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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
12/04/2022 |
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Data da última atualização: |
12/04/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BRAVO, C.; TONIOLO, R.; PELLEGRINI, E.; MILLO, C.; COVELLI, S.; CONTIN, M.; MARTIN NETO, L.; DE NOBILI, M. |
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Afiliação: |
LADISLAU MARTIN NETO, CNPDIA. |
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Título: |
Electron donating properties of humic acids in saltmarsh soils reflect soil geochemical characteristics. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Geoderma, v. 419, 115872, 2022. |
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Páginas: |
1 - 11 |
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ISSN: |
0016-7061 |
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DOI: |
https://doi.org/10.1016/j.geoderma.2022.115872 |
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Idioma: |
Inglês |
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Conteúdo: |
In saltmarsh soils, humic acids (HA) are involved in geochemically important redox processes. The electron donating capacity (EDC) of HA depends on their molecular structure, but also reflects the intensity of biological reduction in tidal environments. We examined twelve soils in three saltmarshes located along a geographical gradient and applied a specific sequential extraction procedure for the isolation of HA fractions bound (BHA) or not (FHA) to the mineral matrix by Ca2+ bridges, and investigated the relationships of their properties, in particular their EDC, with the biogeochemical characteristics of the soils. Spectroscopic assessment was carried out by UV–vis, FTIR and 13C NMR, quantification and characterization of radicals was performed by electron paramagnetic resonance (EPR) spectroscopy. The EDC was determined by using the 2,2′ -azinobis-(3-ethylbenzothiazolinesulfonic acid) (ABTS) decolorization assay and experimental data were fitted to a biphasic model to calculate the contributions of the fast and slow reactions to electron transfer. The results confirmed that the two HA fractions possess different structural characteristics and that BHA present higher EDC values compared to FHA. The EDC of both fractions is strongly related to the geochemical characteristics of soils, and represents an easily measured and highly informative parameter to understand mechanisms affecting redox processes in transitional environments. |
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Palavras-Chave: |
ABTS; EDC; Redox. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02219naa a2200277 a 4500
001 2142167
005 2022-04-12
008 2022 bl uuuu u00u1 u #d
022 $a0016-7061
024 7 $ahttps://doi.org/10.1016/j.geoderma.2022.115872$2DOI
100 1 $aBRAVO, C.
245 $aElectron donating properties of humic acids in saltmarsh soils reflect soil geochemical characteristics.$h[electronic resource]
260 $c2022
300 $a1 - 11
520 $aIn saltmarsh soils, humic acids (HA) are involved in geochemically important redox processes. The electron donating capacity (EDC) of HA depends on their molecular structure, but also reflects the intensity of biological reduction in tidal environments. We examined twelve soils in three saltmarshes located along a geographical gradient and applied a specific sequential extraction procedure for the isolation of HA fractions bound (BHA) or not (FHA) to the mineral matrix by Ca2+ bridges, and investigated the relationships of their properties, in particular their EDC, with the biogeochemical characteristics of the soils. Spectroscopic assessment was carried out by UV–vis, FTIR and 13C NMR, quantification and characterization of radicals was performed by electron paramagnetic resonance (EPR) spectroscopy. The EDC was determined by using the 2,2′ -azinobis-(3-ethylbenzothiazolinesulfonic acid) (ABTS) decolorization assay and experimental data were fitted to a biphasic model to calculate the contributions of the fast and slow reactions to electron transfer. The results confirmed that the two HA fractions possess different structural characteristics and that BHA present higher EDC values compared to FHA. The EDC of both fractions is strongly related to the geochemical characteristics of soils, and represents an easily measured and highly informative parameter to understand mechanisms affecting redox processes in transitional environments.
653 $aABTS
653 $aEDC
653 $aRedox
700 1 $aTONIOLO, R.
700 1 $aPELLEGRINI, E.
700 1 $aMILLO, C.
700 1 $aCOVELLI, S.
700 1 $aCONTIN, M.
700 1 $aMARTIN NETO, L.
700 1 $aDE NOBILI, M.
773 $tGeoderma$gv. 419, 115872, 2022.
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| 14. |  | SOUZA, M. A. de; PIZARRO, E. A.; CARVALHO, M. A.; GROF, B.; SCHULZ, A. L. Avaliacao agronomica de gramineas e leguminosas forrageiras em Planaltina, Distrito Federal, Brasilia. In: REUNION SABANAS, 1., 1992, Brasilia, DF. Red Internacional de Evaluacion de Pastos Tropicales - RIEPT. Brasilia: EMBRAPA-CPAC / [Cali]: CIAT, 1992. p.159-167.| Biblioteca(s): Embrapa Cerrados. |
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| 15. | | CARGNIN, A.; SOUZA, M. A. de; CARNEIRO, P. C. S.; SOFIATTI, V. Interação entre genótipos e ambientes e implicações em ganhos com seleção em trigo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n. 6, p. 987-993, jun. 2006 Título em inglês: Genotypes and environments interaction and its implication in gain with wheat selection.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 18. | | CARGNIN, A.; SOUZA, M. A. de; FRONZA, V.; FOGAÇA, C. M. Genetic and environmental contributions to increased wheat yield in Minas Gerais, Brazil. Scientia Agrícola (Piracicaba, Braz.), v. 66, n. 3, p. 317-322, May/June 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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| 19. | | CARGNIN, A.; SOUZA, M. A. de; FRONZA, V.; FOGAÇA, C. M. Genetic and environmental contributions to incresead wheat yeld in Minas Gerais, Brazil. Scientia Agricola, v.66, n.3, p.317-322, may/jun., 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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| Registros recuperados : 133 | |
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