Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
39, Number 12, December 2001, pp. 521-529
Potential of Solid-Phase Microextraction Fibers for the Analysis
of Volatile Organic Compounds in Air
Ludovic Tuduri, Valérie
Desauziers, and Jean Louis Fanlo
Laboratoire Génie de l’Environnement Industriel, École des
Mines d’Alès, 6 Avenue de Clavières, 30319 Alès cedex,
France
This work presents the usefulness of five different solid-phase
microextraction fibers in the screening of volatile organic compound (VOC) traces
in air samples. The performances of these fibers are compared by studying the
sorption kinetics in an equimolar gaseous mixture of eleven VOCs. For each fiber,
static and dynamic sampling are compared. It is shown that repeatability is
better for the dynamic mode (less than 6% for dynamic sampling and 10% for static
sampling). The equilibrium time and the sensitivity vary considerably from one
fiber type to another. As an example, the classical polydimethylsiloxane (PDMS)
coating presented the shortest equilibration time (5 min) but also the poorest
sensitivity, whereas the PDMS–Carboxen showed the longest extraction time
but the greatest sensitivity. The estimation of the quantity of VOCs fixed on
the target fiber allows for the determination of the different affinities of
the compounds with the involved sorbent and relates them with physicochemical
properties of the molecules. Competitive sorption is observed for the fibers
involved with the adsorption process (i.e., PDMS–divinylbenzene and PDMS–Carboxen
fibers). These competitions can lead to SPME calibration problems and thus bad
quantitative analysis.
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