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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
12/01/2009 |
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Data da última atualização: |
06/04/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
NOVOTNY, E. H.; HAYES, M. H. B.; SONG, G.; AZEVEDO, E. R. de; BONAGAMBA, T. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL HILARY B. HAYES, UNIVERSITY OF LIMERICK; GUIXUE SONG, UNIVERSITY OF LIMERICK; EDUARDO RIBEIRO DE AZEVEDO, USP; TITO JOSÉ BONAGAMBA, USP. |
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Título: |
Extraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios"). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108. |
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Idioma: |
Inglês |
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Conteúdo: |
Humin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO. MenosHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons a... Mostrar Tudo |
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Palavras-Chave: |
black carbon; indios; NMR; pyrogenic carbon. |
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Thesaurus Nal: |
humin; terra preta. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/334758/1/Extraction-and-characterization-of-humin-fraction-2008.pdf
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Marc: |
LEADER 02605nam a2200229 a 4500
001 1334758
005 2022-04-06
008 2008 bl uuuu u00u1 u #d
100 1 $aNOVOTNY, E. H.
245 $aExtraction and characterisation of humin fraction from Amazonian anthropogenic dark earth soils ("Terra Preta de Indios").$h[electronic resource]
260 $aIn: INTERNATIONAL MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 14., 2008, Saint Petersburg. From molecular understanding to innovative applications of humic substances: proceedings... Moscow: Lomonosov Moscow State University, 2008. v. 1, p. 105-108.$c2008
520 $aHumin, the humic fraction that is insoluble in water at all pH values, typically comprises more than 50% of soil organic matter (1). Because of the difficulties in isolation, humin compositions and properties have been less extensively studied than those of humic and fulvic acids (2). On the basis of the accepted definition, humin can include any humic-type substances that are not dissolv ed during exhaustive extractions with aqueous base. A solvent system composed of a mixture of aqueous base/urea (0.1 M NaOH + 6 M urea, base/urea) has been reported to isolate material that would be classified as humin in the classical definition (3, 4, 5). Because urea is a powerful hydrogen bond breaker, it is considered that soil organic components were released from associations with humin materials either by the breaking of hydrogen bonds, or by the disruption of steric constraints by materials that had trapped the components released. Dimethylsulfoxide (DMSO), a dipolar aprotic solvent, is an excellent solvent for cations but a poor solvent for anions (6). It is a good hydrogen bond breaker and the non- polar backbone (as distinct from the S=O face) of DMSO can be considered to have affinities for less polar humin components. A solvent mixture of DMSO with HCl (6%, v/v) was reported to have isolated less than 22% of humin material from soils (7, 8, 9). However H 2SO4 is a very polar liquid with a high dielectric constant (~100), and due to the process of autoprotolysis (10), protons are highly mobile in H 2SO4. This enables it to protonate the conjugate bases (carboxylates and phenolates), thereby increasing the solubility of the organic material (4, 5), since anions are weakly solvated in DMSO.
650 $ahumin
650 $aterra preta
653 $ablack carbon
653 $aindios
653 $aNMR
653 $apyrogenic carbon
700 1 $aHAYES, M. H. B.
700 1 $aSONG, G.
700 1 $aAZEVEDO, E. R. de
700 1 $aBONAGAMBA, T.
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Registro original: |
Embrapa Solos (CNPS) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
03/03/2009 |
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Data da última atualização: |
03/03/2009 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
GAMA, M. A. S.; RIGUEIRA, J. C. S.; MENDONÇA, A. C.; BANDEIRA, C. M.; PAULA, B. M. D.; GLORIA, M. B. A.; RIBEIRO, M. T.; RIBEIRO, C. A. dos S.; PEIXOTO, M. G. C. D. |
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Afiliação: |
Marco Antonio Sundfeld da Gama, Embrapa Gado de Leite; Fernando César Ferraz Lopes, Embrapa Gado de Leite; Juliana Cristina Sampaio Rigueira; Adriana Correa Mendonça, Cecília Muller Bandeira; Bruno Martins Dala Paula; Maria Beatriz Abreu Glória, UFMG; Ma. |
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Título: |
Perfil de ácidos graxos e estabilidade oxidativa de manteigas oriundas de vacas recebendo dietas com óleo de soja. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE CIÊNCIA E TECNOLOGIA DE ALIMENTOS, 21., 2008. Anais... Belo Horizonte: SBCTA, 2008. |
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Páginas: |
3 p. |
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Idioma: |
Português |
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Notas: |
1 CD |
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Palavras-Chave: |
Ácidos graxos; Alimentação de bovinos; Estabilidade oxidativa de manteigas. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00873naa a2200265 a 4500
001 1596776
005 2009-03-03
008 2008 bl --- 0-- u #d
100 1 $aGAMA, M. A. S.
245 $aPerfil de ácidos graxos e estabilidade oxidativa de manteigas oriundas de vacas recebendo dietas com óleo de soja.
260 $c2008
300 $a3 p.
500 $a1 CD
653 $aÁcidos graxos
653 $aAlimentação de bovinos
653 $aEstabilidade oxidativa de manteigas
700 1 $aRIGUEIRA, J. C. S.
700 1 $aMENDONÇA, A. C.
700 1 $aBANDEIRA, C. M.
700 1 $aPAULA, B. M. D.
700 1 $aGLORIA, M. B. A.
700 1 $aRIBEIRO, M. T.
700 1 $aRIBEIRO, C. A. dos S.
700 1 $aPEIXOTO, M. G. C. D.
773 $tIn: CONGRESSO BRASILEIRO DE CIÊNCIA E TECNOLOGIA DE ALIMENTOS, 21., 2008. Anais... Belo Horizonte: SBCTA, 2008.
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