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Abstract: This paper reports the fabrication of new lead ion potentiometric sensors using 2,2':6',6''-terpyridine (Terpy)-based Pb2+-imprinted polymeric (IIP) nanoparticles as the sensing component. Pb2+ ions form a stable 1:2 (metal to ligand) complex with Terpy in acetonitrile solution. The resulting Pb(Terpy)22+ complex was then polymerized with ethyleneglycol dimethacrylate, as a cross-linking monomer, via the precipitation copolymerization method. The imprinting resulted in the enhanced affinity of the material to Pb2+ over alternative competing ions. Thus, the selectivity investigations showed no measurable interference of a variety of transition and heavy metal ions for determination of Pb2+ ions. The sorption/desorption of Pb2+ ions on the IIP nanobeads was quick enough to attain relatively fast response potentiometric sensors with response times of 15-45 s. The synthesized Pb2+-IIP was applied as a sensing unit for the procurement of sensitive potentiometric sensors with high selectivity for sub-nanomolar determination of lead(II), with a limit of detection and a linear range of 3.4 × 10-10 and 5.3 × 10-10-1.0 × 10-1 M, respectively. The optimized pH interval for the maximum sensitivity of the designed sensors was 4.5-8.0. The accuracy of the sensors was explored by the analysis of diverse water samples. The prepared sensors were successfully applied to detect traces of Pb2+ ions in different real aqueous matrices
Template and target information: lead ion, Pb(II)
Author keywords: precipitation polymerization, Pb2+ ion, Ion-imprinted polymeric nanoparticles, IIP-modified graphite electrode, Potentiometric sensors