Determination of trace 2,4-dinitrophenol in surface water samples based on hydrophilic molecularly imprinted polymers/nickel fiber electrode

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• 作者：Tao Jing^a ; Huan Xia^a ; Jiwei Niu^a ; Yusun Zhou^a ; Qing Dai^a ; Qiaolin Hao^a ; Yikai Zhou^a ; Surong Mei ; ^a ; ^{meisurong@yahoo.com.cn"" rel=""nofollow}
• 关键词：Hydrophilic molecularly imprinted polymers ; Nickel fiber ; 2 ; 4-Dinitrophenol ; Electrochemical sensor ; Surface water samples
• 刊名：Biosensors and Bioelectronics
• 出版年：2011
• 出版时间：15 July 2011
• 年：2011
• 卷：26
• 期：11
• 页码：4450-4456
• 全文大小：545 K

文摘

A rapid, sensitive and selective electrochemical method was proposed for the determination of 2,4-dinitrophenol (2,4-DNP) in surface water samples, using hydrophilic molecular imprinted polymers (MIPs) as the recognition element and nickel (Ni) fiber as the catalytic element. Hydrophilic MIPs were synthesized using 2,4-DNP as the template, acrylamide as the monomer, glycidilmethacrylate as the pro-hydrophilic co-monomer and acetonitrile as the solvent. Hydrophilic modification could enhance the accessibility of 2,4-DNP to the imprinted cavities and improve the selective recognition properties of traditional MIPs in water medium. Subsequently, hydrophilic MIPs/Ni fiber electrode was prepared to determine trace 2,4-DNP by cyclic voltammetry. The parameters affecting the analytical performance were investigated. Under optimized conditions, the linear range was 0.7–30 μg L⁻¹ and the detection limit was 0.1 μg L⁻¹. Finally, the proposed method was applied to measure 2,4-DNP in surface water samples. The spiked recoveries were changed from 91.3 % to 102.6 % and the RSD was not higher than 5.1 % . There was no statistically significant difference between the results obtained by the proposed method and the traditional chromatographic method.