title: Preparation of new ion-selective cross-linked poly(vinylimidazole-co-ethylene glycol dimethacrylate) using a double-imprinting process for the preconcentration of Pb²⁺ ions.
abstract: A new ion-selective cross-linked poly(vinylimidazole-co-ethylene glycol dimethacrylate) prepared via a double-imprinting process was developed for the recognition and preconcentration of Pb(2+) from water samples. The sorbent was characterized by FT-IR, SEM, TGA and textural data. The maximum dynamic sorption capacity of Pb(2+) was 42.04 mg Pb(2+) g(-1) of the double-imprinted polymer. The sorption kinetics data were described by a pseudo-second-order model. The double-imprinted polymer exhibited a higher sorption efficiency of Pb(2+) than the blank polymer (non-imprinted polymer). The preconcentration procedure involved the loading of a Pb(2+) solution at pH 7.25 through 40.0 mg of the double-imprinted polymer packed in a mini-column at 5.0 mL min(-1). The selective efficiency of proposed method for the Pb(2+) preconcentration was assured by competitive sorption using different proportions of Pb(2+)/cations and Pb(2+)/anions. An analytical curve was obtained in the range 0.0-300.0 μg L(-1) (r=0.999) and a limit of detection of 2.46 μg L(-1) was obtained. The preconcentration factor was found to be 21, the consumptive index 0.95 mL and the concentration efficiency 5.25 min(-1). The preconcentration method was successfully applied to the Pb(2+) ions determination in different kinds of water samples with high recovery values (91.3-108.9%).
authors.affiliation: Universidade Estadual de Londrina (UEL), Departamento de Química, Centro de Ciências Exatas, Rodovia Celso Garcia Cid, PR 445, km 380, Londrina, PR 86050-482, Brazil; Instituto Nacional de Ciência e Tecnologia (INCT) de Bioanalítica, Universidade Estadual de Campinas (UNICAMP), Instituto de Química, Departamento de Química Analítica, Cidade Universitária Zeferino Vaz, s/n, Campinas, SP 13083-970, Brazil. Electronic address: ctarleyquim@yahoo.com.br.
authors.forename: César Ricardo Teixeira
authors.initials: CRT
authors.lastname: Tarley
authors.affiliation: Universidade Estadual de Londrina (UEL), Departamento de Química, Centro de Ciências Exatas, Rodovia Celso Garcia Cid, PR 445, km 380, Londrina, PR 86050-482, Brazil.
authors.forename: Marcela Zanetti
authors.initials: MZ
authors.lastname: Corazza
authors.affiliation: Universidade Estadual de Londrina (UEL), Departamento de Química, Centro de Ciências Exatas, Rodovia Celso Garcia Cid, PR 445, km 380, Londrina, PR 86050-482, Brazil.
authors.forename: Bruna Fabrin
authors.initials: BF
authors.lastname: Somera
authors.affiliation: Universidade Estadual de Londrina (UEL), Departamento de Química, Centro de Ciências Exatas, Rodovia Celso Garcia Cid, PR 445, km 380, Londrina, PR 86050-482, Brazil.
authors.forename: Mariana Gava
authors.initials: MG
authors.lastname: Segatelli
mesh_terms: D007093:Imidazoles / Q000138:chemical synthesis / Q000737:chemistry*; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry*; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000138:chemical synthesis / Q000737:chemistry*; D011145:Polyvinyls / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D008689:Methacrylates; D011145:Polyvinyls; C421283:poly(ethylene glycol)-dimethacrylate; C072974:polyvinylimidazole; D007854:Lead; D011092:Polyethylene Glycols
keywords: FAAS; Hierarchically imprinted organic polymer; Pb(2+); Selectivity