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Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume 40, Number 9, October 2002, pp. 489-494
Coating of Solid-Phase Microextraction Fibers with Chemically
Bonded Silica Particles: Selective Extraction of Polycyclic Aromatic Hydrocarbons
from Drinking Water Samples
R. Rodrigues, C.A. Lacerda, and F.M. Lanças*
University of São Paulo, Institute of Chemistry at São Carlos,
13566-590, São Carlos, SP, Brazil
In this study, solid-phase microextraction fibers coated with
modified silica particles (5 µm dp) bonded to methyl (C1), hexyl (C6),
octyl (C8), and polymeric octadecyl (C18) groups are prepared and evaluated.
Selective extraction of polycyclic aromatic hydrocarbons (PAHs) from river water
is used to demonstrate the selective behavior of the fibers as a function of
the alkyl chains bonded to the silica phase. Scanning electron micrography suggests
that the coating structure consists in a monolayer of particles bonded to the
surface of the fiber. The behavior of the fibers upon the extraction of PAHs
from water samples is compared with the use of standard polydimethylsiloxane
fibers that are commercially available.
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