title: Synthesis and application of a nanoporous ion-imprinted polymer for the separation and preconcentration of trace amounts of vanadium from food samples before determination by electrothermal atomic absorption spectrometry.
abstract: A vanadium ion-imprinted polymer was synthesized in the presence of V(V) and N-benzoyl-N-phenyl hydroxyl amine using 4-vinyl pyridine as the monomer, ethylene glycol dimethacrylate as the cross linker and 2,2'-azobis(isobutyronitrile) as the initiator. The imprinted V(V) ions were completely removed by leaching the polymer with 5 mol/L nitric acid, and the polymer structure was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The ion-imprinted polymer was used as the sorbent in the development of the solid-phase extraction method for V(V) prior to its determination by electrothermal atomic absorption spectrometry. The maximum sorption capacity for V(V) ions was 26.7 mg/g at pH 4.0. Under the optimum conditions, for a sample volume of 150.0 mL, an enrichment factor of 289.0 and a detection limit of 6.4 ng/L were obtained. The developed method was successfully applied to the determination of vanadium in parsley, zucchini, black tea, rice, and water samples.
authors.affiliation: Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
authors.forename: Shayessteh
authors.initials: S
authors.lastname: Dadfarnia
authors.affiliation: Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Haji Shabani
authors.affiliation: Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran.
authors.forename: Shahab
authors.initials: S
authors.lastname: Dehghanpoor Frashah
mesh_terms: D005506:Food Contamination / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D016062:Porosity; D013054:Spectrophotometry, Atomic; D013499:Surface Properties; D013696:Temperature; D014639:Vanadium / Q000032:analysis*
chemical_list: D007477:Ions; D011108:Polymers; D014639:Vanadium
keywords: Electrothermal atomic absorption spectrometry; Food samples; Ion-imprinted polymer; Solid-phase extraction; Vanadium