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Reference type: Journal
Authors: Bojdi MK, Mashhadizadeh MH, Behbahani M, Farahani A, Davarani SSH, Bagheri A
Article Title: Synthesis, characterization and application of novel lead imprinted polymer nanoparticles as a high selective electrochemical sensor for ultra-trace determination of lead ions in complex matrixes.
Publication date: 2014
Journal: Electrochimica Acta
Volume: 136
Page numbers: 59-65.
DOI: 10.1016/j.electacta.2014.05.095
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0013468614010962

Abstract: We report on the design of a lead(II)-selective electrode based on the use of lead(II) imprinted polymer nanoparticles (IP-NPs), and its application for the differential pulse voltammetry determination of lead ions. The IP-NPs were obtained by precipitation polymerization of 4-vinylpyridine (the functional monomer), ethylene glycol dimethacrylate (the cross-linker), 2,2'-azobisisobutyronitrile (the initiator), 4-(2-pyridylazo)resorcinol (the lead-binding ligand), and lead ions (the template ion) in acetonitrile solution. After polymerization, the Pb(II) in the polymer nanoparticles were leached out with dilute hydrochloric acid to create cavities for hosting Pb(II). The new sensor showed high selectivity for lead ions in the presence of common potential interferences according to the specific recognition nature of the synthesized material. A carbon paste electrode was modified with the IP-NPs, and differential pulse stripping voltammetry was applied as the detection technique after open-circuit sorption of Pb(II) ions and its reduction to the metallic form. An explicit difference in the response was observed between the electrodes modified with IP-NPs and electrodes modified with non-IP-NPs. The modified electrode responds to Pb(II) was linear in the 0.1 nM to 10 nM (with sensitivity of 49.179 nA/nM) and in the 10 nM to 10 μM (with sensitivity of 30.305 μA/μM) concentration range. The limit of detection (LOD) of the sensor was 30 pM (at S/N =3). The sensor was successfully applied to the trace determination of Pb(II) in spiked environmental water samples
Template and target information: lead ion, Pb(II)
Author keywords: Carbon past electrode, Lead imprinted polymer nanoparticles, Differential pulse anodic stripping voltammetry, Environmental water samples

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