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Type: Artigo de periódico
Title: Synthesis and application of imprinted polyvinylimidazole-silica hybrid copolymer for Pb2+ determination by flow-injection thermospray flame furnace atomic absorption spectrometry
Author: Tarley, CRT
Andrade, FN
de Oliveira, FM
Corazza, MZ
de Azevedo, LFM
Segatelli, MG
Abstract: A novel ion imprinted polyvinylimidazole-silica hybrid copolymer (IIHC) was synthesized and used as a selective solid sorbent for Pb2+ ions preconcentration using an on-line solid phase extraction (SPE) system coupled to TS-FF-AAS. The ionic hybrid sorbent was prepared using 1-vinylimidazole and 3-(trimethoxysilyl)propylmethacrylate as monomers, Pb2+ ions as template, tetraethoxysilane as reticulating agent and 2,2'-azobis-isobutyronitrile as initiator. The best on-line SPE conditions concerning sorption behavior, including sample pH (6.46), buffer concentration (9.0 mmol L-1), eluent (HNO3) concentration (0.5 mol L-1) and preconcentration flow rate (4.0 mL min(-1)), were optimized by means of full factorial design and Doehlert matrix. The analytical curve ranged from 2.5 to 65.0 mu g L-1 (r = 0.999) with limit of detection of 0.75 mu g L-1; the precision (repeatability) calculated as relative standard deviation (n = 10) was 5.0 and 3.6% for Pb2+ concentration of 10.0 and 60.0 mu g L-1, respectively. From on-line breakthrough curve, column capacity was 3.5 mg g(-1). Preconcentration factor (PF), consumptive index (CI) and concentration efficiency (CE) were 128.0, 0.16 mL and 25.6 min(-1), respectively. The selective performance of the sorbent, based on relative selectivity coefficient, was compared to NIC (non imprinted copolymer) for the binary mixture Pb2+/Cd2+, Pb2+/Cu2+ and Pb2+/Zn2+. The results showed that ion imprinted polyvinylimidazole-silica hybrid polymer had higher selectivity for Pb2+ than NIC at 64.9, 16.0 and 8.8 folds. The developed method was successfully applied for highly sensitive and selective Pb2+ determination in different kinds of water samples, parenteral solutions and urine. Accuracy was also assessed by analyzing certified reference fish protein (DORM-3) and marine sediment (MESS-3 and PACS-2) with satisfactory results. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Lead
Ion imprinted polyvinylimidazole-silica hybrid
Thermospray flame furnace atomic absorption spectrometry
Solid phase preconcentration
Country: Holanda
Editor: Elsevier Science Bv
Citation: Analytica Chimica Acta. Elsevier Science Bv, v. 703, n. 2, n. 145, n. 151, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.aca.2011.07.029
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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