Chromium(III)-imprinted silica gel for speciation analysis of chromium in environmental water samples with ICP-MS detection

被引:154
作者
Zhang, Nan [1 ]
Suleiman, Jibrin Sabo [1 ]
He, Man [1 ]
Hu, Bin [1 ]
机构
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Hubei Province, Peoples R China
基金
中国国家自然科学基金;
关键词
chromium speciation; ion-imprinted silica gel sorbent; surface imprinting technique; environmental water samples; ICP-MS;
D O I
10.1016/j.talanta.2007.11.059
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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), 17 = 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. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:536 / 543
页数:8
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