title: Ion-imprinted silica adsorbent modified diffusive gradients in thin films technique: Tool for speciation analysis of free lead species.
abstract: A new diffusive gradients in thin films (DGT) device, using Pb(II) ion-imprinted silica (IIS) as the binding agents and commercial cellulose acetate dialysis (CAD) membrane as the diffusion layer (CAD/IIS-DGT), has been developed and evaluated for sampling and measurement of free Pb(II) species. The CAD/IIS-DGT devices were successfully applied to the measurement of free Pb(II) species in synthetic solutions, in natural freshwaters and in industrial wastewaters. The CAD/IIS-DGT provides reliable results over pH range of 4.5-6.5 and a wide range of ionic strength from 1.0×10(-3) to 0.7 mol L(-1). The concentrations of the free Pb(II) species in synthetic solution containing different concentrations of ligands measured by CAD/IIS-DGT showed a good agreement with the value measured by Pb-ion selective electrode. Field deployments of the CAD/IIS-DGT devices allowed accurate measurements of the concentrations of free Pb(II) species.
authors.affiliation: College of Sciences, Northeastern University, Shenyang 110004, China. Electronic address: sdp2596@163.com.
authors.forename: Dian-Peng
authors.initials: DP
authors.lastname: Sui
authors.affiliation: College of Sciences, Northeastern University, Shenyang 110004, China.
authors.forename: Hua-Xia
authors.initials: HX
authors.lastname: Chen
authors.affiliation: College of Sciences, Northeastern University, Shenyang 110004, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.affiliation: Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang, 100142 Liaoning, China.
authors.forename: Ming-Xuan
authors.initials: MX
authors.lastname: Liu
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. Electronic address: httyf_77@163.com.
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Fan
mesh_terms: D000327:Adsorption; D004058:Diffusion; D004588:Electrophoresis, Cellulose Acetate / Q000379:methods; D007854:Lead / Q000032:analysis*; D054802:Molecular Imprinting / Q000379:methods*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D007854:Lead; D012822:Silicon Dioxide
keywords: Diffusive gradients in thin films; Ion-imprinted; Lead; Water