Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4-dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode

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• 作者：W. Boumya ; H. Hammani ; A. Loudiki ; M. Achak ; M. Bakasse and M. A. El Mhammedi
• 刊名：Electroanalysis
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：28
• 期：12
• 页码：2965-2971
• 全文大小：1042K
• ISSN：1521-4109

文摘

This paper reports on the use of electrochemical impedance spectroscopy (EIS) allied to copper (II) for the determination of 2,4-dinitrophenylhydrazine (DNPH) at glassy carbon electrode (GCE). The experiment measurements were carried out in methanol at a potential of 0.3 V versus Ag/AgCl. The Nyquist plots were modeled with a Randle equivalent circuit, by identifying the charge transfer resistance as the relevant concentration dependent parameter. These measurements show that the impedance spectra of DNPH increased by the formation of non-electroactive compound produced from specific interaction between DNPH and Cu (II), which will block the electron-transfer process of the redox probe. Therefore, the proposed methodology offers a detection limit of 4.0×10⁻⁸ mol L⁻¹. The proposed methodology was satisfactorily applied to determine DNPH in industrial water samples.