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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
20/10/2021 |
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Data da última atualização: |
20/10/2021 |
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Tipo da produção científica: |
Nota Técnica/Nota Científica |
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Autoria: |
NOVOTNY, E. H.; HAYES, M. H. B.; AZEVEDO, E. R. de; BONAGAMBA, T. J. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK; EDUARDO R. DE AZEVEDO, USP; TITO J. BONAGAMBA, USP. |
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Título: |
Characterisation of black carbon-rich samples by 13C solid-state nuclear magnetic resonance. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Naturwissenschaften, v. 93, p. 447-450, 2006. |
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DOI: |
https://doi.org/10.1007/s00114-006-0126-x |
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Idioma: |
Inglês |
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Notas: |
Short communication. |
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Conteúdo: |
There are difficulties in quantifying and characterising the organic matter (OM) in soils that contain significant amounts of partially oxidised char or charcoal materials. The anthropogenic black carbon (BC), such as that found in the Terra Preta de Índio soils of the Amazon region, is a good example of the OM that is difficult to analyse in such soils. 13C direct polarisation/magic angle spinning (DP/MAS) at high MAS frequency, 1H-13C cross polarisation (CP)/MAS with total suppression of spinning sidebands (TOSS), and chemical shift anisotropy (CSA) filter nuclear magnetic resonance techniques have been applied successfully for quantifying the different components of OM. However, because pyrogenic materials present strong local magnetic susceptibility heterogeneities, the use of CSA-filter and TOSS make the pulse sequences very sensitive to imperfections in the π pulses. In this study, the DP/MAS pulse sequence was replaced by a CP with a radio frequency ramp-variable amplitude CP (VACP)-VACP/MAS pulse sequence, and composite π pulses were used in the CSA-filter and TOSS pulse sequences. In that way, the component functionalities in a humic acid from a BC soil were successfully determined. The spectrometer time needed was greatly decreased by employing this VACP/MAS technique. This development provides an accurate method for characterising BC-rich samples from different origins. |
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Palavras-Chave: |
Black carbon; Chemical shift anisotropy; International Humic Substance Society; Magic angle spin. |
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Thesaurus Nal: |
Humic acids. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02184naa a2200241 a 4500
001 2135461
005 2021-10-20
008 2006 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s00114-006-0126-x$2DOI
100 1 $aNOVOTNY, E. H.
245 $aCharacterisation of black carbon-rich samples by 13C solid-state nuclear magnetic resonance.$h[electronic resource]
260 $c2006
500 $aShort communication.
520 $aThere are difficulties in quantifying and characterising the organic matter (OM) in soils that contain significant amounts of partially oxidised char or charcoal materials. The anthropogenic black carbon (BC), such as that found in the Terra Preta de Índio soils of the Amazon region, is a good example of the OM that is difficult to analyse in such soils. 13C direct polarisation/magic angle spinning (DP/MAS) at high MAS frequency, 1H-13C cross polarisation (CP)/MAS with total suppression of spinning sidebands (TOSS), and chemical shift anisotropy (CSA) filter nuclear magnetic resonance techniques have been applied successfully for quantifying the different components of OM. However, because pyrogenic materials present strong local magnetic susceptibility heterogeneities, the use of CSA-filter and TOSS make the pulse sequences very sensitive to imperfections in the π pulses. In this study, the DP/MAS pulse sequence was replaced by a CP with a radio frequency ramp-variable amplitude CP (VACP)-VACP/MAS pulse sequence, and composite π pulses were used in the CSA-filter and TOSS pulse sequences. In that way, the component functionalities in a humic acid from a BC soil were successfully determined. The spectrometer time needed was greatly decreased by employing this VACP/MAS technique. This development provides an accurate method for characterising BC-rich samples from different origins.
650 $aHumic acids
653 $aBlack carbon
653 $aChemical shift anisotropy
653 $aInternational Humic Substance Society
653 $aMagic angle spin
700 1 $aHAYES, M. H. B.
700 1 $aAZEVEDO, E. R. de
700 1 $aBONAGAMBA, T. J.
773 $tNaturwissenschaften$gv. 93, p. 447-450, 2006.
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| 5. |  | MARTIN-NETO, L.; BONAGAMBA, T. J.; COLNAGO, L. A.; PANEPUCCI, H. C.; VIEIRA, E.; MIYAZAWA, M. Avaliacao dos efeitos de diferentes manejos do solo sobre aspectos qualitativos das substancias humicas por RMN do estado solido. In: ENCONTRO DE USUARIOS DE RESSONANCIA MAGNETICA NUCLEAR, 5., maio 1995, Angra dos Reis, RJ. Resumos... Rio de Janeiro: AUREMN, 1995. p.62.| Biblioteca(s): Embrapa Instrumentação. |
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| 7. | | MORAES, T. B.; MONTRAZI, E. T.; COLNAGO, L. A.; BONAGAMBA, T. J.; MAGON, C. J. Análise exponencial através do método da diagonalização filtrada. In: JORNADA BRASILEIRA DE RESSONÂNCIA MAGNÉTICA, 13., 2014, Pirenópolis, GO. Mini-Cursos em RMN: Resumos. [Rio de Janeiro]: AUREMN, 2014. p. 23-24.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 8. | | SONG, G.; NOVOTNY, E. H.; HAYES, M. H. B.; AZEVEDO, E. R. de; BONAGAMBA, T. J. Char and humin fractions in Amazonian dark earths. 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. 311-314.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Solos. |
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| 11. | | SONG, G.; NOVOTNY, E. H.; AZEVEDO, E. R. de; BONAGAMBA, T. J. Composition of the humin fraction and coarse char of Terra Preta de Índios soils by NMR, multivariate curve resolution and scanning electron microscopy. In: ANNUAL INTERNATIONAL MEETING OF THE INTERNATIONAL BIOCHAR INITIATIVE, 2., 2008, Newcastle. Biochar, sustainability and security in a changing climate. Newcastle: International Biochar Initiative, 2008. p. 27-28. Ref. B21.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Solos. |
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| 12. | | GIOTTO, M. V.; BONAGAMBA, T. J.; PANEPUCCI, H. C.; VALENCIANO, G. R.; MATTOSO, L. H. C. RMN e análise térmica de complexos de polianilina com LiClO4. In: CONGRESSO BRASILEIRO DE POLÍMEROS, 4., set.-out. 1997, Salvador, BA. Anais... São Carlos: Associação Brasileira de Polímeros, 1997. p. 590-591.| Biblioteca(s): Embrapa Instrumentação. |
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| 13. | | GIOTTO, M. V.; BONAGAMBA, T. J.; PANEPUCCI, H.; VALENCIANO, G. R.; MATTOSO, L. H. C. RMN e análise térmica de complexos de polianilina com LiClO4. In: CONGRESSO BRASILEIRO DE POLÍMEROS, 4., set.-out. 1997, Salvador, BA. Anais... São Carlos: Associação Brasileira de Polímeros, 1997. 2 p. 1 CD-ROM.| Biblioteca(s): Embrapa Instrumentação. |
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| 16. | | NOVOTNY, E. H.; BONAGAMBA, T. J.; AZEVEDO, E. R. de; HAYES, M. H. B. Solid-state 13C nuclear magnetic resonance characterisation of humic acids extracted from amazonian dark earths (terra preta de índio). In: WOODS, W. I.; TEIXEIRA, W. G.; LEHMANN, J.; STEINER, C.; WINKLERPRINS, A.; REBELLATO, L. (ed.). Amazonian dark earths: Wim Sombroek's vision. Berlin: Springer, 2009. cap. 21, p. 373-391.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Solos. |
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| Registros recuperados : 65 | |
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