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Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4‐dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode
Author(s) -
Boumya W.,
Hammani H.,
Loudiki A.,
Achak M.,
Bakasse M.,
El Mhammedi M. A.
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600157
Subject(s) - dielectric spectroscopy , copper , nyquist plot , electrode , redox , electrochemistry , detection limit , analytical chemistry (journal) , glassy carbon , electrical impedance , chemistry , electron transfer , materials science , inorganic chemistry , cyclic voltammetry , chromatography , organic chemistry , electrical engineering , engineering
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.