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Abstract: A new ion-selective cross-linked poly(vinylimidazole-co-ethylene glycol dimethacrylate) prepared via a double-imprinting process was developed for the recognition and preconcentration of Pb2+ from water samples. The sorbent was characterized by FT-IR, SEM, TGA and textural data. The maximum dynamic sorption capacity of Pb2+ was 42.04 mg Pb2+ g-1 of the double-imprinted polymer. The sorption kinetics data were described by a pseudo-second-order model. The double-imprinted polymer exhibited a higher sorption efficiency of Pb2+ than the blank polymer (non-imprinted polymer). The preconcentration procedure involved the loading of a Pb2+ solution at pH 7.25 through 40.0 mg of the double-imprinted polymer packed in a mini-column at 5.0 mL min-1. The selective efficiency of proposed method for the Pb2+ preconcentration was assured by competitive sorption using different proportions of Pb2+/cations and Pb2+/anions. An analytical curve was obtained in the range 0.0-300.0 μg L-1 (r = 0.999) and a limit of detection of 2.46 μg L-1 was obtained. The preconcentration factor was found to be 21, the consumptive index 0.95 mL and the concentration efficiency 5.25 min-1. The preconcentration method was successfully applied to the Pb2+ ions determination in different kinds of water samples with high recovery values (91.3-108.9%)
Template and target information: lead ion, Pb(II)
Author keywords: Hierarchically imprinted organic polymer, Pb2+, selectivity, FAAS