Data/hora: 10/06/2024 18:32:18

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 24/10/2018
Data da última atualização: | 24/10/2018
Autoria: | TAUBE, P. S.; SILVA, D. S.; VASCONCELOS, A. A.; REBELLATO, L.; MADEUREIRA, L. A. dos S.; HANSEL, F. A.
Afiliação: | Paulo S. Taube, Universidade Federal do Oeste do Pará; Douglas S. Silva, Universidade Federal do Oeste do Pará; Arthur A. Vasconcelos, Universidade Federal do Oeste do Pará; Lilian Rebellato, Universidade Federal do Oeste do Pará; Luiz A. dos Santos Madureira, Universidade Federal de Santa Catarina; FABRICIO AUGUSTO HANSEL, CNPF.
Título: | Exploratory on-line pyrolysis and thermally assisted hydrolysis and methylation for evaluating non-hydrolyzable organic matter in anthropogenic soil from Central Brazilian Amazon.
Ano de publicação: | 2018
Fonte/Imprenta: | Brazilian Journal of Analytical Chemistry, v. 5, n. 19, p. 38-53, Jan. 2018.
DOI: | 10.30744/brjac.2179-3425.2018.5.19.38-53
Idioma: | Inglês
Conteúdo: | Amazonian dark earths (ADE) are characterized by high fertility and organic carbon content, the latter being associated with black carbon (BC). BC is recalcitrant in nature due to its aromatic building blocks and it is expected to remain in the non-hydrolyzable fraction after the sequential extraction of soil organic matter (SOM). In this context, the aim of this study was to compare the composition of non-hydrolyzable SOM samples from an ADE and an adjacent soil using pyrolysis - gas chromatography - mass spectrometry and thermally-assisted hydrolysis and methylation with tetramethylammonium hydroxide. We tested two hypotheses: (i) non-hydrolyzable organic matter preserves BC in ADE and adjacent soils; and (ii) pyrolysis products are also produced thermally and are different for ADE and adjacent soils. The results of this study showed that polycyclic aromatic hydrocarbons were the main pyrolysis products for both soils. In addition, the benzene / toluene, naphthalene / methylnaphthalene and benzofuran / methylbenzofuran ratios of the pyrolysis products observed in the case of ADE were around two times higher than the corresponding values for the adjacent soil, except in the surface horizon, which indicates the presence of a higher recalcitrant BC in the ADE. The specific organic matter sources for the ADE and adjacent soil could not be differentiated.
Palavras-Chave: | Black carbon; Py-GC-MS; THM-GC-MS.
Thesagro: | Carbonização; Carvão.
Thesaurus Nal: | Carbonization; Charcoal.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (56517-1) - UPC - AP - DD -  -  -  - DIS