title: Preparation of a new Cd(II)-imprinted polymer and its application to determination of cadmium(II) via flow-injection-flame atomic absorption spectrometry.
abstract: A new cadmium(II)-imprinted polymer based on cadmium(II) 2,2'-{ethane-1,2-diylbis[nitrilo(E)methylylidene]} diphenolate-4-vinylpyridine complex was obtained via suspension polymerization. The beads were used as a minicolumn packing for flow-injection-flame atomic absorption spectrometry (FI-FAAS) determination of cadmium(II) in water samples. Sorption effectiveness was optimal within pH range of 6.6-7.7. Nitric acid, 0.5% (v/v) was used as eluent. Fast cadmium(II) sorption by the proposed material enabled to apply sample flow rates up to 10mLmin(-1) without loss in sorption effectiveness. Enrichment factor (EF), concentration efficiency (CE) and limit of detection (LOD, 3sigma) found for 120-s sorption time were 117, 39.1min(-1) and 0.11microgL(-1), respectively. Sorbent stability was proved for at least 100 preconcentration cycles (RSD=2.9%). When compared to non-imprinted polymer the new Cd(II)-imprinted polymer exhibited improved selectivity towards cadmium(II) against other heavy metal ions, especially Cu(II) and Pb(II), as well as light metal ions. Accuracy of the method was tested for ground water and waste water certified reference materials and fortified water. The method was applied to Cd(II) determination in natural water samples.
authors.affiliation: Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Krakow, Poland.
authors.forename: Marta
authors.initials: M
authors.lastname: Gawin
authors.forename: Jadwiga
authors.initials: J
authors.lastname: Konefał
authors.forename: Bartosz
authors.initials: B
authors.lastname: Trzewik
authors.forename: Stanisław
authors.initials: S
authors.lastname: Walas
authors.forename: Anna
authors.initials: A
authors.lastname: Tobiasz
authors.forename: Halina
authors.initials: H
authors.lastname: Mrowiec
authors.forename: Ewa
authors.initials: E
authors.lastname: Witek
mesh_terms: D002104:Cadmium / Q000032:analysis* / Q000737:chemistry*; D017022:Flow Injection Analysis; D006863:Hydrogen-Ion Concentration; D054802:Molecular Imprinting; D011108:Polymers / Q000138:chemical synthesis*; D013054:Spectrophotometry, Atomic; D014867:Water / Q000737:chemistry
chemical_list: D011108:Polymers; D002104:Cadmium; D014867:Water