Solid phase extraction of Cd(II) and Pb(II) using a magnetic metal-organic framework, and their determination by FAAS Sohrabi, Mahmoud Reza, E-mail: mr.sohrabi4@gmail.com [Deptartment of Chemistry, Islamic Azad University, North Tehran Branch, P.O. Box 1913674711, Tehran (Iran, Islamic Republic of)]; Matbouie, Zahra [Deptartment of Chemistry, Islamic Azad University, Darab Branch, Darab (Iran, Islamic Republic of)]; Asgharinezhad, Ali Akbar [Department of Chemistry, Shahid Beheshti University, Evin, Tehran (Iran, Islamic Republic of)]; Dehghani, Ali [Faculty of Chemistry, Iran University of Science and Technology (IUST), 16846, Tehran (Iran, Islamic Republic of)] 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; CADMIUM IONS; CONCENTRATION RATIO; COPPER COMPLEXES; EXTRACTION; FERRITES; FLAMES; INFRARED SPECTRA; IRON OXIDES; LEAD IONS; NANOSTRUCTURES; ORGANOMETALLIC COMPOUNDS; PH VALUE; PYRIDINE; SCANNING ELECTRON MICROSCOPY; SEDIMENTS; UPTAKE; X-RAY DIFFRACTION We describe a novel magnetic metal-organic framework (MOF) for the preconcentration of Cd(II) and Pb(II) ions. The MOF was prepared from the Fe{sub 3}O{sub 4}-pyridine conjugate and the copper(II) complex of trimesic acid. The MOF was characterized by IR spectroscopy, elemental analysis, SEM and XRD. A Box-Behnken design through response surface methodology and experimental design was used to identify the optimal parameters for preconcentration. Extraction time, amount of magnetic MOF and pH value were found to be critical factors for uptake, while type, volume, concentration of eluent, and elution time are critical in the elution step. The ions were then determined by FAAS. The limits of detection are 0.2 and 1.1 μg L{sup −1} for Cd(II), and Pb(II) ions, respectively, relative standard deviations are <4.5% (for five replicates at 50 μg L{sup −1} of Cd(II) and Pb(II) ions), and the enrichment capacity of the MOF is at around 190 mg g{sup −1} for both ions which is higher than the conventional Fe{sub 3}O{sub 4}-pyridine material. The magnetic MOF was successfully applied to the rapid extraction of trace quantities of Cd(II) and Pb(II) ions in fish, sediment, and water samples. (author) Austria 2013-06-15 English Journal Article Journal Name: Microchimica Acta (Online); Journal Volume: 180; Journal Issue: 7-8 Medium: X; Size: page(s) 589-597 https://doi.org/10.1007/S00604-013-0952-4 [] 7-8 180 Journal ID: ISSN 1436-5073; TRN: AT1400406102348 INIS 2014-11-26 22280989