Dispersantes químicos na análise granulométrica de latossolos
Autor(a) principal: | |
---|---|
Data de Publicação: | 2008 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | LOCUS Repositório Institucional da UFV |
Texto Completo: | http://locus.ufv.br/handle/123456789/5421 |
Resumo: | The most accurate textural analysis result is dependent on the soil sample s complete dispersal and maintenance of the dispersed phase s stability. The solution s high pH can be considered to be determinant in the dispersion of soils with pH dependent loads. Under the same pH and osmotic pressure conditions, the higher the ion s ionic hydrated radius, the more effective the clay dispersion will be, as a result of the increment of the diffuse double layer. Finally, the removal of cementing agents also increases soil sample dispersal. Thus, Na+ and Li+ compounds were tested as alternative dispersers against the solution NaOH 0.01 mol L-1, aiming to obtain a more effective dispersion so as to minimize the presence of pseudo-components, fundamentally pseudo-silt,in the granulometric analysis of Latosols. Samples of eight Latosols from the state of Minas Gerais were used, selected for presenting different materials of iron oxide origin and content. The treatments were arranged in a randomized block design, in an 8 x 2 x 7 factorial scheme, and three repetitions. The factors studied were the eight Latosol samples, removed from horizons A and B and seven dispersers. NaOH was used as a reference disperser, by additionally testing the solutions LiOH, NaClO, [NaClO + NaOH], [HCl + NaOH], (NaPO3)n and [(NaPO3)n + NaOH]. Mechanical dispersion was performed using a Wagner type rotatory agitator, regulated for 50 rotations during 16 hours. The alternative dispersers were compared with NaOH by means of the Dunnett test. Using the highest clay proportion to identify the dispersers effectiveness, none of them was equal to NaOH. Using the sign > to indicate greater effectiveness, the sequence determined was NaOH > [(NaPO3)n + NaOH] > [HCl + NaOH] > [NaClO + NaOH] > LiOH > (NaPO3)n > NaClO. Among the alternative dispersers, the [(NaPO3)n+NaOH] solution stood out, with results close to those of the reference disperser, showing the importance of increasing the pH up to values close to 12. The effectiveness of the other sodium solutions with high pH, [NaClO+NaOH] and [HCl+NaOH], was reduced by increasing the osmotic pressure of the solution, making soil sample dispersion difficult. LiOH was lower than the reference disperser. Such response is justified by the tendency of this alkaline cation to form covalent bonds that block negative electric loads of the clay exchange complex, leading to a decrease of the superficial load density. (NaPO3)n and NaClO were the least effective dispersers, due to the lower pH of their solutions. It can be concluded that the NaOH solution is the most effective in dispersing soil samples with clay presenting pH dependent cationic exchange capacity, favoring the increase of negative loads, repulsion between particles, and, consequently, soil sample dispersion with relatively low suspension osmotic pressure values. |
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Mauri, Jocimarhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4736674H7Ker, João Carloshttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763842Z5Fernandes, Raphael Bragança Alveshttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4728400J8Ruiz, Hugo Albertohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783550T5Rocha, Genelício Crusoéhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796777Y9Fontes, Luiz Eduardo Ferreirahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783256H7Donagemma, Guilherme Kangussúhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4761607E32015-03-26T13:53:08Z2009-09-082015-03-26T13:53:08Z2008-11-28MAURI, Jocimar. Dispersing chemicals in the granulometric analysis of latosols. 2008. 59 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2008.http://locus.ufv.br/handle/123456789/5421The most accurate textural analysis result is dependent on the soil sample s complete dispersal and maintenance of the dispersed phase s stability. The solution s high pH can be considered to be determinant in the dispersion of soils with pH dependent loads. Under the same pH and osmotic pressure conditions, the higher the ion s ionic hydrated radius, the more effective the clay dispersion will be, as a result of the increment of the diffuse double layer. Finally, the removal of cementing agents also increases soil sample dispersal. Thus, Na+ and Li+ compounds were tested as alternative dispersers against the solution NaOH 0.01 mol L-1, aiming to obtain a more effective dispersion so as to minimize the presence of pseudo-components, fundamentally pseudo-silt,in the granulometric analysis of Latosols. Samples of eight Latosols from the state of Minas Gerais were used, selected for presenting different materials of iron oxide origin and content. The treatments were arranged in a randomized block design, in an 8 x 2 x 7 factorial scheme, and three repetitions. The factors studied were the eight Latosol samples, removed from horizons A and B and seven dispersers. NaOH was used as a reference disperser, by additionally testing the solutions LiOH, NaClO, [NaClO + NaOH], [HCl + NaOH], (NaPO3)n and [(NaPO3)n + NaOH]. Mechanical dispersion was performed using a Wagner type rotatory agitator, regulated for 50 rotations during 16 hours. The alternative dispersers were compared with NaOH by means of the Dunnett test. Using the highest clay proportion to identify the dispersers effectiveness, none of them was equal to NaOH. Using the sign > to indicate greater effectiveness, the sequence determined was NaOH > [(NaPO3)n + NaOH] > [HCl + NaOH] > [NaClO + NaOH] > LiOH > (NaPO3)n > NaClO. Among the alternative dispersers, the [(NaPO3)n+NaOH] solution stood out, with results close to those of the reference disperser, showing the importance of increasing the pH up to values close to 12. The effectiveness of the other sodium solutions with high pH, [NaClO+NaOH] and [HCl+NaOH], was reduced by increasing the osmotic pressure of the solution, making soil sample dispersion difficult. LiOH was lower than the reference disperser. Such response is justified by the tendency of this alkaline cation to form covalent bonds that block negative electric loads of the clay exchange complex, leading to a decrease of the superficial load density. (NaPO3)n and NaClO were the least effective dispersers, due to the lower pH of their solutions. It can be concluded that the NaOH solution is the most effective in dispersing soil samples with clay presenting pH dependent cationic exchange capacity, favoring the increase of negative loads, repulsion between particles, and, consequently, soil sample dispersion with relatively low suspension osmotic pressure values.O resultado mais acurado da análise textural é dependente da completa dispersão da amostra de solo e da manutenção da estabilidade da fase dispersa. Pode considerar que o pH elevado da solução é determinante na dispersão de solos com cargas dependentes de pH. Nas mesmas condições de pH e pressão osmótica, quanto maior o raio iônico hidratado do íon, mais efetiva será a dispersão de argilas, por incrementar a dupla camada difusa. Por último, a remoção de agentes cimentantes também incrementa a dispersão da amostra de solo. Em decorrência dessas afirmativa, foram testados compostos de Na+ e Li+ como dispersantes químicos alternativos, frente à solução de NaOH 0,01 mol L-1, com objetivo de lograr dispersão mais efetiva de forma a minimizar a presença de pseudocomponentes, fundamentalmente pseudo-silte, na análise granulométrica de Latossolos. O trabalho foi realizado utilizando amostras de oito Latossolos do Estado de Minas Gerais, selecionados por apresentarem diferentes materiais de origem e teores de óxidos de ferro. Os tratamentos foram dispostos segundo um delineamento em blocos casualizados, correspondendo a um arranjo fatorial 8 x 2 x 7, com três repetições. Os fatores em estudo foram as amostras dos oito Latossolos, retiradas nos horizontes A e B e sete dispersantes. O NaOH foi utilizado como dispersante de referência, testando-se, adicionalmente soluções de LiOH, NaClO, [NaClO + NaOH], [HCl + NaOH], (NaPO3)n e [(NaPO3)n + NaOH]. A dispersão mecânica foi realizada utilizando-se agitador rotatório tipo Wagner, regulado para 50 rotações por minuto, durante 16 horas. Os dispersantes alternativos foram comparados com NaOH por meio de teste de Dunnett. Utilizando a maior proporção de argila para identificar a efetividade dos dispersantes, nenhum deles igualou-se ao NaOH. Utilizando o sinal > para indicar maior efetividade, a seqüência determinada foi: NaOH > [(NaPO3)n + NaOH] > [HCl + NaOH] > [NaClO + NaOH] > LiOH > (NaPO3)n > NaClO. Dentre os dispersantes alternativos, destacou-se a solução de [(NaPO3)n+NaOH], com resultados próximos aos do dispersante de referência, evidenciando a importância da elevação do pH até valores próximos de 12. A efetividade das outras soluções sódicas com pH elevado, [NaClO+NaOH] e [HCl+NaOH], foi reduzida pela elevação da pressão osmótica da solução, dificultando a dispersão da amostra de solo. O LiOH foi inferior ao dispersante de referência. Essa resposta é justificada pela tendência desse cátion alcalino, de formar ligações covalentes que bloqueiam cargas elétricas negativas do complexo de troca das argila, com diminuição da densidade de carga superficial. O (NaPO3)n e NaClO foram os dispersantes menos efetivos, pelo menor pH das suas soluções. Pode concluir-se que a solução de NaOH é a mais efetiva para dispersar amostras de solos com argilas que apresentam capacidade de troca catiônica dependente do pH, ao favorecer o incremento de cargas negativas, a repulsão entre partículas e consequentemente a dispersão da amostra de solo, com valores relativamente baixos da pressão osmótica da suspensão.application/pdfporUniversidade Federal de ViçosaMestrado em Solos e Nutrição de PlantasUFVBRFertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,Dispersantes químicosSolosAnálise granulométricaDispersing chemicalsSoilsGranulometric analysisCNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLODispersantes químicos na análise granulométrica de latossolosDispersing chemicals in the granulometric analysis of latosolsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFVORIGINALtexto completo.pdfapplication/pdf449987https://locus.ufv.br//bitstream/123456789/5421/1/texto%20completo.pdff46055cf3920c3d85666829b4db75facMD51TEXTtexto completo.pdf.txttexto completo.pdf.txtExtracted texttext/plain86434https://locus.ufv.br//bitstream/123456789/5421/2/texto%20completo.pdf.txt467d9b29e39309f1f137b8d0cab8e5b7MD52THUMBNAILtexto completo.pdf.jpgtexto completo.pdf.jpgIM Thumbnailimage/jpeg3561https://locus.ufv.br//bitstream/123456789/5421/3/texto%20completo.pdf.jpgef72683b8cacb441247a8a71e7419eacMD53123456789/54212016-04-11 23:02:13.94oai:locus.ufv.br:123456789/5421Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452016-04-12T02:02:13LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false |
dc.title.por.fl_str_mv |
Dispersantes químicos na análise granulométrica de latossolos |
dc.title.alternative.eng.fl_str_mv |
Dispersing chemicals in the granulometric analysis of latosols |
title |
Dispersantes químicos na análise granulométrica de latossolos |
spellingShingle |
Dispersantes químicos na análise granulométrica de latossolos Mauri, Jocimar Dispersantes químicos Solos Análise granulométrica Dispersing chemicals Soils Granulometric analysis CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
title_short |
Dispersantes químicos na análise granulométrica de latossolos |
title_full |
Dispersantes químicos na análise granulométrica de latossolos |
title_fullStr |
Dispersantes químicos na análise granulométrica de latossolos |
title_full_unstemmed |
Dispersantes químicos na análise granulométrica de latossolos |
title_sort |
Dispersantes químicos na análise granulométrica de latossolos |
author |
Mauri, Jocimar |
author_facet |
Mauri, Jocimar |
author_role |
author |
dc.contributor.authorLattes.por.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4736674H7 |
dc.contributor.author.fl_str_mv |
Mauri, Jocimar |
dc.contributor.advisor-co1.fl_str_mv |
Ker, João Carlos |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763842Z5 |
dc.contributor.advisor-co2.fl_str_mv |
Fernandes, Raphael Bragança Alves |
dc.contributor.advisor-co2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4728400J8 |
dc.contributor.advisor1.fl_str_mv |
Ruiz, Hugo Alberto |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783550T5 |
dc.contributor.referee1.fl_str_mv |
Rocha, Genelício Crusoé |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796777Y9 |
dc.contributor.referee2.fl_str_mv |
Fontes, Luiz Eduardo Ferreira |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783256H7 |
dc.contributor.referee3.fl_str_mv |
Donagemma, Guilherme Kangussú |
dc.contributor.referee3Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4761607E3 |
contributor_str_mv |
Ker, João Carlos Fernandes, Raphael Bragança Alves Ruiz, Hugo Alberto Rocha, Genelício Crusoé Fontes, Luiz Eduardo Ferreira Donagemma, Guilherme Kangussú |
dc.subject.por.fl_str_mv |
Dispersantes químicos Solos Análise granulométrica |
topic |
Dispersantes químicos Solos Análise granulométrica Dispersing chemicals Soils Granulometric analysis CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
dc.subject.eng.fl_str_mv |
Dispersing chemicals Soils Granulometric analysis |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO |
description |
The most accurate textural analysis result is dependent on the soil sample s complete dispersal and maintenance of the dispersed phase s stability. The solution s high pH can be considered to be determinant in the dispersion of soils with pH dependent loads. Under the same pH and osmotic pressure conditions, the higher the ion s ionic hydrated radius, the more effective the clay dispersion will be, as a result of the increment of the diffuse double layer. Finally, the removal of cementing agents also increases soil sample dispersal. Thus, Na+ and Li+ compounds were tested as alternative dispersers against the solution NaOH 0.01 mol L-1, aiming to obtain a more effective dispersion so as to minimize the presence of pseudo-components, fundamentally pseudo-silt,in the granulometric analysis of Latosols. Samples of eight Latosols from the state of Minas Gerais were used, selected for presenting different materials of iron oxide origin and content. The treatments were arranged in a randomized block design, in an 8 x 2 x 7 factorial scheme, and three repetitions. The factors studied were the eight Latosol samples, removed from horizons A and B and seven dispersers. NaOH was used as a reference disperser, by additionally testing the solutions LiOH, NaClO, [NaClO + NaOH], [HCl + NaOH], (NaPO3)n and [(NaPO3)n + NaOH]. Mechanical dispersion was performed using a Wagner type rotatory agitator, regulated for 50 rotations during 16 hours. The alternative dispersers were compared with NaOH by means of the Dunnett test. Using the highest clay proportion to identify the dispersers effectiveness, none of them was equal to NaOH. Using the sign > to indicate greater effectiveness, the sequence determined was NaOH > [(NaPO3)n + NaOH] > [HCl + NaOH] > [NaClO + NaOH] > LiOH > (NaPO3)n > NaClO. Among the alternative dispersers, the [(NaPO3)n+NaOH] solution stood out, with results close to those of the reference disperser, showing the importance of increasing the pH up to values close to 12. The effectiveness of the other sodium solutions with high pH, [NaClO+NaOH] and [HCl+NaOH], was reduced by increasing the osmotic pressure of the solution, making soil sample dispersion difficult. LiOH was lower than the reference disperser. Such response is justified by the tendency of this alkaline cation to form covalent bonds that block negative electric loads of the clay exchange complex, leading to a decrease of the superficial load density. (NaPO3)n and NaClO were the least effective dispersers, due to the lower pH of their solutions. It can be concluded that the NaOH solution is the most effective in dispersing soil samples with clay presenting pH dependent cationic exchange capacity, favoring the increase of negative loads, repulsion between particles, and, consequently, soil sample dispersion with relatively low suspension osmotic pressure values. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008-11-28 |
dc.date.available.fl_str_mv |
2009-09-08 2015-03-26T13:53:08Z |
dc.date.accessioned.fl_str_mv |
2015-03-26T13:53:08Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MAURI, Jocimar. Dispersing chemicals in the granulometric analysis of latosols. 2008. 59 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2008. |
dc.identifier.uri.fl_str_mv |
http://locus.ufv.br/handle/123456789/5421 |
identifier_str_mv |
MAURI, Jocimar. Dispersing chemicals in the granulometric analysis of latosols. 2008. 59 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2008. |
url |
http://locus.ufv.br/handle/123456789/5421 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
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application/pdf |
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Universidade Federal de Viçosa |
dc.publisher.program.fl_str_mv |
Mestrado em Solos e Nutrição de Plantas |
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UFV |
dc.publisher.country.fl_str_mv |
BR |
dc.publisher.department.fl_str_mv |
Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química, |
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Universidade Federal de Viçosa |
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LOCUS Repositório Institucional da UFV |
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