The chromatographic system used was a thermo electron trace
gas chromatograph (GC), equipped with a POLARIS Q model
ion trap mass spectrometer with EI and CI ionization modes; a
30m×0.25mm i.d.×0.25m film capillary column containing 5%
diphenyl, 95% dimethylpolysiloxane-HP-5MS(Hewlett-Packard) as
the stationary phase and X CALIBUR data acquisition.