Polypyrrolegraphene compositecoated fiber for the solidphase microetraction of phenols分析和总结分析和总结.docxVIP

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Polypyrrolegraphene compositecoated fiber for the solidphase microetraction of phenols分析和总结分析和总结.docx

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Polypyrrole/graphene composite-coated fiber for the solid-phase microextraction of phenols Jing Zou1, Xinhong Song1, Jiaojiao Ji1, Weici Xu1, Jinmei Chen1, Yaqi Jiang1, Yiru Wang1, Xi Chen1,2,* Article first published online: 8 AUG 2011 DOI: 10.1002/jssc.201100303 Copyright ? 2011 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim Issue Journal of Separation Science Volume 34, Issue 19, pages 2765–2772, October 2011 Keywords: GC; Graphene; Phenols; Polypyrrole; Solid-phase microextraction Abstract A polypyrrole (Ppy)/graphene (G) composite was developed and applied as a novel coating for use in solid-phase microextraction (SPME) coupled with gas chromatography (GC). The Ppy/G-coated fiber was prepared by electrochemically polymerizing pyrrole and G on a stainless-steel wire. The extraction efficiency of Ppy/G-coated fiber for five phenols was the highest compared with the fibers coated with either Ppy or Ppy/graphene oxide (GO) using the same method preparation. Significantly, compared with various commercial fibers, the extraction efficiency of Ppy/G-coated fiber is better than or comparable to 85 μm CAR/PDMS fiber (best extraction efficiency of phenol, o-cresol, and m-cresol in commercial fibers) and 85 μm polyacrylate (PA) fiber (best extraction efficiency of 2,4 -dichlorophenol and p-bromophenol in commercial fibers). The effects of extraction and desorption parameters such as extraction time, stirring rate, and desorption temperature and time on the extraction/desorption efficiency were investigated and optimized. The calibration curves were linear from 10 to 1000 μg/L for o-cresol, m-cresol, p-bromophenol, and 2,4-dichlorophenol, and from 50 to 1000 μg/L for phenol. The detection limits were within the range 0.34–3.4 μg/L. The single fiber and fiber-to-fiber reproducibilities were 8.3 (n=7) and 13.3% (n=4), respectively. The recovery of the phenols spiked in natural water samples at 200 μg/L ranged from 74.1 to 103.9% and the relative standard deviat