Abstract
Solid-phase microextraction (SPME) was used along with Raman spectroscopy to
quantify the partitioning of trace organics into polydimethylsiloxane (PDMS)
matrices. PDMS has previously been utilized with SPME-Raman to pre-concentrate trace
benzene, toluene, ethyl-benzene, and xylene fuel components from contaminated water,
thereby enhancing detected Raman signals. Here, we show that SPME can increase Raman
signals more than two orders of magnitude for the compounds investigated. We also
demonstrate the quantitative features of SPME-Raman by estimating PDMS-organic
partition coefficients for benzene [log(<i>K</i>) = 1.90 ± 10] and toluene
[log(<i>K</i>) = 2.35 ± 20] by using linear regression fits in the dilute limit
of concentrations. The <i>K</i> values obtained are within the range of values
obtained with other quantitative SPME techniques. The method was also used to
characterize quinoline, a pyridine-based organic, which yielded reasonable <i>K</i>
values [log(<i>K</i>) = 1.20 ± 20]. Combining PDMS-based SPME with a technique such
as Raman spectroscopy potentially enhances optical detection methods used in
microfluidic systems, wherein PDMS is a common material of construction.
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