Oil sample analysis was achieved on an Hp-6890 gas chromatograph equipped with an FID and a DB-5 capillary column, 30 m × 0.25 mm, 0.25 μm film thickness, temperature was programmed as follows: 60 °C −240 °C at 4 °C/ min. The carrier gas was N2 at a flow of 2.0 ml/min; injector port and detector temperature were 250 °C and 300 °C, respectively. The sample was injected by splitting and the split ratio was 1:10.
GC/MS analysis was done on a Hewlett-Packard 6890 /5972 system with a DB-5 capillary column (30 m × 0.25 mm; 0.25 μm film thickness). The operating conditions were the same conditions as described above but the carrier gas was He. Mass spectra were taken at 70 eV. Scan mass range was from 40–400 m/z at a sampling rate of 1.0 scan/s. Quantitative data were obtained from the electronic integration of the FID peak areas. The components of the oil were known by their retention time, retention indices, relative to C9-C28 n-alkanes, computer matching with the WILEY275.L library, as well as by comparison of their mass spectra with data already available in the literature (10 ). The percentage of composition of the identified compounds was computed from the GC peaks areas without any correction factors and was calculated relatively.
GC/MS analysis was done on a Hewlett-Packard 6890 /5972 system with a DB-5 capillary column (30 m × 0.25 mm; 0.25 μm film thickness). The operating conditions were the same conditions as described above but the carrier gas was He. Mass spectra were taken at 70 eV. Scan mass range was from 40–400 m/z at a sampling rate of 1.0 scan/s. Quantitative data were obtained from the electronic integration of the FID peak areas. The components of the oil were known by their retention time, retention indices, relative to C9-C28 n-alkanes, computer matching with the WILEY275.L library, as well as by comparison of their mass spectra with data already available in the literature (10 ). The percentage of composition of the identified compounds was computed from the GC peaks areas without any correction factors and was calculated relatively.