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16. | | ORTOLAN, C.; AZEVEDO, E. W.; ANTIQUEIRA, A. C.; ORTOLAN, F. A. S.; BONISCH, H. Aproveitamento da biomassa residual de colheita florestal. In: SEMINÁRIO DE ATUALIZAÇÃO SOBRE SISTEMAS DE COLHEITA DE MADEIRA E TRANSPORTE FLORESTAL, 14.; ENCONTRO BRASILEIRO DE PRESTADORES DE SERVIÇOS DO SEGMENTO FLORESTAL, 2., Curitiba, 2006. Anais. Curitiba: UFPR: FUPEF, 2006. p. 133-144 Editores: J. R. Malinovski, C. M. C. Corrêa, T. B. Baggio e J. da S. Alves. Biblioteca(s): Embrapa Florestas. |
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20. | | CRUZ, P. T.; NACHTIGAL, J. C.; TORCHELSEN, M. de M.; AZEVEDO, E. C. de; WEBER, D. Cultura da goiabeira: alternativa para diversificação da matriz produtiva na metade Sul do Rio Grande do Sul. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS GRADUAÇÃO DA EMBRAPA CLIMA TEMPERADO, 3., 2010, Pelotas. resumos e palestras... Pelotas: Embrapa Clima Temperado, 2010. Anais: Carreira, ética e inovação: o que você está fazendo? Pelotas: Embrapa Clima Temperado, 2010. Editado por Ivan Rodrigues de Almeida, Leonardo Ferreira Dutra e Jamir Luis Silva da Silva. 1 CD-ROM. Biblioteca(s): Embrapa Clima Temperado. |
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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. |
Registro Completo
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
20/10/2021 |
Data da última atualização: |
20/10/2021 |
Tipo da produção científica: |
Nota Técnica/Nota Científica |
Autoria: |
NOVOTNY, E. H.; HAYES, M. H. B.; AZEVEDO, E. R. de; BONAGAMBA, T. J. |
Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK; EDUARDO R. DE AZEVEDO, USP; TITO J. BONAGAMBA, USP. |
Título: |
Characterisation of black carbon-rich samples by 13C solid-state nuclear magnetic resonance. |
Ano de publicação: |
2006 |
Fonte/Imprenta: |
Naturwissenschaften, v. 93, p. 447-450, 2006. |
DOI: |
https://doi.org/10.1007/s00114-006-0126-x |
Idioma: |
Inglês |
Notas: |
Short communication. |
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. |
Palavras-Chave: |
Black carbon; Chemical shift anisotropy; International Humic Substance Society; Magic angle spin. |
Thesaurus NAL: |
Humic acids. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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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