title: Study on column SPE with synthesized graphene oxide and FAAS for determination of trace amount of Co(II) and Ni(II) ions in real samples.
abstract: A selective method for the preconcentration and separation of trace amounts of Co(II) and Ni(II) by column solid phase extraction has been developed. The method is based on the adsorption of metal ions as N-(5-methyl-2-hydroxyacetophenone)-N'-(2-hydroxyacetophenone) ethylene diamine (MHE) complex on synthesized graphene oxide. Computational modeling based on PM6 semi-empirical potential energy surface was utilized to investigate the interaction of metallic complexes with graphene oxide sheet. The adsorption was achieved quantitatively on graphene oxide at pH6.0 and then the retained analyte contents on the column were quantitatively eluted with 3.0 mol L(-1) HNO3. Experimental conditions for effective separation of trace levels of the analyte ions such as pH, flow rate, concentration of eluent, sample volume and interference ions were investigated. A preconcentration factor of 250 was achieved by passing 1250 mL of sample through the solid phase, while the limit of detection of Co(II) and Ni(II) ions were found to be 0.25 and 0.18 ng mL(-1), respectively. The method was applied to the determination of analyte ions in water, black tea and tomato samples.
authors.affiliation: NFCRS, Nuclear Science & Technology Research Institute, P.O. Box 11365-8486, Tehran, Iran. Electronic address: pourjavid@gmail.com.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Pourjavid
authors.affiliation: NFCRS, Nuclear Science & Technology Research Institute, P.O. Box 11365-8486, Tehran, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Arabieh
authors.affiliation: NFCRS, Nuclear Science & Technology Research Institute, P.O. Box 11365-8486, Tehran, Iran.
authors.forename: Seyed Reza
authors.initials: SR
authors.lastname: Yousefi
authors.affiliation: Department of Chemistry, Payame Noor University, Tehran, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Jamali
authors.affiliation: NFCRS, Nuclear Science & Technology Research Institute, P.O. Box 11365-8486, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Rezaee
authors.affiliation: NFCRS, Nuclear Science & Technology Research Institute, P.O. Box 11365-8486, Tehran, Iran.
authors.forename: Majid Haji
authors.initials: MH
authors.lastname: Hosseini
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
authors.forename: Ali Akbari
authors.initials: AA
authors.lastname: Sehat
mesh_terms: D003035:Cobalt / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D009532:Nickel / Q000032:analysis*; D010087:Oxides / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*
chemical_list: D010087:Oxides; D003035:Cobalt; D006108:Graphite; D009532:Nickel
keywords: Cobalt; Flame atomic absorptions spectrometry; Graphene oxide; Nickel; Solid phase extraction