Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1091
Título: Influência da preparação da amostra nos resultados da análise da composição química da madeira
Autor: Santos, Cláudia Augusto dos
Orientador: Graça, José Afonso
Rodrigues, José Carlos de Carvalho
Palavras-chave: pinus pinaster
eucalyptus globulus
granulometria
análise química
lenhina
extractivos
particle size
chemical analysis
lignin
extractives
Data de Defesa: 2009
Resumo: The main purpose of this study was to assess the impact of the preparation of the samples in the results obtained in the chemical composition analysis of wood. This was studied for Maritime Pine (Pinus pinaster Aiton) and Eucalyptus (Eucalyptus globulus) in samples with different extractives content. The yield in different particle sizes after milling was shown to be influenced by the size and morphology of sieve meshes and level of extractives. The yield in the 40/60 mesh fraction was always relatively low (<22%) Extractives content increased from the most coarse to the finer particle sizes. However, the "particle size" effect was shown to be determined mostly by differences in the chemical composition, as shown by the analysis performed after re-grinding. The methods of extraction, Soxhlet and Soxtec, were shown to have similar accuracies. Regarding the content of Klason lignin, the two coarsest samples showed the occurrence of an incomplete hydrolysis, as evidenced by infrared analysis. The sample of finer particle size, in the case of eucalyptus, had higher lignin content than the other samples. The content of lignin obtained through analytical pyrolysis showed lower values than those obtained by the Klason method.
Descrição: Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/1091
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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