title: Phenyl-functionalized silica-coated magnetic nanoparticles for the extraction of chlorobenzenes, and their determination by GC-electron capture detection.
abstract: We have prepared a solid phase for the extraction of chlorobenzenes (CBs) by coating magnetic (Fe3 O4 ) nanoparticles with silica via a sol-gel process using a mixture of tetraethoxysilane and triethoxyphenylsilane. The nanoparticles were characterized by SEM, energy-dispersive spectroscopy, and X-ray diffractometry. The nanoparticles were used for the extraction of 1,4-dichlorobenzene (1,4-DCB), 1,2,3-trichlorobenzene (1,2,3-TCB), 1,2,4-trichlorobenzene (1,2,4-TCB), and 1,2,3,4-tetrachlorobenzene (1,2,3,4-TeCB) from water, followed by their determination by GC-electron capture detection. Under optimal conditions, enrichment factors ranging from 220 to 360 were obtained. All determination coefficients (r(2)) are >0.99, and linear response is found in range 0.025-1.5 μg/L (at the lower end), and 6-120 μg/L (at the higher end). Detection limits are 6, 10, 11, and 500 ng/L for 1,2,3,4-TeCB, 1,2,4-TCB, 1,2,3-TCB, and 1,4-DCB, respectively. All RSDs are <6% (for n = 5). The method was successfully applied to the determination of CBs in environmental water samples.
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan, Iran. saraji@cc.iut.ac.ir
authors.forename: Mohammad
authors.initials: M
authors.lastname: Saraji
authors.forename: Nasrin
authors.initials: N
authors.lastname: Khaje
mesh_terms: D002722:Chlorobenzenes / Q000032:analysis* / Q000302:isolation & purification*; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods*; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D002722:Chlorobenzenes; D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide