Produção Nacional
Revisado por pares
Preparation and characterization of polydimethylsiloxane/poly(vinylalcohol) coated solid phase microextraction fibers using sol–gel technology
2004; Elsevier BV; Volume: 1056; Issue: 1-2 Linguagem: Inglês
10.1016/j.chroma.2004.05.047
ISSN1873-3778
AutoresAlexandre Lopes, Fábio Augusto,
Tópico(s)Analytical Chemistry and Sensors
ResumoThe 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 μm. 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.
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