Zincon-immobilized silica-coated magnetic Fe₃O₄ nanoparticles for solid-phase extraction and determination of trace lead in natural and drinking waters by graphite furnace atomic absorption spectrometry

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• 作者：Hong-mei Jiang^a ; ^b ; Zhong-peng Yan^b ; Yue Zhao^a ; Xin Hu^a ; Hong-zhen Lian^a ; ^{hzlian@nju.edu.cn}
• 关键词：Zincon&ndash ; Si&ndash ; MNPs ; zincon-immobilized silica-coated magnetic Fe3O4 nanoparticles ; SPE ; solid-phase extraction ; GFAAS ; graphite furnace atomic absorption spectrometry ; LOD ; limit of detection ; RSD ; relative standard deviation ; ICP-OES ; inductively
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：30 May, 2012
• 卷：94
• 期：Complete
• 页码：251-256
• 文件大小：833 K

摘要

A new protocol using zincon-immobilized silica-coated magnetic Fe₃O₄ nanoparticles (Zincon-Si-MNPs) as solid-phase extraction (SPE) medium has been developed for the separation and preconcentration of trace lead in water. Various parameters such as pH, extraction time, concentration and volume of eluent, sample volume, and influence of co-existing ions have been investigated in order to establish the optimum conditions for the determination of lead in combination with graphite furnace atomic absorption spectrometry (GFAAS). The detection limit (LOD) of the proposed method for lead based on an enrichment factor of 200 was 10 ng L^鈭?. The relative standard deviations (RSDs, n = 5) were 8.3%, 7.8%and 9.2%, respectively, at 5, 0.5 and 0.05 ng mL^鈭? levels. This method has been successfully applied to the analysis of trace lead in natural and drinking water samples and the recoveries for the spiked samples were in the range of 84-104%.