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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
28/03/2005 |
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Data da última atualização: |
28/03/2005 |
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Autoria: |
SAAB, S. C.; MARTIN-NETO, L. |
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Título: |
Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Química Nova, v. 26, n. 4. p. 497-498, 2003. |
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Idioma: |
Inglês |
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Conteúdo: |
In this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.
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Palavras-Chave: |
Estabilização; Matéria orgânica do solo; Radicais livres. |
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Categoria do assunto: |
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Marc: |
LEADER 01221naa a2200169 a 4500
001 1028885
005 2005-03-28
008 2003 bl --- 0-- u #d
100 1 $aSAAB, S. C.
245 $aUse of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions.
260 $c2003
520 $aIn this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.
653 $aEstabilização
653 $aMatéria orgânica do solo
653 $aRadicais livres
700 1 $aMARTIN-NETO, L.
773 $tQuímica Nova$gv. 26, n. 4. p. 497-498, 2003.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 3 | |
| 1. |  | OLIVEIRA, V. P. de; MARTINS, W. B. R.; RODRIGUES, J. I. de M.; SILVA, A. R.; LOPES, J. do C. A.; LIMA NETO, J. F. de; SCHWARTZ, G. Are liming and pit size determining for tree species establishment in degraded areas by kaolin mining? Ecological Engineering, v. 178, Article 106599, May 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 2. | | MARTINS, W. B. R.; RODRIGUES, J. I. de M.; OLIVEIRA, V. P. de; RIBEIRO, S. S.; BARROS, W. dos S.; SCHWARTZ, G. Mining in the Amazon: Importance, impacts, and challenges to restore degraded ecosystems. Are we on the right way? Ecological Engineering, v. 174, 106468, Jan. 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 3. | | BARBOSA, R. de S.; VALE, R. S. do; SCHWARTZ, G.; MARTINS, W. B. R.; RIBEIRO, S. S.; RODRIGUES, J. I. de M.; FERREIRA, G. C.; BARBOSA, V. M. Restoration of degraded areas after bauxite mining in the eastern Amazon: Which method to apply? Ecological Engineering, v. 180, 106639, July 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 3 | |
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