APPLICATION OF SOLID-PHASE MICROEXTRACTION (SPME) IN COMBINATION WITHGC FID TO THE DETERMINATION OF BENZENE AND HALOGENATED BENZENES IN PURE AND OCTANOL-SATURATED WATER/

The solid-phase microextraction (SPME) is a new method for the extract ion of organic compounds from aqueous samples which eliminates the use of solvents. Sorbent-coated silica fibres are used to extract the ana lytes from the sample. After extraction, the fibres a re directly tran sferred to the injector of a gas chromatograph and the adsorbed substa nces are thermally desorbed. In combination with GC/FID the SPME proce dure was optimized for the determination of C6H6, C6H5Cl, C6H5Br, 1,2- C6H4Cl2, 1,4-C6H4Cl2, 1,2-C6H4Br2 and 1,4-C6H4Br2 in pure and octanol- saturated water. The procedure was found to be linear for 4-5 orders o f magnitude, the detection limits lay between 0.4 mu g l(-1) and 3.1 m u g l(-1) and the high octanol concentration has no negative influence on the extraction of the analytes.