title: Ionic liquid coated magnetic core/shell Fe3O4@SiO2 nanoparticles for the separation/analysis of linuron in food samples.
abstract: Three hydrophobic ionic liquids (ILs) including 1-butyl-3-methylimidazole hexafluorophosphate ([BMIM]PF6), 1-hexyl-3-methyl-imidazole hexafluorophosphate ([HMIM]PF6), and 1-octyl-3-methylimidazole hexafluoro-phosphate ([OMIM]PF6) coated Fe3O4@SiO2 nanoparticles with core-shell structure to prepare magnetic solid phase extraction agent (Fe3O4@SiO2@ILs) and establish a new method of magnetic solid phase extraction (MSPE) coupled with UV spectrometry for separation/analysis of linuron. The results showed that linuron was adsorbed rapidly by Fe3O4@SiO2@[OMIM]PF6 and eluanted by ethanol. Under the optimal conditions, preconcentration factor of the proposed method was 10-fold. The linear range, detection limit, correlation coefficient (R) and relative standard deviation (RSD) were found to be 0.04-20.00 μg mL(-1), 5.0 ng mL(-1), 0.9993 and 2.8% (n=3, c=4.00 μg mL(-1)), respectively. The Fe3O4@SiO2 nanoparticles could be used repeatedly for 10 times. This proposed method has been successfully applied to the determination of linuron in food samples.
authors.affiliation: College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China.
authors.forename: Jieping
authors.initials: J
authors.lastname: Chen
authors.affiliation: College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China. Electronic address: xszhu@yzu.edu.cn.
authors.forename: Xiashi
authors.initials: X
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D052203:Ferrosoferric Oxide / Q000737:chemistry; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D005638:Fruit / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D008044:Linuron / Q000032:analysis*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D009994:Osmolar Concentration; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013818:Thermogravimetry; D014675:Vegetables / Q000737:chemistry
chemical_list: C412621:1-butyl-3-methylimidazolium hexafluorophosphate; C446740:1-octyl-3-methylimidazolium hexafluorophosphate; D007093:Imidazoles; D052578:Ionic Liquids; D058185:Magnetite Nanoparticles; D008044:Linuron; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide
keywords: Ionic liquid loaded magnetic nanoparticles; Linuron; Magnetic solid phase extraction; UV spectrometry