Preparation and Characterization of Porous Silica-Coated Multifibers for Solid-Phase Microextraction

C18-bonded silica-coated multifibers were prepared and studied as a stationary phase for solid-phase microextraction (SPME). The porous multifiber SPME provided larger absorption capacity and higher absorption rate compared to a polymer-coated single fiber. Its absorption rate was 10 times higher th...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2001-05, Vol.73 (9), p.2041-2047
Main Authors: Xia, Xin-Rui, Leidy, Ross B
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Chemistry
Chromatographic methods and physical methods associated with chromatography
Chromatography, Gas
Exact sciences and technology
Filtration - methods
Gas chromatographic methods
Gas Chromatography-Mass Spectrometry - instrumentation
Gas Chromatography-Mass Spectrometry - methods
Global environmental pollution
Hydrocarbons, Chlorinated
Insecticides - analysis
Microscopy, Electron, Scanning
Pesticide Residues - analysis
Pollution
Silicon
Silicon Dioxide - chemistry
Water - analysis
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Summary:C18-bonded silica-coated multifibers were prepared and studied as a stationary phase for solid-phase microextraction (SPME). The porous multifiber SPME provided larger absorption capacity and higher absorption rate compared to a polymer-coated single fiber. Its absorption rate was 10 times higher than that of a commercial 100-μm poly(dimethylsiloxane) (PDMS)-coated fiber. Its high extraction efficiency enabled the positive identification of unknown compounds at sub-part-per-billion level in full-scan mode with a benchtop quadruple GC/MS. The desorption temperature indicated that the analyte interactions with the C18-bonded silica were stronger than those with the PDMS polymer. The dependence of the equilibration time on the molecular weight was not observed for the porous multifiber SPME. The boundary layer between the fiber coating and the sample matrix could be the absorption control step in SPME under mild agitation. The special experimental conditions in the porous multifiber SPME, such as air interference and polar organic solvent wetting, were investigated.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac001273f