An integrated method of dynamic extraction of perchloroethylene (PCE) with polydimethylsiloxane (PDMS) helical solid sorbent followed by injection into a gas chromatograph was developed for the determination of the real concentration of PCE in groundwater before and after its degradation by oxidation with KMnO4. The main parameters (agitation, temperature, salts, pH) that affect the extraction efficiency have been evaluated and optimized. The increase

The analysis of benzene, toluene and xylene by micro extraction into a three phase extraction system (liquid-liquid-solid) followed by gas chromatography is described. The analytes are extracted very fast into a very small volume of organic solvent and simultaneously into a solid sorbent. The efficiency of different solvents: dichloromethane, chlorophorm, carbon tetrachloride, n-hexane and cyclohexane added to the sample in different volumes used

A new technique for the analysis of volatile aromatic hydrocarbons by combining liquid– liquid microextraction with solid phase microextraction has been developed. The analytes were extracted from aqueous samples by an immobilized polydimethylsiloxane fiber assisted by the droplets of an appropriate organic solvent. Benzene, toluene, ethylbenzene, and o-xylene were used as target analytes. The main factors potentially affecting the microextraction