Preconcentration of Fe III Using Fe III -Ion Imprinted Polymeric Traps and Its Analytical Performance for FAAS

Authors : Muharrem KARABÖRK, Arzu ERSÖZ, Ebru BİRLİK, Rıdvan SAY

Pages : 135-142

View : 17 | Download : 6

Publication Date : 2007-04-01

Article Type : Research Paper

Abstract :Novel Fe III -imprinted beads were prepared by molecular imprinting technique for selective solid-phase extraction SPE of Fe III ions prior to its determination by flame atomic absorption spectrometry FAAS . The functional metalcomplexing monomer and crosslinking monomer used were methacrylamidoantipyrine MAAP and ethyleneglycoldimethacrylate EGDMA , respectively. MAAP was synthesized using methacryloylchloride, 4-aminoantipyrine andpyridine. Fe III ions were complexed with MAAP and the Fe III -imprinted poly MAAP-EGDMA beads were synthesized by suspension polymerization. After that, the template ions i.e., Fe III ions were removed using 4.0 M HNO3solution. The specific surface area of the Fe III -imprinted and non-imprinted poly MAAP-EGDMA beads was foundto be 1181.45 m2/g and 437.94 m2/g, respectively. The swelling ratio was 60% and 47% for imprinted and non-imprintedbeads, respectively. According to the elemental analysis results, the beads contained 119.0 µmol MAAP/g polymer.The maximum adsorption capacity, optimum pH and equilibrium binding time were 29.32 mg/g, 4.0 and 80 min, respectively. Selectivity coefficients for Al III , Cu II , Zn II and Co II ions were compared with Fe III ion. Fe III -imprinted beads showed the following order of metal ion affinity: Fe III >Zn II >Cu II >Co II >Al III . The Fe III -imprintedpoly MAAP-EGDMA beads could be used many times without decreasing their adsorption capacities significantly
Keywords : Ion imprinting IIP, FAAS, Fe III ion, Preconcentration, solid phase extraction