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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
25/11/2004 |
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Data da última atualização: |
08/03/2010 |
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Autoria: |
PÉREZ, M. G.; MARTIN-NETO, L.; SAAB, S. C.; NOVOTNY, E. H.; MILORI, D. M. B. P.; BAGNATO, V. S.; COLNAGO, L. A.; MELO, W. J.; KNICKER, H. |
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Título: |
Characterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 118, p. 181-190, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
The importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was higher, showing that organic matter (OM) formed in this cases is less aromatic. The tluorescence intensities were in agreement with the percentage of aromatic carbons, determined by NMR (r=0.97 PMenosThe importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was... Mostrar Tudo |
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Palavras-Chave: |
EPR; FTIR; NMR; Nuclear; Ressonância magnética. |
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Categoria do assunto: |
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Marc: |
LEADER 02550naa a2200277 a 4500
001 1028683
005 2010-03-08
008 2004 bl --- 0-- u #d
100 1 $aPÉREZ, M. G.
245 $aCharacterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy.
260 $c2004
520 $aThe importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventionaI tillage/maize-bare fallow (CTI); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NTI); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance r3C NMR), Fourier transform infra-red (FTIR) and uv- Vis tluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for alI treatments. The levei of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74 x 1017 and 1.02 x 1017 spins g- 1 HA, respectively), compared with 2.3 x 1017 spins g- 1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was higher, showing that organic matter (OM) formed in this cases is less aromatic. The tluorescence intensities were in agreement with the percentage of aromatic carbons, determined by NMR (r=0.97 P<O.OI) and with semiquinone content, determined by EPR (r=0.97 P<O.OI).
653 $aEPR
653 $aFTIR
653 $aNMR
653 $aNuclear
653 $aRessonância magnética
700 1 $aMARTIN-NETO, L.
700 1 $aSAAB, S. C.
700 1 $aNOVOTNY, E. H.
700 1 $aMILORI, D. M. B. P.
700 1 $aBAGNATO, V. S.
700 1 $aCOLNAGO, L. A.
700 1 $aMELO, W. J.
700 1 $aKNICKER, H.
773 $tGeoderma, Amsterdam$gv. 118, p. 181-190, 2004.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 10 | |
| 1. |  | BARRIQUELLO, M. F.; PÉREZ, M. G.; NEVES, E. F. A.; MARTIN-NETO, L. Estudo da estrutura de polímeros análogos às substâncias húmicas utilizando RMN de 13C em estado sólido. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, ENQA, 12. Química Analítica Moderna: uma contribuição para a química limpa., out. 2003., São Luís, MA. Resumos... São Luís, MA. 2003. [CD-ROM]. Ref. OT 017.| Biblioteca(s): Embrapa Instrumentação. |
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| 3. | | SILVA, A. C.; TORRADO, P. V.; MARTIN-NETO, L. VASQUEZ, F. M.; PÉREZ, M. G. Soil organic matter and geomorphic surface stability relationship in an oxisol toposequence (SE BRAZIL). In: INTERNATIONAL MEETING OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY. -- IHSS, 12, São Pedro, SP, 2004. Humic substances and soil and water environment. Abstracts...[São Carlos], SP: Embrapa Instrumentação Agropecuária, 2004. p. 80.| Biblioteca(s): Embrapa Instrumentação. |
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| 4. | | PÉREZ, M. G.; TORRADO, P. V.; MARTIN-NETO, L.; COLNAGO, L. A.; MILON, D. M. P. B.; GOMES, F. H. Study of humic acids from brazilian spodosol by 13C NMR and FTIR spectroscopy. In: NUCLEAR MAGNETIC RESONANCE USERS MEETING, 10.; PORTUGUESE-BRAZILIAN NMR MEETING, 3.; IBERO AMERICAN NMR MEETING 2005, Angra dos Reis. Abstracts... Angra dos Reis: AUREMN, 2005. p. 107.| Biblioteca(s): Embrapa Instrumentação. |
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| 6. | | ÇIÇEK, S. S.; PÉREZ, M. G; WENZEL-STORJOHANN, A.; BEZERRA, R. M.; SEGOVIA, J. F. O.; GIRRESER, U.; KANZAKI, I.; TASDEMIR, D. Antimicrobial prenylated isoflavones from the leaves of the Amazonian medicinal plant vatairea guianensis Aubl. Journal of Natural Products, v. 85, p. 927-935, 2022.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Amapá. |
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| 7. | | PÉREZ, M. G.; MARTIN-NETO, L.; SAAB, S. C.; NOVOTNY, E. H.; MILORI, D. M. B. P.; BAGNATO, V. S.; COLNAGO, L. A.; MELO, W. J.; KNICKER, H. Characterization of humic acids from a brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy. Geoderma, Amsterdam, v. 118, p. 181-190, 2004.| Biblioteca(s): Embrapa Instrumentação. |
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| 8. | | PÉREZ, M. G.; MARTIN NETO, L.; COLNAGO, L. A.; MILORI, D. M. B. P.; CAMARGO, O. A. de; BERTON, R.; BETTIOL, W. Characterization of humic acids extracted from sewage sludge-amended oxisols by electron paramagnetic resonance. Soil & Tillage Research, Amsterdam, v. 91, p. 95-100, 2006.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 9. | | PÉREZ, M. G.; MILORI, D. M. B. P.; MARTIN NETO, L.; COLNAGO, L. A.; CAMARGO, O. A. de; BERTON, R.; BETTIOL, W. Laser-induced fluorescence of organic matter from a Brazilian oxisol under sewage sludge applications. Scientia Agricola, Piracicaba, v. 63, n. 3, p. 269-275, maio/jun. 2006.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - B |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 10. | | MARTIN NETO, L.; SIMÕES, M. L.; FERREIRA, J. A.; MILORI, D. M. B. P.; SILVA, W. T. L. da; PEREZ, M. G.; NASCIMENTO, O. R.; BAYER, C.; MIELNICZUK, J. Applications of spectroscopies in humic substances research. In: HUMIC SCIENCE AND TECHNOLOGY, 8., 2005, Boston. Aggregation and physiological effects: [abstracts]. Boston: Northeastern University, 2005.| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 10 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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