title: Nanoscale-supported heteropoly acid as a new fiber coating for solid-phase microextraction coupled with gas chromatography-mass spectrometry.
abstract: In the present study, 12-tungstophosphoric (PW) acid as heteropoly acid, supported on silica-coated γ-Fe2O3 nanoparticles (NPs), was used as a new fiber coating for solid-phase microextraction (SPME). The γ-Fe2O3@SiO2-PW nanocomposite with high surface area was synthesized and characterized by SEM and FT-IR. The prepared nanocomposite was immobilized on a stainless steel wire for fabrication of the SPME fiber. The fiber was evaluated for the extraction of some phenolic compounds (PCs) from water sample in combination with gas chromatography-mass spectrometry (GC-MS). A one-at-a-time optimization strategy was applied for optimizing the important extraction parameters such as extraction temperature, extraction time, ionic strength, stirring rate, pH, and desorption temperature and time. In optimum conditions, the repeatability for one fiber (n=3), expressed as relative standard deviation (R.S.D. %), was between 4.8% and 9.6% for the test compounds. The detection limits for the studied compounds were between 0.004 and 0.05 pg mL(-1). The developed method offers the advantage of being simple to use, with shorter analysis time, lower cost of equipment, thermal stability of fiber and high relative recovery in comparison to conventional methods of analysis.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran. Electronic address: mehdiabolghasemi@gmail.com.
authors.forename: Mir Mahdi
authors.initials: MM
authors.lastname: Abolghasemi
authors.affiliation: Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
authors.forename: Sona
authors.initials: S
authors.lastname: Hassani
authors.affiliation: Faculty of Chemistry, Razi University, Kermanshah, Iran.
authors.forename: Ezzat
authors.initials: E
authors.lastname: Rafiee
authors.affiliation: Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
authors.forename: Vahid
authors.initials: V
authors.lastname: Yousefi
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D053761:Nanocomposites / Q000737:chemistry*; D009994:Osmolar Concentration; D010636:Phenols / Q000032:analysis; D010756:Phosphoric Acids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D017973:Tungsten Compounds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: C519880:12-tungstophosphoric acid; D005290:Ferric Compounds; D010636:Phenols; D010756:Phosphoric Acids; D017973:Tungsten Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D012822:Silicon Dioxide
keywords: Gas chromatography-mass spectrometry; Heteropoly acid; Phenolic compounds; Polyoxometalate; Solid-phase microextraction; γ-Fe(2)O(3) nanoparticles