Determination of trace xylene in contaminated palm oil by solid phase micro-extraction and capillary gas chromatography

Solid phase micro-extraction (SPME) was used to concentrate trace toluene and xylene in a batch of contaminated imported. palm oil. The sample was put in a bottle sealed with rubber septum and kept at 60 degrees C in water-bath, an SPME apparatus was injected in head-space of the bottle, equilibriated for one munite,, where the volatile organic analytes were-adsorbed by: the SPME fiber, then introduced into the gas chromatographic injector directly. Benzene was used as internal standard and bean oil as simulated matrix to make calibration curves, which-were linear in the range of 0.2 similar to 20 mg/kg. The RSD wer in the range of 2.3% similar to 5.3%, the detection limit of toluene and xylene in palm oil was 0.05 mg/kg and 0.6 mg/kg respectively.