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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/4127

Title: Implementação de um método para a determinação de hidrocarbonetos alifáticos saturados em óleo de girassol por cromatografia gasosa
Authors: Machado, Ana Catarina do Carmo Correia Rodrigues
Advisor: Mourato, Miguel
Vasconcelos, Paula
Keywords: saturated aliphatic hydrocarbons
mineral oil
sunflower oil
gas chromatography
Issue Date: 2011
Publisher: ISA/UTL
Citation: Machado, Ana Catarina do Carmo Correia Rodrigues - Implementação de um método para a determinação de hidrocarbonetos alifáticos saturados em óleo de girassol por cromatografia gasosa. Lisboa: ISA, 2011
Abstract: Mineral oil is a by-product derived from petroleum distillation, applicable in the areas of cosmetics, pharmaceuticals and food, used as food additive when in the proper grade of purity for this propose. However, it can also be considered a contaminant, especially important in sunflower oil, due to the episode of the 100.000 tons of highly contaminated Ukrainian sunflower oil. This experimental work aims at implementing a method for the determination of saturated aliphatic hydrocarbons in sunflower oil by capillary gas chromatography with on column injection and FID detector. For such purpose parameters like linearity, working range, thresholds, precision, accuracy and robustness of the method were evaluated. The results show that the method is linear in the range between 15 and 60 mg.kg-1, with a repeatability limit of 6,11 mg.kg-1 and a variability of results obtained by this method of 0,48 mg.kg-1. The method allows to detect and quantify the analyte from 21 mg.kg-1 and 24 mg.kg-1, respectively. Considering the results obtained in recovery tests and Z-score of 0,5 and 0,04 obtained in inter-laboratory tests, the method is accurate. The robustness of this method is also verified, although it is sensible to the way the integration is performed
Description: Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/4127
Appears in Collections:BISA - Dissertações de Mestrado / Master Thesis

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