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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Determinação espectrofotométrica do teor de biodiesel metílico em misturas com óleo diesel / Spectrophotometric determination of methyl biodiesel content in blends with diesel

SILVA, Marcos Alexandro Abreu e 25 November 2009 (has links)
Made available in DSpace on 2014-07-29T15:12:44Z (GMT). No. of bitstreams: 1 Dis Marcos Alexandro Abreu e Silva.pdf: 745368 bytes, checksum: 3b66fd4dbcdf1e21df44eb1b816fde53 (MD5) Previous issue date: 2009-11-25 / In this work it was developed a quantitative analytical methodology to determine the content of methyl biodiesel in diesel fuel through the fatty acid methyl ester reaction with the hydroxylamine hydrochloride in alkaline solutions, which they were acidified and converted to hydroxamic acids, followed by treatment with ferric ion to give the colored ferric hydroxamate complex, and afterwards extract in n-heptane and were analysed by UV-visible spectroscopy. It was made the optimization of the variables that interfere in the reaction, and parameters such as accuracy, precision and the limit of detection (LOD) among other parameters to assess the quality of the method developed it was also evaluated. The results indicated that the method has shown an excellent linearity in small intervals of biodiesel blend levels, an excellent determination coefficient of the calibration curve (R2 > 0.99) at a wide range of wavelength (420-440 nm). As well as it has also shown to be applied in a wide range of methyl biodiesel blend levels in diesel fuel (B1 to B20), and it is suitable to be used in the quality control procedures for the production of BX blends. / Desenvolveu-se neste trabalho uma metodologia analítica quantitativa para determinação do teor de biodiesel metílico em óleo diesel por meio da reação dos ésteres metílicos de ácidos graxos com o cloridrato de hidroxilamina em meio alcalino, os quais são acidificados e convertidos à ácidos hidroxâmicos, seguida pelo tratamento com íons ferro (III) resultando em complexos coloridos de hidroxamato férrico, posteriormente extraídos em n-heptano e analisados por espectroscopia de UV-visível. Fez-se a otimização das variáveis que interferem na reação, e também avaliou-se a exatidão, precisão, e o limite de detecção (LD), entre outros parâmetros, no sentido de avaliar a qualidade do método desenvolvido. O método mostrou excelente linearidade em pequenos intervalos de variação volumétrica de biodiesel, excelente coeficiente de correlação para a curva de calibração (R2 > 0,99), em uma ampla faixa de comprimento de onda (420 a 440 nm). Assim como mostrou ser aplicável em uma ampla faixa de teor de biodiesel metílico em óleo diesel (B1 ao B20), sendo adequado para o controle de qualidade da produção de misturas BX.

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