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. The oven temperature
was programmed for 30 ◦C for 1min, 10 ◦C/min to 60 ◦C,
then 30 ◦C/min to 150 ◦C, and 220 ◦C for 10 min after the run to
clean any contaminants that might be released by the SPME fiber
from the column.