DECEA - Departamento de Ciências Exatas e Aplicadas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/551
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Resultados da Pesquisa
Item Determination of formaldehyde in hair creams by gas chromatography-mass spectrometry.(2015) Lobo, Fabiana Aparecida; Santos, Talysson Manoel de Oliveira; Vieira, Karla Moreira; Osório, Vanessa Moreira; Taylor, Jason GuyItem Development of a method to determine Ni and Cd in biodiesel by graphite furnace atomic absorption spectrometry.(2011) Lobo, Fabiana Aparecida; Goveia, Danielle; Oliveira, Adriana Paiva de; Romão, Luciane Pimenta Cruz; Fraceto, Leonardo Fernandes; Dias Filho, Newton Luiz; Rosa, André HenriqueThis paper proposes a low cost, simple, fast method for determining Ni and Cd in biodiesel samples by graphitefurnaceatomicabsorptionspectrometry (GFAAS). The method was evaluated in biodiesel from different sources. Tungsten was used as a permanent modifier and the samples were prepared in the form of microemulsions, by mixing about 0.5 g of biodiesel with 5 g of surfactant (Triton X-100) in volumetric flasks and completing the volume with HNO3 1% (v/v). The detection limits obtained for Ni and Cd in microemulsions were ≤0.9 and 0.1 μg L−1, respectively. The relative standard deviation (% R.S.D., n = 12) was ≤8.20% for Ni (washed animal fat sample) and ≤4.71% for Cd (sunflower oil sample). Accuracy was checked based on addition and recovery experiments, which yielded recovery rates varying from 93% to 108% for Ni and from 98% to 116% for Cd. Sample preparation is rapid and easy, and the use of an inorganic standard for calibration makes this sample preparation procedure suitable for routine applications.