title: A method for measurement of free cadmium species in waters using diffusive gradients in thin films technique with an ion-imprinted sorbent.
abstract: A diffusive gradients in thin films (DGT) device for the analysis of free Cd(II) species, based on Cd(II) ion-imprinted sorbent (IIS) as the binding agents and commercial polyethersulfone membrane (PES) as diffusion layer, was developed (PES/IIS-DGT). DGT time-series experiments showed that the mass of free Cd(II) species accumulated by PES/IIS-DGT was linear vs. time (R(2) = 0.9953) and the concentration of free Cd(II) species by PES/IIS-DGT was in good agreement with the total dissolved concentrations of free Cd(II) species in simple synthetic solutions where free ionic species dominated. PES/IIS-DGT performance was independent in the range of pH 4.5-7.5 and ionic strength range from 1.0 × 10(-3) to 0.7 mol L(-1). The measurement of free Cd(II) species in synthetic solution containing different concentrations of ligands by PES/IIS-DGT showed an excellent agreement with the value measured by Cd(II) ion selective electrodes (Cd-ISE), indicating that PES/IIS-DGT method is more suitable than Cd-ISE for the measurement of low concentration of free Cd(II) species due to the enrichment of IIS for the analytes.
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China. Electronic address: httyf_77@163.com.
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Fan
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
authors.forename: Ai-Juan
authors.initials: AJ
authors.lastname: Liu
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Jiang
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Shen
authors.affiliation: Food Engineering, Shandong Business Institute, Yantai, 264670, China.
authors.forename: Cong-Cong
authors.initials: CC
authors.lastname: Huang
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
authors.forename: Wen-Xiu
authors.initials: WX
authors.lastname: Li
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis*; D004058:Diffusion; D054802:Molecular Imprinting; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cadmium; Diffusive gradients in thin-films; Free species; Ion-imprinted