Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
38, Number 7, July 2000, pp. 279-288
Optimization
of Extraction Conditions and Fiber Selection for Semivolatile Analytes Using
Solid-Phase MicroextractionRobert
E. Shirey
Supelco Inc., Supelco Park, Bellefonte, PA 16823
A group of
15 large volatile and semivolatile analytes (MW 92–499 amu) representing
13 organic classes are extracted with 9 different solid-phase microextraction
fibers. The extraction efficiencies of the fibers for each of the analytes are
compared. The influence of modifying the pH of the sample on the extraction
efficiency of the fibers is shown. The effects of the size of the analytes with
respect to fiber coating thickness and the relationship between fiber coating
polarity and analyte polarity are discussed. In addition to fiber polarity and
coating thickness, the different mechanisms by which the fibers extract are
presented. A comparison of immersion and heated headspace extraction techniques
for these analytes is shown.
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