Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/6978
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Type: Artigo de Periódico
Issue Date: Aug-2015
Authors: MORAES, Milena Carvalho de
LEMOS, Vanda Porpino
MORAES, Dorsan dos Santos
MORAES, Cláudio Nery Lamarão
Title: Characterization and distribution of pyrogenic carbon in a fraction of archaeological black earth from Caxiuanã
Citation: MORAES, Milena Carvalho de et al. Characterization and distribution of pyrogenic carbon in a fraction of archaeological black earth from Caxiuanã. Journal of the Brazilian Chemical Society, São Paulo, v. 26, n. 8, p. 1664-1673, ago. 2015. Disponível em: <http://www.scielo.br/pdf/jbchs/v26n8/0103-5053-jbchs-26-08-1664.pdf>. Acesso em: 5 nov. 2015. <http://dx.doi.org/10.5935/0103-5053.20150140>.
Abstract: This study aims to determine the atomic ratio of O/C in an archaeological black earth (ABE) profile of the Ilha de Terra site, a region of Caxiuanã in the Pará State, Brazil, to determine the types of pyrogenic carbon (PyC) particles and to infer the source of biomass and burning temperature necessary to produce the PyC. The O/C ratios were monitored using scanning electron microscopy combined with energy dispersive spectroscopy (SEM/EDS). The results indicated atomic ratios for clay, silt and fine sand fractions that were between those registered for the PyC particles types: condensed combustion (CC) (0.09, 0.1, 0.13), charcoal (0.32, 0.31, 0.34) and char (0.43, 0.45, 0.52). CC is the predominant type of particle found because of the high firing temperature (> 350 °C), which is consistent with the probable biomass sources of wood, cellulose and lignin.
Keywords: Carbono pirogênico
Terra preta arqueológica
Combustão condensada
Sítio arqueológico Ilha Preta - PA
Floresta Nacional de Caxiuanã - PA
Portel - PA
Pará - Estado
Amazônia Brasileira
ISSN: 1678-4790
Appears in Collections:Artigos Científicos - ICEN

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