Determination of water pollutants by direct-immersion solid-phase microextraction using polymeric ionic liquid coatings

The determination of a group of eighteen pollutants in waters, Including polycyclic aromatic hydrocarbons and substituted phenols. is conducted in direct-immersion solid-phase microextration (SPME) using the polymeric ionic liquid (PIL) poly(1-vinyl-3-hexadecylIIllIcIazolILIm) bIs[(trifluoromethyl)sulfonyl]imide as a novel coating material The performance of the I'll. fiber coating in the developed IL-SPME-gas chromatography (GC)-mass spectrometry (MS) method is characterized by average relative recoveries of 92 5% for deionized waters and 90 8% for well waters, average precision values (as relative standard deviations. RSD%) of 11% for deionized waters and 12% for well waters. using a spiked level of S ng mL(-1) The detection limits oscillate front 0005 ng mL(-1) for fit10ranthene to 4 4 rig mL(-1) for 4-chloro-3-methylphenol, when using all extraction tinge of 60 min with 20mL of aqueous sample The extraction capabilities of the PIL fiber have been compared with rile commercial SPME coatings polydimethylsyloxane (PDMS) 30 mu m, PDMS 100 mu m and polyacrylate (PA) 85 mu m The PIL fiber is superior to tile PDMS 30 mu m for all analytes studied A qualitative study was also carried out to compare among the nature of tile coating materials by normalizing the coating thickness The PIL material was shown to be more efficient than the PDMS material for all analytes studied The PIL coating was also adequate for nonpolar analytes whereas the PA material was more sensitive for polar compounds (C) 2009 Elsevier B V All rights reserved