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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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| Registros recuperados : 188 | |
| 7. |  | VIANELLO, R. P.; RESENDE, R. T.; BRONDANI, C. Genômica. In: RESENDE, R. T.; BRONDANI, C. (ed.). Melhoramento de Precisão: aplicações e perspectivas na genética de plantas. Brasília, DF: Embrapa, 2023. Capítulo 10, p. 255-285. il.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 13. | | SILVEIRA, R. D. D.; VIANELLO, R. P.; LANNA, A. C.; BRONDANI, C.; CARNEIRO, N. P. Análise do transcriptoma de arroz (Oryza sativa) cultivado sob déficit hídrico. In: CONGRESSO BRASILEIRO DE MELHORAMENTO DE PLANTAS, 7., 2013, Uberlândia. Variedade melhorada: a força da nossa agricultura: anais. Viçosa, MG: SBMP, 2013. p. 104-107.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão; Embrapa Milho e Sorgo. |
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| 14. | | SILVA, D. R. A.; VIANELLO, R. P.; MENDONÇA, J. A.; CORDEIRO, A. C. C.; BRONDANI, C. Análise de QTL para produtividade baseada em linhas puras recombinantes de arroz. In: SEMINÁRIO JOVENS TALENTOS, 10., 2016, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2016. p. 81. (Embrapa Arroz e Feijão. Documentos, 311).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 15. | | ALVES, L. L.; MENDONCA, J. A.; VIANELLO, R. P.; ABREU, F. R. M.; BRONDANI, C. Avaliação da tolerância à seca de plantas T2 da cultivar de arroz BRSMG Curinga geneticamente modificadas. In: SEMINÁRIO JOVENS TALENTOS, 9., 2015, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2015. p. 78. (Embrapa Arroz e Feijão. Documentos, 309).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 16. | | BORBA, T. C. de O.; PEREIRA, H. S.; VIANELLO, R. P.; BASSINELLO, P. Z.; MATSUSHIGE, I. Identificação de regiões genômicas associadas a zinco e ferro em feijoeiro comum. In: REUNIÃO DE BIOFORTIFICAÇÃO NO BRASIL, 5., 2015, São Paulo. [Anais]... Brasília, DF: Embrapa; Rio de Janeiro: Embrapa Agroindústria de Alimentos, 2015. p. 180-181. Editora técnica: Marília Regini Nutti.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 20. | | PEREIRA, W. J.; BASSINELLO, P. Z.; BRONDANI, C.; VIANELLO, R. P. An improved method for RNA extraction from common bean seeds and validation of reference genes for qPCR. Crop Breeding and Applied Biotechnology, Viçosa, MG, v. 17, n. 2, p. 150-158, abr./jun. 2017.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 188 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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