NDLI: Estimating the PDMS-Coated, SPME-Fibre/Water- and Fibre/Gas-Partition Coefficients of Chlorinated Ethenes by Headspace-SPME

Content Provider	Springer Nature Link
Author	Avila, Manuel Alejandro Salaices Breiter, Roman
Copyright Year	2007
Abstract	In this work, a simple, fast and reproducible method is presented for the determination of fibre/liquid-phase and fibre/gas-phase partition coefficients of five chlorinated ethenes on a poly-(dimethylsiloxane), PDMS-coated, solid-phase microextraction fibre, by employing a headspace HS-SPME coupled with gas chromatography. The partition coefficients were estimated by a numerical method using a Level-I fugacity method coupled with parameter-estimation software. Dimensionless partition coefficients between SPME fibre and liquid as well as gas phases were obtained at temperatures of 10 °C, 25 °C and 30 °C. The partition coefficients of the fibre and the gas phase, K fg, increase with decreasing temperature by a factor of ≈2 to 6, and they are directly proportional to the linear slope of the regression line. The same tendency is observed for the partition coefficient of the fibre and liquid phase, K fw, in a factor ≈1.2 to 2.0. The sorption enthalpy is higher in the gas phase; therefore, the sorption onto the fibre is favoured at lower temperatures. The correlation of the log K ow versus log K fw and log K oa versus log K fg shows a linear relationship with the number of chlorine atoms in the C = C molecule. Long-term experiments resulted in sorption to Teflon surfaces and possible losses in 43 mL vials, not observed in 250 mL Boston bottles.
Starting Page	369
Ending Page	376
Page Count	8
File Format	PDF
ISSN	00095893
Journal	Chromatographia
Volume Number	66
Issue Number	5-6
e-ISSN	16121112
Language	English
Publisher	Vieweg Verlag
Publisher Date	2007-08-07
Publisher Place	Wiesbaden
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gas chromatography Solid-phase microextraction Headspace chromatography Partition coefficient Chlorinated ethenes Fugacity Measurement Science, Instrumentation Plant Sciences Biochemistry Pharmacy Organic Chemistry Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Analytical Chemistry Biochemistry Clinical Biochemistry

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