The prepared fiber was conditioned prior to each extraction by
leaving it in the injection port for 10 min at 270 C. A special SPME
device (Azar Electrod Co., Oroumie, Iran) was used for holding and
injection of the proposed fiber into the GC–MS injection port.
A 20 mL glass bottle sealed with rubber septum was used as a
sample container. The bottle was held in the ultrasonic bath during
the extraction. Then, the SPME device was fixed on top of the
capped vial and the fabricated fiber was exposed to the sample head
space after a sonicating step. After sample extraction, the fiber was
withdrawn from the bottle and inserted into the GC–MS injection
port in order to evaporate absorbed analytes for analysis.