Journal
ELECTROANALYSIS
Volume 28, Issue 12, Pages 2965-2971Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201600157
Keywords
2,4-dinitrophenylhydrazine; glassy electrode; electrochemical impedance spectroscopy; industrial water
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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 0.3V 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 x 10(-8) mol L-1. The proposed methodology was satisfactorily applied to determine DNPH in industrial water samples.
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