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Reference type: Journal
Authors: He Q, Chang XJ, Wu Q, Huang XP, Hu Z, Zhai YH
Article Title: Synthesis and applications of surface-grafted Th(IV)-imprinted polymers for selective solid-phase extraction of thorium(IV).
Publication date: 2007
Journal: Analytica Chimica Acta
Volume: 605
Issue: (2)
Page numbers: 192-197.
DOI: 10.1016/j.aca.2007.10.026
Alternative URL: http://www.sciencedirect.com/science/article/B6TF4-4PYYTW0-2/2/479ae0154258b908e07e5ffcdd6554e8

Abstract: A new functional monomer N-(o-carboxyphenyl)maleamic acid (CPMA) was synthesized and chosen for the preparation of surface-grafted ion-imprinted polymers (IIPs) specific for thorium(IV). Polymerizable double bond was introduced to silica gel surface by amidation reaction between -NH2 and maleic anhydride. In the ion-imprinting process, thorium(IV) was complexed with the carboxyl groups, then was imprinted in the polymers grafted to the silica gel surface. The imprinted Th(IV) was removed with 3 mol L-1 HCl. The obtained imprinted particles exhibited excellent selectivity and rapid kinetics process for Th(IV). The relatively selective factor (αr) values of Th(IV)/La(III), Th(IV)/Ce(III), Th(IV)/Nd(III), Th(IV)/U(VI), and Th(IV)/Zr(IV) were 85.7, 88.9, 26.6, 64.4, and 433.8, respectively, which were greater than 1. The precision (R.S.D.), the detection limit (3σ), and the quantification limit (10σ) of the method were 1.9%, 0.51 ng mL-1 and 1.19 ng mL-1, respectively. The prepared IIPs as solid-phase extractants were successfully applied for the preconcentration of trace thorium in natural and certified samples prior to its determination by inductively coupled plasma atomic emission spectrometry (ICP-AES) with satisfactory results
Template and target information:
Author keywords: Ion-imprinted polymers, N-(o-carboxyphenyl)maleamic acid, Solid-phase extraction, Inductively coupled plasma atomic emission spectrometry, Thorium(IV)

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