EVALUATION OF STIR BAR SORPTIVE EXTRACTION FOR DETERMINATION OF CHLOROPHENOLS IN WATER SAMPLES USING GC-MS

The paper shows possible applications of a mobile sorptive unit that consisted of a polydimethylsiloxane ( PDMS) stir bar to the determination of chlorophenols in water. Due to the high costs of thermal desorption devices, the release of chlorophenols from the sorptive unit into organic solvent was carried out in an ultrasonic field. Both the extraction time and the type of organic solvent were selected experimentally. The qualitative composition of the extract was studied by gas chromatography - mass spectrometry (GC - MS). The following optimum conditions for chlorophenols assays in water by SBSE - LD - GC/MS were determined: extraction time - 120 min., desorption with ethyl acetate - 15 min. The Stir Bar Sorptive Extraction (SBSE) used in the study is competitive with commonly used extraction techniques such as Solid Phase Extraction (SPE), Solid Phase Microextraction (SPME) or Liquid Phase Microextraction (LPME).