title: Fabrication of polyaniline-coated halloysite nanotubes by in situ chemical polymerization as a solid-phase microextraction coating for the analysis of volatile organic compounds in aqueous solutions.
abstract: We have synthesized an organic-inorganic polyaniline-halloysite nanotube composite by an in situ polymerization method. This nanocomposite is immobilized on a stainless-steel wire and can be used as a fiber coating for solid-phase microextraction. It was found that our new solid-phase microextraction fiber is an excellent adsorbent for the extraction of some volatile organic compounds in aqueous samples in combination with gas chromatography and mass spectrometry. The coating can be prepared easily, is mechanically stable, and exhibits relatively high thermal stability. It is capable of extracting phenolic compounds from water samples. Following thermal desorption, the phenols were quantified by gas chromatography with mass spectrometry. The effects of extraction temperature, extraction time, sample ionic strength, stirring rate, pH, desorption temperature and desorption time were studied. Under optimal conditions, the repeatability for one fiber (n = 5), expressed as the relative standard deviation, is between 6.2 and 9.1%. The detection limits range from 0.005 to 4 ng/mL. The method offers the advantage of being simple to use, with a shorter analysis time, lower cost of equipment and higher thermal stability of the fiber in comparison to conventional methods of analysis.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
authors.forename: Mir Mahdi
authors.initials: MM
authors.lastname: Abolghasemi
authors.affiliation: Polymer Research Laboratory, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
authors.forename: Naser
authors.initials: N
authors.lastname: Arsalani
authors.affiliation: Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
authors.forename: Vahid
authors.initials: V
authors.lastname: Yousefi
authors.affiliation: Polymer Research Laboratory, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
authors.forename: Mahmood
authors.initials: M
authors.lastname: Arsalani
authors.affiliation: Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran.|Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Piryaei
keywords: Gas chromatography; Halloysite nanotubes; Polyaniline; Solid-phase microextraction; Volatile organic compounds