Cape Peninsula University of Technology, South Africa
Two oil sample were assembled, and their paraffinic and naphthenic content were analysed using GC-MS to decompose each primary components. It is believed that lighter compounds revealed at a shorter retention time as compared to heavier compounds. Some paraffin compounds in the crude oil exposed their visibility on the chromatographic by repeatedly themselves on various retention time. Decane, 4-methyl (RT: 11.32, 11.32), Undecane, 5-methyl (RT: 14.8504, 14.9607), Tetradecane (RT: 20.67, 25.8346), Hexadecane (RT: 21.9112, 24.0211, 36.3431, 42.7557), Tetracosane (RT: 37.7221, 49.1614), Pentacosane (RT: 39.0529, 41.5697) and Octacosane (RT: 40.3355, 46.0999, 47.148, 48.1685) were the compounds obtained from the GC-MS analysis at various retention time. The paraffin content of the fuel oil named Heptacosane was the only compound revealed at a various retention time (RT: 42.7143, 43.8658, 44.9828, 46.0654, 47.1204). However, 12, 12% naphthene was present in the crude oil, and none in fuel oil. The crude oil was found to be more paraffinic by 54, 55% then fuel oil by 29%. Furthermore, the viscosity and the impurities content of the fuel oil was greater than the crude oil. Crude oil sulphur content of 565mg/L and fuel oil sulphur content of 2391mg/L were the analyses obtained by the ICP-MS which identified the sweetness and sourness of the oil. Both crude and fuel oil were sweetly referenced to the sulphur concentration. However, the sulphur content was predominant in the fuel oil in which therefore classified the crude oil to be sweeter than the fuel oil.
Keywords: Parrafins; Naphthenes; Retention time.