Solid-phase extraction of iron(III) with an ion-imprinted functionalized silica gel sorbent prepared by a surface imprinting technique

被引:147
作者
Chang, Xijun [1 ]
Jiang, Na
Zheng, Hong
He, Qun
Hu, Zheng
Zhai, Yunhui
Cui, Yuemei
机构
[1] Lanzhou Univ, Sch Chem & Chem Engn, Lanzhou 730000, Peoples R China
[2] Qinghai Normal Univ, Xining 810008, Peoples R China
关键词
Fe(III)-imprinted amino-functionalized silica gel sorbent; preparation; surface imprinting technique; solid-phase extraction (SPE); ICP-AES;
D O I
10.1016/j.talanta.2006.03.012
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new Fe(Ill)-imprinted amino-functionalized silica get sorbent was prepared by a surface imprinting technique for selective solid-phase extraction (SPE) of Fe(Ill) prior to its determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). Compared with non-imprinted polymer particles, the ion-imprinted polymers IIPs) had higher selectivity and adsorption capacity for Fe(III). The maximum static adsorption capacity of the ion-imprinted and non-imprinted sorbent for Fe(111) was 25.21 and 5. 10 mg g(-1), respectively. The largest selectivity coefficient of the Fe(Ill)-imprinted sorbent for Fe(111) in the presence of Cr(III) was over 450. The relatively selective factor (alpha(r)) values of Fe(III)/Cr(III) were 49.9 and 42.4, which were greater than 1. The distribution ratio (D) values of Fe(Ill)-imprinted polymers for Fe(III) were greatly larger than that for Cr(III). The detection limit (3 sigma) was 0.34 mu g L-1. The relative standard deviation of the method was 1.50% for eight replicate determinations. The method was validated by analyzing two certified reference materials (GBW 08301 and GBW 08303), the results obtained is in good agreement with standard values. The developed method was also successfully applied to the determination of trace iron in plants and water samples with satisfactory results. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:38 / 43
页数:6
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