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| Registros recuperados : 17 | |
| 3. |  | NOVOTNY, E. H.; KNICKER, H.; MARTIN NETO, L.; AZEREDO, R. B. V.; HAYES, M. H. B. Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach. European Journal of Soil Science, Oxford, v. 59, n. 3, p. 439-444, Jun. 2008.| Biblioteca(s): Embrapa Solos. |
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| 8. | | POTES, M. da L.; DICK, D. P.; DALMOLIN, R. S.; KNICKER, H.; ROSA, A. S. da. Matéria orgânica em neossolos de altitude: influência do manejo da pastagem na sua composição e teor. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 34, n. 1, p. 23-32, jan./fev. 2010. Título em Inglês: Soil organic matter in highland leptosols: influence of pasture management on composition and content.| Biblioteca(s): Embrapa Solos / UEP-Recife. |
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| 9. | | DIEKOW, J.; MIELNICZUK, J.; GONZALEZ-VILA, F. J.; KNICKER, H.; BAYER, C.; MARTIN NETO, L. Matéria orgânica do solo em sistemas de culturas caracterizada por pirólise analítica. LATIN AMERICAM SYMPOSIUM ON SCANNING PROBE MICROSCOPY, 3., 2005, Ouro Preto. [Anais eletrônicos...]. Ouro Preto: SBMN, 2005. 1 CD-ROM.| Biblioteca(s): Embrapa Instrumentação. |
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| 11. | | LEAL, O. A.; DICK, D. P.; COSTA, F. de S.; KNICKER, H.; CARVALHO JÚNIOR, J. A. de; SANTOS, J. C. Carbon in physical fractions and organic matter chemical composition of an acrisol after amazon forest burning and conversion into pasture. Journal of the Brazilian Chemical Society, v. 30, n. 2, p. 413-424, 2019.| Biblioteca(s): Embrapa Acre. |
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| 12. | | GONZÁLEZ PÉREZ, M.; NUNO, C. S.; COLNAGO, L. A.; KNICKER, H.; TORRADO, P. V.; MARTIN NETO, L. Evaluation of magnetic field effect on quantification of aromatic components of humic acids by 13C CPMAS NMR. In: NUCLEAR MAGNETIC RESONANCE USERS MEETING, 11., 2007. Angra dos Reis.; WORKSHOP NMR IN SOUTH AMERICA, 2007. Angra dos Reis, RJ. Extended abstracts book... Angra dos reis, 2007. p. 101-102.| Biblioteca(s): Embrapa Instrumentação. |
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| 13. | | NOVOTNY, E. H.; MARTIN-NETO, L.; KNICKER, H.; DE MARIA, I. C.; DECHEN, S. C. F.; VIEIRA, S. R. Efeito de diferentes sistemas de preparo do solo nos ácidos húmicos - caracterização pela espectroscopia de ressonância magnética nuclear de 13C. In: ENCONTRO BRASILEIRO DE SUBSTÂNCIAS HÚMICAS-IHSS, 4., 2001, Viçosa. IHSS 2001: resumos de palestras e trabalhos apresentados. Viçosa: UFV-Departamento de Solos: Grupo Brasileiro da IHSS, 2001. p. 129-131.| Biblioteca(s): Embrapa Instrumentação. |
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| 14. | | 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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| 15. | | DICK, D. P.; GONÇALVES, C. N.; DALMOLIN, R. S. D.; KNICKER, H.; KLAMT, E.; KÖGEL-KNABNER, I.; SIMÕES, M. L.; MARTIN-NETO, L. Characteristics of soil organic matter of different Brazilian ferrasols under native vegetation as a function of soil depth. Geoderma: an international journal of soil science , Amsterdam, v. 124, n. 3-4, p. 319-333, Feb. 2005. Disponível em: . Acesso em: 10 jan. 2006.| Biblioteca(s): Embrapa Instrumentação. |
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| 16. | | BOENI, M.; BAYAER, C.; DIECKOW, J.; CONCEIÇÃO, P. C.; DICK, D. P.; KNICKER, H.; SALTON, J. C.; MACEDO, M. C. M. Organic matter composition in density fractions of Cerrado Ferralsolsas revealed by CPMAS13C NMR: influence of pastureland, croplandand integrated crop-livestock. ,Agrculture, Ecosystems & Environment, Amsterdan v. 181, 2013.| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 17. | | LEAL, O. dos A.; JIMÉNEZ-MORILLO, N. T.; GONZÁLEZ-PÉREZ, J. A.; KNICKER, H.; COSTA, F. de S.; JIMÉNEZ-MORILLO, P. N.; CARVALHO JUNIOR, J. A. de; SANTOS, J. C. dos; DICK, D. P. Soil organic matter molecular composition shifts driven by forest regrowth or pasture after slash-and-burn of Amazon Forest. International Journal of Environmental Research and Public Health, v. 20, n. 4, 3485, Feb. 2023.| Biblioteca(s): Embrapa Acre. |
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| Registros recuperados : 17 | |
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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
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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: |
Artigo em Periódico Indexado |
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Autoria: |
NOVOTNY, E. H.; KNICKER, H.; COLNAGO, L. A.; MARTIN NETO, L. |
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Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; HEIKE KNICKER; LUIZ ALBERTO COLNAGO, CNPDIA; LADISLAU MARTIN NETO, CNPDIA. |
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Título: |
Effect of residual vanadyl on the spectroscopic analysis of humic acids. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Organic Geochemistry, v. 37, n. 11, p. 1562-1572, Nov. 2006. |
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DOI: |
https://doi.org/10.1016/j.orggeochem.2006.06.015 |
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Idioma: |
Inglês |
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Notas: |
Na publicação: Ladislau Martin-Neto. |
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Conteúdo: |
The effect of residual vanadyl (VO2+) on data derived from the analysis of humic acids (HAs) by means of fluorescence spectroscopy, solid-state 13C nuclear magnetic resonance spectroscopy (NMR) and UV-Vis spectroscopy was examined in order to reveal potential organic groups involved in metal complexation. The HAs were extracted from agricultural soils from an experimental station in Campinas, Brazil. Their paramagnetic ion content was determined using electron paramagnetic resonance (EPR). Because of the well-resolved EPR signal, the VO2+ ion content was used for the correlation studies. The latter clearly demonstrated that residual VO2+ affects the spectroscopic data and that, besides the intrinsic structural characteristic of HAs, the impact of paramagnetic ions must be considered for careful interpretation of such data. On the other hand, analysis of these effects can give additional structural information. With respect to the UV-Vis spectra, the positive correlation between VO2+ content and the absorption at 665 nm (E6) was attributed to the presence of VO2+ complexes. Further support for metal-humic substance binding was extracted by way of a reduction in the fluorescence intensity with increasing VO2+ concentration for both excitation and emission. A relationship between the suppression of the intensity of the O-alkyl, di-O-alkyl and carboxyl C signals in the solid-state 13C NMR spectra and the VO2+ content demonstrated the involvement of carbohydrates in metal complexation, probably in the uronic acid form. No clear correlation was observed with respect to the O-aryl C signal, which may be due to a low accessibility of the metallic ion to methyl- substituted O-aryl groups as they occur in lignin derivatives. MenosThe effect of residual vanadyl (VO2+) on data derived from the analysis of humic acids (HAs) by means of fluorescence spectroscopy, solid-state 13C nuclear magnetic resonance spectroscopy (NMR) and UV-Vis spectroscopy was examined in order to reveal potential organic groups involved in metal complexation. The HAs were extracted from agricultural soils from an experimental station in Campinas, Brazil. Their paramagnetic ion content was determined using electron paramagnetic resonance (EPR). Because of the well-resolved EPR signal, the VO2+ ion content was used for the correlation studies. The latter clearly demonstrated that residual VO2+ affects the spectroscopic data and that, besides the intrinsic structural characteristic of HAs, the impact of paramagnetic ions must be considered for careful interpretation of such data. On the other hand, analysis of these effects can give additional structural information. With respect to the UV-Vis spectra, the positive correlation between VO2+ content and the absorption at 665 nm (E6) was attributed to the presence of VO2+ complexes. Further support for metal-humic substance binding was extracted by way of a reduction in the fluorescence intensity with increasing VO2+ concentration for both excitation and emission. A relationship between the suppression of the intensity of the O-alkyl, di-O-alkyl and carboxyl C signals in the solid-state 13C NMR spectra and the VO2+ content demonstrated the involvement of carbohydrates in metal complex... Mostrar Tudo |
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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 02368naa a2200193 a 4500
001 2135467
005 2021-10-20
008 2006 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.orggeochem.2006.06.015$2DOI
100 1 $aNOVOTNY, E. H.
245 $aEffect of residual vanadyl on the spectroscopic analysis of humic acids.$h[electronic resource]
260 $c2006
500 $aNa publicação: Ladislau Martin-Neto.
520 $aThe effect of residual vanadyl (VO2+) on data derived from the analysis of humic acids (HAs) by means of fluorescence spectroscopy, solid-state 13C nuclear magnetic resonance spectroscopy (NMR) and UV-Vis spectroscopy was examined in order to reveal potential organic groups involved in metal complexation. The HAs were extracted from agricultural soils from an experimental station in Campinas, Brazil. Their paramagnetic ion content was determined using electron paramagnetic resonance (EPR). Because of the well-resolved EPR signal, the VO2+ ion content was used for the correlation studies. The latter clearly demonstrated that residual VO2+ affects the spectroscopic data and that, besides the intrinsic structural characteristic of HAs, the impact of paramagnetic ions must be considered for careful interpretation of such data. On the other hand, analysis of these effects can give additional structural information. With respect to the UV-Vis spectra, the positive correlation between VO2+ content and the absorption at 665 nm (E6) was attributed to the presence of VO2+ complexes. Further support for metal-humic substance binding was extracted by way of a reduction in the fluorescence intensity with increasing VO2+ concentration for both excitation and emission. A relationship between the suppression of the intensity of the O-alkyl, di-O-alkyl and carboxyl C signals in the solid-state 13C NMR spectra and the VO2+ content demonstrated the involvement of carbohydrates in metal complexation, probably in the uronic acid form. No clear correlation was observed with respect to the O-aryl C signal, which may be due to a low accessibility of the metallic ion to methyl- substituted O-aryl groups as they occur in lignin derivatives.
650 $ahumic acids
700 1 $aKNICKER, H.
700 1 $aCOLNAGO, L. A.
700 1 $aMARTIN NETO, L.
773 $tOrganic Geochemistry$gv. 37, n. 11, p. 1562-1572, Nov. 2006.
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