title: Magnetic Graphene-Dispersive Solid-Phase Extraction for Preconcentration and Determination of Lead and Cadmium in Dairy Products and Water Samples.
abstract: A magnetic-dispersive solid-phase extraction (MDSPE) was used for precocentration of Pb(II) and Cd(II) in milk, yoghurt and water samples. An appropriate amount of suspension containing the magnetic graphene and Triton X-114 was injected rapidly into the aqueous sample by a syringe. Triton X-114 was used to achieve stable suspension of graphene in solution. The structure of the resulting products was confirmed by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD) spectrometry. The effects of various parameters were studied. A detection limit of 0.16 and 0.50 µg L(-1) for Cd(II) and Pb(II) was obtained, respectively. The relative standard deviations (RSDs, n = 10) of 50 µg L(-1) of Pb and Cd were 3.3 % and 2.1 %, respectively. The results indicated that the present method can be reliably used for determination of Pb(II) and Cd(II) in dairy products and water samples with good recoveries.
authors.affiliation: Department of Chemistry, Payame Noor University, P.O. BOX 19395-3697, Tehran, Iran. maryams77@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Ezoddin
authors.affiliation: Education of Kurdistan Province, Saqqez, Iran.
authors.forename: B
authors.initials: B
authors.lastname: Majidi
authors.affiliation: Department of Radiopharmacy and Medicinal Chemistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: K
authors.initials: K
authors.lastname: Abdi
authors.affiliation: Department of Radiopharmacy and Medicinal Chemistry, Tehran University of Medical Sciences, Tehran, Iran.|Drug Design and Development Research Center,, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: N
authors.initials: N
authors.lastname: Lamei
mesh_terms: D002104:Cadmium / Q000032:analysis* / Q000737:chemistry; D003611:Dairy Products; D004784:Environmental Monitoring / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D017830:Octoxynol; D011092:Polyethylene Glycols; D052616:Solid Phase Extraction / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D014867:Water; D011092:Polyethylene Glycols; D006108:Graphite; D017830:Octoxynol; C010615:Nonidet P-40
keywords: Dairy products and water samples; Dispersive solid-phase extraction; Magnetic graphene; Suspension