Application of dynamic liquid-phase microextraction to the analysis of chlorobenzenes in water by using a conventional microsyringe

Abstract

A dynamic liquid-phase microextraction technique combined with gas chromatography/mass spectrometry (GC/ MS) is described for the extraction of 10 chlorobenzenes from water samples into 1 μL of organic solvent by using a conventional microsyringe. The effects of extraction solvent, plunger movement pattern, sampling volume, number of samplings, and salt concentration on the extraction performance were investigated. Good repeat-abilities of extraction were obtained, with the RSD values below 5.3% except for hexachlorobenzene (9.3%). By using a sampling volume of 6 μL and 15 samplings, detection limits were found to be between 0.02 and 0.05 μg/L under GC/MS-selective ion monitoring mode. © 1998 American Chemical Society.