APPLICATION OF DYNAMIC LIQUID-PHASE MICROEXTRACTION TO THE ANALYSIS OF CHLOROBENZENES IN WATER BY USING A CONVENTIONAL MICROSYRINGE

A dynamic liquid-phase microextraction technique combined with gas chr omatography/mass spectrometry (GC/MS) is described for the extraction of 10 chlorobenzenes from water samples into 1 mu L of organic solvent by using a conventional microsyringe, The effects of extraction solve nt, plunger movement pattern, sampling volume, number of samplings, an d salt concentration on the extraction performance were investigated. Good repeatabilities of extraction were obtained, with the RSD values below 5.3% except for hexachlorobenzene (9.3%), By using a sampling vo lume of 6 mu L and 15 samplings, detection limits were found to be bet ween 0.02 and 0.05 mu g/L under GC/MS-selective ion monitoring mode.