期刊
TALANTA
卷 129, 期 -, 页码 100-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2014.05.014
关键词
Amino-functionalization; Metal-organic frameworks; Differential pulse anodic stripping; voltammetry; Lead
资金
- National Natural Science Foundation of China [21205103, 21275124]
- Jiangsu Provincial Nature Foundation of China [BK2012258]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Metal-organic frameworks composite materials have received tremendous attention because of their versatile structures and tunable porosity for various applications. Herein, amino-functionalized metal-organic frameworks (NH2-Cu-3(BTC)(2); BTC=benzene-1,3,5-tricarboxylate) was prepared and used as a novel electrode modifier for the determination of trace levels of lead. NH2-Cu-3(BTC)(2) shows quite a good capability for the efficient adsorption of lead from aqueous solutions. The parameters affecting the electrochemical process, such as electrolyte solution pH, the amount of NH2-Cu-3(STC)(2) suspension, accumulation potential and accumulation time, were investigated in detail. Under the optimal conditions, the electrochemical sensor exhibited a linear response to the concentration of lead in the range of 1.0 x 10(-8)-5.0 x 10(-7) mol L-1 (R-2=0.9951) with a detection limit of 5.0 x 10(-9) mol L-1. The relative standard deviation of 11 successive scans was 3.10% for 1.0 x 10(-8) mol L-1 lead. The method was validated with certified reference material (stream sediment and milk powder) and the analytical results coincided well with the certified values. Furthermore, the method was successfully applied to the determination of target analytes in tap and lake water samples and good recoveries were obtained from different spiked values. (C) 2014 Elsevier B.V. All rights reserved.
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