An ion imprinted polymer (IIP) was synthesized by using Pb(II) as a template, methacrylic acid as a monomer, 8-hydoxyquinoline as a ligand, ethylene glycol dimethacrylate (EGDMA) as a crosslinker, and azobisisobutyronitrile as initiator. It can be applied to prepare lead ion selective voltammetric sensor for Pb(II) adsorption and trace detection. The Pb(II)-IIP was characterized by FTIR spectra and SEM image. Under optimized conditions of polymerization, the Pb(II)-IIP showed good adsorption behavior toward Pb(II), with a magnitude of three times higher than that of the non imprinted polymer (NIP). Also, it exhibited a favorable selectivity for Pb(II), compared with other heavy metal ions of Hg(II), Cd(II), Cu(II), and a negligible adsorption to the other cations. The synthesized IIP was used to determine trace levels of Pb(II) in food and water samples, with a calibration linear range over Pb(II) concentrations of 0.05 -60 μM and a limit of detection at 0.01 μM.

A novel Hg(II) ion imprinted polymer (IIP) was synthesized by bulk polymerization using the Hg(II) ion as a template, 4-vinylpyridine (4-VP) as a monomer, 8-hydroxyquinoline as a specific ligand for Hg(II), and ethylene glycol dimethacrylate (EDMA) as a crosslinker. The Hg(II) IIP was systematically characterized by adsorption tests, FTIR spectroscopy, pore size analysis and SEM studies. Under the optimized condition, the maximum adsorption of Hg(II) IIP was 143.8 mg g À1 , nearly three times higher than that of the non ion-imprinted polymer (NIP) (52.6 mg g À1 ). The synthesized Hg(II) IIP had a good selectivity for the Hg(II) ion compared with other ions. The trace amounts of Hg(II) in tap water and river water samples were measured by the sequential injection-vapor generation-atomic fluorescence spectrometry (SI-VG-AFS) in a linear range of 0.01-1 mg L À1 , with the limit of detection (LOD) of 0.005 mg L À1 .