Abstract
A poly(pyrrole-co-phenol) film synthesized by the constant potential coulometry technique was coated on stir-bar for sorptive extraction. The extraction properties of this stir-bar were evaluated for the extraction of polycyclic aromatic hydrocarbons (PAHs), followed by liquid chromatography analysis. The copolymer coatings of polypyrrole/polyphenol doped with dodecylbenzenesulfonate and oxalate were synthesized in aqueous solution. The scanning electron micrographs, energy-dispersive X-ray spectroscopy, and FTIR spectra for the coated stir-bar are presented. The effects of potential, time, and solution concentration (pyrrole, phenol, sodium dodecylbenzenesulfonate, and oxalic acid) were evaluated in the coating step. The effects of extraction time, extraction temperature, and ionic strength in the sorption step, and the effects of type and volume of desorption solvent, desorption time, and desorption temperature in the desorption step were studied. The detection limits obtained for the various compounds studied varied between 0.02 and 0.12 ng mL−1, the intra-day (N = 7) relative standard deviations at 8 ng mL−1 concentration level using a single stir-bar were 2.4–12%, respectively. The bar-to-bar reproducibilities, also at 8 ng mL−1, were 3.4–13%. The linear ranges and recoveries varied from 0.1 to 400 ng mL−1, and 69% to 113%, respectively. The method was successfully applied for the determination of a group of PAHs in real samples.
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