Headspace solid-phase microextraction using an electrochemically deposited dodecylsulfate-doped polypyrrole film to determine of phenolic compounds in water

A dodecylsulfate-doped polypyrrole (PPy-DS) film was prepared by electrochemical fiber coating (EFC) technique and applied as a new fiber for headspace solid-phase microextraction (HS-SPME) of phenolic compounds from water samples. Electrochemically polymerized PPy is formed on the surface of a platinum wire and will contain charge-compensating anion (dodecylsulfate) incorporated during synthesis. The efficiency of this fiber for microextraction of phenols was evaluated using a HS-SPME device coupled with gas chromatography-flame ionization detection (GC-FID). The results shows that PPy-DS as a SPME fiber coating is suitable for the successful extraction of phenolic compounds. Parameters like ionic strength, agitation of the sample, sample pH, temperature of the sample, and adsorption/desorption times were studied and optimized to obtain the best extraction results. This method provided good repeatability (R.S.D.s < 7.2%) for spiked water samples. The calibration graphs were linear in the range of 2-100 ng mL(-1) with the square of the correlation coefficient R-2 > 0.991 and detection limits were between 0.57 and 1.82 ng mL(-1). The capability of PPy-DS to extract phenolic compounds has been compared with the results obtained with literature data for several fibers and this laboratory-made fiber showed comparable analytical parameter for the studied compounds. (c) 2007 Elsevier B.V All rights reserved.