Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1072, Issue 1, Pages 7-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.11.027
Keywords
SPME; sol-gel; novel materials; Carbowax 20M
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The preparation and characteristics of solid-phase microextraction (SPME) fibers coated with Carbowax 20M ormosil (organically modified silica) are described here. Raw fused silica fibers were coated with Carbowax 20M-modified silica using sol-gel process. Scanning electron micrographs of fibers revealed a highly porous, sponge-like coating with an average thickness of (8 +/- 1) mu m. The sol-gel Carbowax fibers were compared to commercial fibers coated with 100 mu m polydimethylsiloxane (PDMS) and 65 mu m Carbowax-divinylbenzene (DVB). Shorter equilibrium times were possible with the sol-gel Carbowax fiber: for headspace extraction of the test analytes, they ranged from less than 3 min for benzene to 15 min for o-xylene. Extraction efficiencies of the sol-gel Carbowax fiber were superior to those of conventional fibers: for o-xylene, the extracted masses were 230 and 540% of that obtained with 100 mu m PDMS and 65 mu m Carbowax-DVB fibers, respectively. (c) 2004 Elsevier B.V. All rights reserved.
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