ABSTRACT.- Solid Phase Microextraction or SPME was created to facilitate faster sample preparation, both in the laboratory and wherever the sampling site is located. Solid phase microextraction (SPME) was developed by Pawliszyn's group in 1990 as a solvent-free technique on the basis of adsorption-absorption theory. SPME is based on the principle that analytes are distributed between the sample matrix and the fiber coating. The fiber is built of fused silica and covered with a sorbent (polymeric materials identical to those used as stationary phase in gas chromatography columns).