Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1056, Issue 1-2, Pages 13-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.05.047
Keywords
sol-gel technology; solid-phase microextraction; polydimethylsiloxane; poly(vinyl alcohol); polychlorinated biphenyls
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The applicability of a composite composed of polydimethylsiloxane (PDMS) and poly(vinyl alcohol) (PDMS/PVA) as coating sorbent for SPME fibers is demonstrated here. Fused silica (FS) fibers were coated with PDMS/PVA composite through a sol-gel process, using methyltrimethoxysilane as reticulating agent. The chemical and physical properties of the sol-gel PDMS/PVA composite were determined by infrared spectroscopy and thermogravimetric analysis. Electron scanning microscopy of the prepared fibers, showed that the coating obtained was highly microporous, having a thickness of approximately 5 mum. The fibers were tested for the headspace extraction of several organic compounds (o-xylene, naphthalene, ethyl caprate, p-chlorotoluene and PCB) prior to gas chromatographic analysis. The extractive capacity of the PDMS/PVA coating was found to be superior to that of pure conventional PDMS fibers. (C) 2004 Elsevier B.V. All rights reserved.
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