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Reference type: Journal
Authors: Zhang N, Suleiman JS, He M, Hu B
Article Title: Chromium(III)-imprinted silica gel for speciation analysis of chromium in environmental water samples with ICP-MS detection.
Publication date: 2008
Journal: Talanta
Volume: 75
Issue: (2)
Page numbers: 536-543.
DOI: 10.1016/j.talanta.2007.11.059
Alternative URL: http://www.sciencedirect.com/science/article/B6THP-4R8NB6N-1/2/19730a1fe5c024604ef5e533c7611b61

Abstract: A new chromium(III)-imprinted 3-(2-aminoethylamino) propyltrimethoxysilane (AAPTS)-functionalized silica gel sorbent was synthesized by a surface imprinting technique and was employed as a selective solid-phase extraction material for speciation analysis of chromium in environmental water samples prior to its determination by inductively coupled plasma mass spectrometry (ICP-MS). The prepared Cr(III)-imprinted silica gel shows the selectivity coefficient of more than 700 for Cr(III) in the presence of Mn(II). The static adsorption capacity of the ion-imprinted and non-imprinted sorbent for Cr(III) were 30.5 mg g-1 and 13.4 mg g-1. It was also found that Cr(VI) could be adsorbed at low pH by the prepared imprinted silica gel, and this finding makes it feasible to enrich and determine Cr(VI) at low pH without adding reducing reagents. The imprinted silica gel sorbent offered a fast kinetics for the adsorption and desorption of both chromium species. Under the optimized conditions, the detection limits of 4.43 pg mL-1 and 8.30 pg mL-1 with the relative standard deviations (R.S.D.s) of 4.44% and 4.41% (C = 0.5 ng mL-1, n = 7) for Cr(III) and Cr(VI) were obtained, respectively. The proposed method was successfully applied to the speciation of trace chromium in environmental water samples. To validate the proposed method, two certified reference materials were analyzed and the determined values were in a good agreement with the certified values. The developed method is rapid, selective, sensitive and applicable for the speciation of trace chromium in environmental water samples
Author keywords: Chromium speciation, Ion-imprinted silica gel sorbent, Surface imprinting technique, Environmental water samples, ICP-MS

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