title: Magnetized graphene layers synthesized on the carbon nanofibers as novel adsorbent for the extraction of polycyclic aromatic hydrocarbons from environmental water samples.
abstract: The application of magnetized graphene (G) layers synthesized on the carbon nanofibers (CNFs) (m-G/CNF) was investigated as novel adsorbent for the magnetic solid-phase extraction (MSPE) of polycyclic aromatic hydrocarbons (PAHs) in water samples followed by gas chromatography-flame ionization detector (GC-FID). Six important parameters, affecting the extraction efficiency of PAHs, including: amount of adsorbent, adsorption and desorption times, type and volume of the eluent solvent and salt content of the sample were evaluated. The optimum extraction conditions were obtained as: 5min for extraction time, 20mg for sorbent amount, dichloromethane as desorption solvent, 1mL for desorption solvent volume, 5min for desorption time and 15% (w/v) for NaCl concentration. Good performance data were obtained at the optimized conditions. The calibration curves were linear over the concentration ranges from 0.012 to 100ngmL(-1) with correlation coefficients (r) between 0.9950 and 0.9967 for all the analytes. The limits of detection (LODs, S/N=3) of the proposed method for the studied PAHs were 0.004-0.03ngmL(-1). The relative standard deviations (RSDs) for five replicates at two concentration levels (0.1 and 50ngmL(-1)) of PAHs were ranged from 3.4 to 5.7%. Appropriate relative recovery values, in the range of 95.5-99.9%, were also obtained for the real water sample analysis.
authors: Department of Chemistry, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, Iran.
authors: Mostafa
authors: M
authors: Rezvani-Eivari
authors: Department of Chemistry, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, Iran. Electronic address: Amiri_amirhassan@yahoo.com.
authors: Amirhassan
authors: A
authors: Amiri
authors: Department of Chemistry, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, Iran.
authors: Mehdi
authors: M
authors: Baghayeri
authors: Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
authors: Ferial
authors: F
authors: Ghaemi
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002849:Chromatography, Gas; D004784:Environmental Monitoring / Q000379:methods*; D005410:Flame Ionization; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D008280:Magnetics; D057139:Nanofibers / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000295:instrumentation*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D002244:Carbon; D006108:Graphite
keywords: Carbon nanofiber; Gas chromatography–flame ionization detector; Graphene; Magnetic solid-phase extraction; Polycyclic aromatic hydrocarbons