The poly (trifluoropropyl) methylsiloxane (PTFPMS) coating was prepared as solid-phase microextraction (SPME) coating by sol-gel technique. The coating has a porous microstructure and the thickness was 10 microm. Since the PTFPMS phase contains the functional group of -C2H4CF3, it exhibits high affinity to compounds containing electron-attracting groups. The PTFPMS phase can withstand desorption temperature up to 280 degrees C. The lifetime of the fiber SPME is more than 150 times. This coating was used to analyse the phenolic compounds in water samples by head-space solid-phase microextraction (HS-SPME) method. The parameters affecting the extraction efficiency, such as extraction mode, extraction temperature, extraction time, ion strength and pH, were optimized. The limits of detection (LODs) of the method were 0.02 - 1.2 microg/L. The relative standard deviations (RSDs) of single fiber and fiber-to-fiber (n = 5 ) were less than 4.4%, and 15.7%, respectively. The results indicated that the sol-gel method has good repeatability for the preparation of the PTFPMS coating.
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