title: Ionic-liquid-mediated poly(dimethylsiloxane)- grafted carbon nanotube fiber prepared by the sol-gel technique for the head space solid-phase microextraction of methyl tert-butyl ether using GC.
abstract: A headspace solid-phase microextraction method was developed for the preconcentration and extraction of methyl tert-butyl ether. An ionic-liquid-mediated multiwalled carbon nanotube-poly(dimethylsiloxane) hybrid coating, which was prepared by covalent functionalization of multiwalled carbon nanotubes with hydroxyl-terminated poly(dimethylsiloxane) using the sol-gel technique, was used as solid-phase microextraction adsorbent. This innovative fiber exhibited a highly porous surface structure, high thermal stability (at least 320°C) and long lifespan (over 210 uses). Potential factors affecting the extraction efficiency were optimized. Under the optimum conditions, the method LOD (S/N = 3) was 0.007 ng/mL and the LOQ (S/N = 10) was 0.03 ng/mL. The calibration curve was linear in the range of 0.03-200 ng/mL. The RSDs for one fiber (repeatability, n = 5) at three different concentrations (0.05, 1, and 150 ng/mL) were 5.1, 4.2, and 4.6% and for the fibers obtained from different batches (reproducibility, n = 3) were 6.5, 5.9, and 6.3%, respectively. The developed method was successfully applied to the determination of methyl tert-butyl ether in different real water samples on three consecutive days. The relative recoveries for the spiked samples with 0.05, 1, and 150 ng/mL were between 94-104%.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Vatani
authors.forename: Ali Sarafraz
authors.initials: AS
authors.lastname: Yazdi
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D008738:Methyl Ethers / Q000032:analysis* / Q000302:isolation & purification*; D043942:Nanotubes / Q000737:chemistry; D044367:Phase Transition; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000302:isolation & purification*
chemical_list: D004129:Dimethylpolysiloxanes; D052578:Ionic Liquids; D008738:Methyl Ethers; D014874:Water Pollutants, Chemical; C043243:methyl tert-butyl ether; C013830:baysilon
keywords: Carbon nanotubes; Ionic liquids; Methyl tert-butyl ether; Sol-gel technique; Solid-phase microextraction