr |
Concentração de argilominerais 2:1 em solos subtropicais |
title_full_unstemmed |
Concentração de argilominerais 2:1 em solos subtropicais |
title_sort |
Concentração de argilominerais 2:1 em solos subtropicais |
author |
Bertolazi, Vanessa Thoma |
author_facet |
Bertolazi, Vanessa Thoma |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Pedron, Fabrício de Araújo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/6868334304493274 |
dc.contributor.referee1.fl_str_mv |
Azevedo, Antonio Carlos de |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/4178002015710729 |
dc.contributor.referee2.fl_str_mv |
Medeiros, Edgardo Ramos |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/7704373128199757 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/1968954401069963 |
dc.contributor.author.fl_str_mv |
Bertolazi, Vanessa Thoma |
contributor_str_mv |
Pedron, Fabrício de Araújo Azevedo, Antonio Carlos de Medeiros, Edgardo Ramos |
dc.subject.por.fl_str_mv |
DRX TG ATD Mineralogia Pedologia |
topic |
DRX TG ATD Mineralogia Pedologia XRD TG DTA Mineralogy Pedology CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
dc.subject.eng.fl_str_mv |
XRD TG DTA Mineralogy Pedology |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
description |
The 2:1 expandable clay minerals have high importance when present in soil, even in small amount, as in the case of soil with a high degree of secondary alteration. The study of these minerals is essential to understanding the physical and chemical behavior of soils, however, the techniques have not always permitted their suitable concentration, in order to facilitate their study. Therefore, this study aimed to analyze the concentration of phyllosilicates clay minerals with 2:1 structure through the technique of selective dissolution of oxides and kaolinite, aiming their study by X-ray diffraction and thermal analysis. The samples were collected in Rio Grande do Sul, in different weather conditions in profiles of Regosols (RRd and RRe), Ferralsol (LVd) and Vertisol (VEo). The clay fraction of A and B horizons of soil were separated and subjected to treatment with dithionite-citrate-bicarbonate and then with warm NaOH in 10 different concentrations, from 0.5 to 5 mol L-1. For mineralogical characterization we used the techniques of X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The results obtained by the analysis of X-ray diffraction showed that for most weathered soils as the Ferrasol, the NaOH solution does not contribute to the concentration of the 2:1 mineral. However, to the Vertisol the solution of NaOH 4.0 mol L-1 was more efficient in the concentration of minerals. To the Regossol RRd no concentration of NaOH solution was effective and to the RRe the concentration of 2.5 mol L-1 solution of NaOH was most suitable for concentrating the 2:1 clay. The extraction of kaolinite and gibbsite by NaOH solution was only partial for kaolinite. The thermal analysis showed predominance of kaolinite and gibbsite in relation to the 2:1 minerals in the samples free of oxides. The most effective treatment for the thermal analysis for 2:1 mineral concentration was NaOH 4 mol L-1 for samples LVd B, RRh A, RRe A and Veo A. The NaOH 3 mol L-1 treatment was more efficient for samples LVd A and VEo B. The relative concentration of 2:1 was higher in samples with dystrophic character. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-02-22 |
dc.date.accessioned.fl_str_mv |
2017-04-11 |
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2017-04-11 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
BERTOLAZI, Vanessa Thoma. 2:1 clay minerals concentration in subtropical soils. 2013. 34 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/5566 |
identifier_str_mv |
BERTOLAZI, Vanessa Thoma. 2:1 clay minerals concentration in subtropical soils. 2013. 34 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
url |
http://repositorio.ufsm.br/handle/1/5566 |
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UFSM |
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