title: Magnetic microsphere-confined graphene for the extraction of polycyclic aromatic hydrocarbons from environmental water samples coupled with high performance liquid chromatography-fluorescence analysis.
abstract: In this paper, a magnetic microsphere-confined graphene adsorbent (Fe3O4@SiO2-G) was fabricated and used for the extraction of five polycyclic aromatic hydrocarbons (fluorene, anthracene, phenanthrene, fluoranthene and pyrene) from environmental water samples prior to high performance liquid chromatography with fluorescence detection. The Fe3O4@SiO2-G was characterized by various instrumental methods. Various experimental parameters that could affect the extraction efficiencies, such as the amount of Fe3O4@SiO2-G, the pH and ionic strength of sample solution, the extraction time and the desorption conditions, were investigated. Due to the high surface area and excellent adsorption capacity of the Fe3O4@SiO2-G, satisfactory extraction can be achieved with only 15mg of the adsorbent per 250mL solution and 5min extraction. Under the optimum conditions, a linear response was observed in the concentration range of 5-1500ngL(-1) for fluorene, 2.5-1500ngL(-1) for anthracene and 15-1500ngL(-1) for phenanthrene, fluoranthene and pyrene, with the correlation coefficients (r) ranging from 0.9897 to 0.9961. The limits of detection (S/N=3) of the method were between 0.5 and 5.0ngL(-1). The relative standard deviations (RSDs) were less than 5.6%. The recoveries of the method were in the range between 83.2% and 108.2%. The results indicated that this graphene-based magnetic nanocomposite had a great adsorptive ability toward the five polycyclic aromatic hydrocarbons from environmental water samples.
authors: Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding 071001, China.
authors: Weina
authors: W
authors: Wang
authors: Ruiyang
authors: R
authors: Ma
authors: Qiuhua
authors: Q
authors: Wu
authors: Chun
authors: C
authors: Wang
authors: Zhi
authors: Z
authors: Wang
mesh_terms: D000096:Acetone / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D017743:Equipment Reuse; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D016014:Linear Models; D008863:Microspheres; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012623:Seawater / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D014881:Water Supply / Q000032:analysis
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D000096:Acetone; D012965:Sodium Chloride; D012822:Silicon Dioxide; D006108:Graphite; D052203:Ferrosoferric Oxide