The GC/MS technique (HP. 5890A) was used to identify
the apium graveolens essential oil constituents, under the
following conditions: packed capillary column
(50m×0.2mm×0.3 thickness film of carbowax 20M), Helium
was used as a carrier gas at flow rate 20 cm/sec, HP 7673A
automatic injector was used to inject 2.0 μL of diluted
samples in ethyl alcohol (1:10, v/v) with split ratio 100:1, at
150°C, the oven temperature ( programmed) was set at 60°C
for l0min and increasing gradually by the rate of 2.8°C/min
to the final temperature (200°C) during 60 min. Mass
spectrum was used to identify the constituents by comparing
the samples spectrum with the data stored in Chemstation
library which containing over 43,000 compounds.