Preparation of Pb(II) Ion Imprinted Polymer and Its Application as the Interface of an Electrochemical Sensor for Trace Lead Determination

• Published in: Analytical Sciences Vol. 32; no. 9; pp. 975 - 980
• Main Authors: HU, Shanling, XIONG, Xiaodong, HUANG, Shuiying, LAI, Xiaoqi
• Format: Journal Article
• Language: English
• Published: Singapore The Japan Society for Analytical Chemistry 2016; Springer Nature Singapore
• Subjects: Analytical Chemistry; Chemistry; differential pulse voltammetry; electrochemical sensor; Electrochemistry - instrumentation; Environmental Pollutants - analysis; Environmental Pollutants - chemistry; imprinted polymer; Lead - analysis; Lead - chemistry; Lead ion; Limit of Detection; Molecular Imprinting; Oryza - chemistry; Oxyquinoline - chemistry; Polymethacrylic Acids - chemical synthesis; Water - chemistry; imprinted polymer; Lead ion; differential pulse voltammetry; electrochemical sensor
• ISSN: 0910-6340; 1348-2246
• DOI: 10.2116/analsci.32.975

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.