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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
04/12/2014 |
Data da última atualização: |
04/12/2014 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
CERQUEIRA, W. V.; RITTL, T. F.; PINHEIRO, M. A.; PEREIRA NETTO, A. D.; NOVOTNY, E. H. |
Afiliação: |
W. V. CERQUEIRA, UFF; T. F. RITTL, WAGENINGEN UNIVERSITY; M. A. PINHEIRO, UFF; A. D. PEREIRA NETTO, UFF; ETELVINO HENRIQUE NOVOTNY, CNPS. |
Título: |
Effects of pyrogenic carbon feedstock and pyrolysis temperature on the oxidation kinetic and benzene polycarboxilic acids formation. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
In: MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 17., 2014, Ioannina. Natural organic matter: structure-dynamics innovative applications: book of abstracts. Ioannina: University of Ioannina, 2014. p. 192-193. |
Idioma: |
Inglês |
Conteúdo: |
Pyrogenic carbon (PyC) has a high potential to soil carbon sequestration. Among the methods used to quantify PyC, the method of benzene polycarboxilic acids (BPCA) is well-established. The oxidation step of this method is essential for a reliable PyC quantification. Up to now there are no studies on the influence of feedstock and pyrolysis temperature in the oxidation kinetic of PyC and BPCA formation; and then these are the purposes of this study. For this, different PyC were oxidised at 170 ºC during different times. The data showed similar kinetic curves for all PyC, but different BPCA production depending upon feedstock and pyrolysis temperature. All PyC showed maximum production of BPCA at 6-8 h under nitric acid oxidation at 170 ºC. We concluded that 8 h of nitric acid oxidation at 170 ºC produces a reliable data to PyC quantification, thus representing a robust method. |
Palavras-Chave: |
Ácido benzenopolicarboxílico; Cinética de oxidação; Quantificação de carbono pirogênico. |
Thesagro: |
Ácido; Carbono; Oxidação. |
Thesaurus Nal: |
Acids; biochar; Carbon; Kinetics; Oxidation. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/113022/1/IHSS-Meeting-p.-192-193.pdf
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Marc: |
LEADER 01941nam a2200289 a 4500 001 2001606 005 2014-12-04 008 2014 bl uuuu u00u1 u #d 100 1 $aCERQUEIRA, W. V. 245 $aEffects of pyrogenic carbon feedstock and pyrolysis temperature on the oxidation kinetic and benzene polycarboxilic acids formation.$h[electronic resource] 260 $aIn: MEETING OF THE INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 17., 2014, Ioannina. Natural organic matter: structure-dynamics innovative applications: book of abstracts. Ioannina: University of Ioannina, 2014. p. 192-193.$c2014 520 $aPyrogenic carbon (PyC) has a high potential to soil carbon sequestration. Among the methods used to quantify PyC, the method of benzene polycarboxilic acids (BPCA) is well-established. The oxidation step of this method is essential for a reliable PyC quantification. Up to now there are no studies on the influence of feedstock and pyrolysis temperature in the oxidation kinetic of PyC and BPCA formation; and then these are the purposes of this study. For this, different PyC were oxidised at 170 ºC during different times. The data showed similar kinetic curves for all PyC, but different BPCA production depending upon feedstock and pyrolysis temperature. All PyC showed maximum production of BPCA at 6-8 h under nitric acid oxidation at 170 ºC. We concluded that 8 h of nitric acid oxidation at 170 ºC produces a reliable data to PyC quantification, thus representing a robust method. 650 $aAcids 650 $abiochar 650 $aCarbon 650 $aKinetics 650 $aOxidation 650 $aÁcido 650 $aCarbono 650 $aOxidação 653 $aÁcido benzenopolicarboxílico 653 $aCinética de oxidação 653 $aQuantificação de carbono pirogênico 700 1 $aRITTL, T. F. 700 1 $aPINHEIRO, M. A. 700 1 $aPEREIRA NETTO, A. D. 700 1 $aNOVOTNY, E. H.
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Embrapa Solos (CNPS) |
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Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
19/07/2019 |
Data da última atualização: |
19/11/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
AQUINO, A. M. de; CANELLAS, L. P.; SILVA, A. P. S. da; CANELLAS, N. O.; LIMA, L. da S.; OLIVARES, F. L.; PICCOLO, A.; SPACCINI, R. |
Afiliação: |
ADRIANA MARIA DE AQUINO, CNPAB; UENF; UENF; UENF; UENF; UENF; Università di Napoli Federico; Università di Napoli Federico. |
Título: |
Evaluation of molecular properties of humic acids from vermicompost by 13 C CPMAS NMR spectroscopy and thermochemolysis GC MS |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Journal of Analytical and Applied Pyrolysis, v .141, 104634, August 2019. |
DOI: |
https://doi.org/10.1016/j.jaap.2019.104634 |
Idioma: |
Inglês |
Conteúdo: |
The molecular characteristics of different vermicomposts, produced with variable rates of cattle manure and cotton residues, and of related humic acids were determined by 13C-CPMAS NMR and Off-line pyrolysis THM-GC?MS. The analyses highlighted a composition of mature vermicomposts based on differential amounts of lignocellulosic fraction and alkyl compounds inherited from original biomasses, thus revealing a decrease of overall hydrophobic character at increasing amounts of cotton input. The evaluation of molecular parameters derived from both solid state NMR spectra and from the specific biomarkers released by thermochemolysis suggested that the humification process was mainly characterized by the selective preservation of specific lignin derivatives. The potential bioactive properties of humic acids were hence evaluated in a bioassays test on maize seedlings. The humic extracts showed a differential response in root growth-promoting effect, depending on the specific molecular features. The higher bioactivity found in humic components isolated from vermicompost with no or low addition of cotton residues, supported the role of the overall hydrophobic character and of the large content of bioavailable lignin units and nitrogen moieties. These results confirm that the combination of solid state NMR and thermochemolysis are valuable and efficient tools to assess the molecular quality of natural organic matter. The detailed molecular characterization of compost materials may hence represent a useful requirement to select the most suitable application of bulk biomasses and derived fractions for soil organic matter managements. MenosThe molecular characteristics of different vermicomposts, produced with variable rates of cattle manure and cotton residues, and of related humic acids were determined by 13C-CPMAS NMR and Off-line pyrolysis THM-GC?MS. The analyses highlighted a composition of mature vermicomposts based on differential amounts of lignocellulosic fraction and alkyl compounds inherited from original biomasses, thus revealing a decrease of overall hydrophobic character at increasing amounts of cotton input. The evaluation of molecular parameters derived from both solid state NMR spectra and from the specific biomarkers released by thermochemolysis suggested that the humification process was mainly characterized by the selective preservation of specific lignin derivatives. The potential bioactive properties of humic acids were hence evaluated in a bioassays test on maize seedlings. The humic extracts showed a differential response in root growth-promoting effect, depending on the specific molecular features. The higher bioactivity found in humic components isolated from vermicompost with no or low addition of cotton residues, supported the role of the overall hydrophobic character and of the large content of bioavailable lignin units and nitrogen moieties. These results confirm that the combination of solid state NMR and thermochemolysis are valuable and efficient tools to assess the molecular quality of natural organic matter. The detailed molecular characterization of compost materials may hen... Mostrar Tudo |
Palavras-Chave: |
Cotton residues Humic extracts; Cow manure; Molecular characterization; Structura ctivity; Vermicompost. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02560naa a2200277 a 4500 001 2110756 005 2019-11-19 008 2019 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.jaap.2019.104634$2DOI 100 1 $aAQUINO, A. M. de 245 $aEvaluation of molecular properties of humic acids from vermicompost by 13 C CPMAS NMR spectroscopy and thermochemolysis GC MS$h[electronic resource] 260 $c2019 520 $aThe molecular characteristics of different vermicomposts, produced with variable rates of cattle manure and cotton residues, and of related humic acids were determined by 13C-CPMAS NMR and Off-line pyrolysis THM-GC?MS. The analyses highlighted a composition of mature vermicomposts based on differential amounts of lignocellulosic fraction and alkyl compounds inherited from original biomasses, thus revealing a decrease of overall hydrophobic character at increasing amounts of cotton input. The evaluation of molecular parameters derived from both solid state NMR spectra and from the specific biomarkers released by thermochemolysis suggested that the humification process was mainly characterized by the selective preservation of specific lignin derivatives. The potential bioactive properties of humic acids were hence evaluated in a bioassays test on maize seedlings. The humic extracts showed a differential response in root growth-promoting effect, depending on the specific molecular features. The higher bioactivity found in humic components isolated from vermicompost with no or low addition of cotton residues, supported the role of the overall hydrophobic character and of the large content of bioavailable lignin units and nitrogen moieties. These results confirm that the combination of solid state NMR and thermochemolysis are valuable and efficient tools to assess the molecular quality of natural organic matter. The detailed molecular characterization of compost materials may hence represent a useful requirement to select the most suitable application of bulk biomasses and derived fractions for soil organic matter managements. 653 $aCotton residues Humic extracts 653 $aCow manure 653 $aMolecular characterization 653 $aStructura ctivity 653 $aVermicompost 700 1 $aCANELLAS, L. P. 700 1 $aSILVA, A. P. S. da 700 1 $aCANELLAS, N. O. 700 1 $aLIMA, L. da S. 700 1 $aOLIVARES, F. L. 700 1 $aPICCOLO, A. 700 1 $aSPACCINI, R. 773 $tJournal of Analytical and Applied Pyrolysis, v .141, 104634, August 2019.
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