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Microchimica Acta

, Volume 180, Issue 7–8, pp 589–597 | Cite as

Solid phase extraction of Cd(II) and Pb(II) using a magnetic metal-organic framework, and their determination by FAAS

  • Mahmoud Reza SohrabiEmail author
  • Zahra Matbouie
  • Ali Akbar Asgharinezhad
  • Ali Dehghani
Original Paper

Abstract

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 Fe3O4-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−1 for Cd(II), and Pb(II) ions, respectively, relative standard deviations are <4.5% (for five replicates at 50 μg L−1 of Cd(II) and Pb(II) ions), and the enrichment capacity of the MOF is at around 190 mg g−1 for both ions which is higher than the conventional Fe3O4-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.

Figure

Schematic illustration of synthesized magnetic MOF-pyridine nanocomposite

Keywords

Magnetic metal-organic frame work Cd(II) and Pb(II) ions Preconcentration Box-Behnken design Flame atomic absorption spectrometry 

Supplementary material

604_2013_952_MOESM1_ESM.doc (156 kb)
ESM 1 (DOC 155 kb)

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Copyright information

© Springer-Verlag Wien 2013

Authors and Affiliations

  • Mahmoud Reza Sohrabi
    • 1
    Email author
  • Zahra Matbouie
    • 2
  • Ali Akbar Asgharinezhad
    • 3
  • Ali Dehghani
    • 4
  1. 1.Deptartment of ChemistryIslamic Azad UniversityTehranIran
  2. 2.Deptartment of ChemistryIslamic Azad UniversityDarabIran
  3. 3.Department of ChemistryShahid Beheshti UniversityEvinIran
  4. 4.Faculty of ChemistryIran University of Science & Technology (IUST)TehranIran

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