On‐line determination of organochlorine pesticides in water by solid‐phase microextraction and gas chromatography with electron capture detection

Abstract This paper describes the extraction of 20 organochlorine pesticides (OCPs) from water samples using solid‐phase microextraction (SPME). Three fused‐silica fibers coated or bonded with polydimethylsiloxane (PDMS) of different film thicknesses (20‐, 30‐, and 100‐μm) were evaluated. The extraction time, the effects of stirring and addition of NaCl to the aqueous sample, the linear range and the precision of this technique, and the effect of carryover were examined for 20 analytes and are presented here. A comparison with results using conventional liquid‐liquid extraction demonstrate that the SPME technique is well suited as a fast screening technique for OCPs in water samples.