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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
24/11/2022 |
Data da última atualização: |
24/11/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
TADINI, A. M.; NICOLODELLI, G.; HAJJOUL, H.; MILORI, D. M. B. P.; MOUNIER, S. |
Afiliação: |
DEBORA MARCONDES BASTOS PEREIRA, CNPDIA. |
Título: |
Humic fractions from Amazon soils: Lifetime study and humification process by fluorescence spectroscopy. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Applied Geochemistry, v. 147, a105486, 2022. |
Páginas: |
1-8 |
ISSN: |
0883-2927 |
DOI: |
https://doi.org/10.1016/j.apgeochem.2022.105486 |
Idioma: |
Inglês |
Conteúdo: |
The Amazon Forest is an important and primordial ecosystem, as it controls the dynamics of soil organic matter (SOM) and is considered one of the crucial carbon reservoirs in the world. Based on that, this study evaluated the molecular properties of humic (HA) and fulvic (FA) acid from Amazon soil, with and without Cu(II) ions, by Time-Resolved Laser Fluorescence Spectroscopy (TRLFS) and Fluorescence Spectroscopy (FS). Fluorescence excitation-emission matrix (EEM) was obtained by FS, and EEM spectra were treated by canonical polyadic/ parallel factor analysis (EEM-CP/PARAFAC). The results showed that the humification index (A465nm) determined by FS is directly dependent on fluorophores? CII/CI ratio in these soils with depth (r = 0.89), especially for HA samples in deep horizons, which demonstrated that the CII consists more complex and humified structure of the SOM. The lifetime decay showed the presence of static quenching in the humic fractions. From the lifetime data provided by TRLFS and the different correlations with carbon content and A465nm, it can be suggested that the fluorescence suppression modifies the molecular properties of the humic fractions with the addition of Cu(II) ions, such as altering the mobility and availability of the metal in the complexation reactions in these Amazonian Spodosols, mainly for the fulvic fraction. |
Palavras-Chave: |
Amazon soil; Humic fractions; Humification process; Lifetime; Molecular changes. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02153naa a2200265 a 4500 001 2148734 005 2022-11-24 008 2022 bl uuuu u00u1 u #d 022 $a0883-2927 024 7 $ahttps://doi.org/10.1016/j.apgeochem.2022.105486$2DOI 100 1 $aTADINI, A. M. 245 $aHumic fractions from Amazon soils$bLifetime study and humification process by fluorescence spectroscopy.$h[electronic resource] 260 $c2022 300 $a1-8 520 $aThe Amazon Forest is an important and primordial ecosystem, as it controls the dynamics of soil organic matter (SOM) and is considered one of the crucial carbon reservoirs in the world. Based on that, this study evaluated the molecular properties of humic (HA) and fulvic (FA) acid from Amazon soil, with and without Cu(II) ions, by Time-Resolved Laser Fluorescence Spectroscopy (TRLFS) and Fluorescence Spectroscopy (FS). Fluorescence excitation-emission matrix (EEM) was obtained by FS, and EEM spectra were treated by canonical polyadic/ parallel factor analysis (EEM-CP/PARAFAC). The results showed that the humification index (A465nm) determined by FS is directly dependent on fluorophores? CII/CI ratio in these soils with depth (r = 0.89), especially for HA samples in deep horizons, which demonstrated that the CII consists more complex and humified structure of the SOM. The lifetime decay showed the presence of static quenching in the humic fractions. From the lifetime data provided by TRLFS and the different correlations with carbon content and A465nm, it can be suggested that the fluorescence suppression modifies the molecular properties of the humic fractions with the addition of Cu(II) ions, such as altering the mobility and availability of the metal in the complexation reactions in these Amazonian Spodosols, mainly for the fulvic fraction. 653 $aAmazon soil 653 $aHumic fractions 653 $aHumification process 653 $aLifetime 653 $aMolecular changes 700 1 $aNICOLODELLI, G. 700 1 $aHAJJOUL, H. 700 1 $aMILORI, D. M. B. P. 700 1 $aMOUNIER, S. 773 $tApplied Geochemistry$gv. 147, a105486, 2022.
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2. | | TADINI, A. M.; HAJJOUL, H.; NICOLODELLI, G.; MOUNIER, S.; MONTES, C. R.; MILORI, D. M. B. P. Characterization of organic matter in spodosol amazonian by fluorescence spectroscopy. In: WORD ACADEMY OF SCIENCE ENGINEERING OF TECHNOLOGY, v. 11, n. 5, P. 399-402, 2017.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 4 |
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