OCPs were analyzed on an Agilent-5975 GC-MSD system with a
HP-5MS capillary column (30 m, 0.25 mm, 0.25 lm), operating under
a single ion monitoring (SIM) mode with a detector voltage of
500 V, a scan range of m/z 30–500 and a dwell time of 50 ms for
each ion. Helium was used as carrier gas at 1.0 mL/min under constant-flow
mode. The oven temperature began at 80 C and was increased
to 200 C (2-min hold time) at a rate of 15 C min1
. It was
then increased to 250 C (1-min hold time) at a rate of 10 C min1
before being raised to 290 C (5-min hold time) at 20 C min1
.
Then splitless injection was performed with an injection volume
of 1 lL.
The reco