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Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume 45,
Number 1, January 2007, pp.33-37
Polydimethylsiloxane as a Packing Material in a
Programmed Temperature Vaporizer to Introduce Large-Volume Samples
in Capillary Gas Chromatography
Gema Flores, Marta Herraiz, Gracia Patricia Blanch,
and Maria Luisa Ruiz del Castillo
Instituto de Fermentaciones Industriales, Consejo Superior de
Investigaciones Científicas (CSIC), Juan de la Cierva 3,
28006 Madrid, Spain
The viability of using polydimethylsiloxane (PDMS)
as a retaining material inside a programmed temperature vaporizer
injector for the introduction of large-volume samples in gas chromatography
is assessed. To that end, materials made up of Volaspher A-2 and
coated with different percentages of PDMS (5%, 15%, and 50%) are
considered. In addition, adsorbent (Tenax TA) and absorbent (PDMS)
materials are comparatively studied in terms of their retention
capacity. A relative standard deviation lower than 5.0% is obtained
from the injection of PDMS, whereas values up to 49% are provided
by Tenax TA. Significantly higher amounts of different volatile
compounds are retained by PDMS in comparison with Tenax TA. In
conclusion, the use of PDMS as a packing material seems to be
viable for large-volume sampling and particularly recommendable
for minor compounds occurring in complex matrices.
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