Abstract:

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 μm. 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

℃. 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 μg/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.

Key words: phenolic compounds, poly(trifluoropropyl)methylsiloxane, sea water solid-phase microextraction (SPME), stir bar sorptive extraction (SBSE), sol-gel technique