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Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism

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Authors
Stevic, Milica C.
Ignjatovic, Ljubisa M.
Ćirić-Marjanović, Gordana
Stanišić, Svetlana M.
Stanković, Dalibor
Zima, Jiri
Article (Published version)
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Abstract
The 8-Hydroxyquinoline (8HQ) oxidation process has been investigated by Cyclic Voltammetry using a Glassy Carbon Paste Electrode (GCPE) as a working electrode. The theoretical study of the mechanism of electrochemical oxidation of 8HQ has been based on the AM1 semi-empirical quantum chemical computations of the heats of formation of the reaction intermediates, taking into account the influence of pH and solvation effects. We proposed that a two-electron irreversible process, controlled by diffusion of electroactive species, is responsible for an oxidation peak of 8HQ that appears in all cyclic voltammograms recorded on a clean electrode in the solutions of pH in the range 2-12 with a supporting electrolyte of Britton-Robinson Buffer/methanol. A single-electron oxidation of 8HQ leads, depending on pH, to the formation of various free radical species that combine to make dimers which, after being oxidized once more, give quinonoid-type compounds. Recording continuous cyclic voltammograms... on the GCPE, pre-peaks appear as a consequence of dimer and quinonoid compounds formation. By applying Differential Pulse Voltammetry for 8HQ determination it was calculated that the limit of detection was 5.2x10(-8) mol/L. For more sensitive quantitative determination of the investigated substance Adsorptive Stripping Differential Pulse Voltammery can be used since it was found that after 300s-deposition time at 0.0 V vs. Saturated Calomel Electrode, a 2.1 times higher peak current than without deposition was obtained.

Keywords:
8-Hydroxyquinoline / Glassy Carbon Paste Electrode / Cyclic Voltammetry / Differential Pulse Voltammetry / Computational method
Source:
International Journal of Electrochemical Science, 2011, 6, 7, 2509-2525
Publisher:
  • Electrochemical Science Group, Belgrade
Funding / projects:
  • Application of advanced oxidation processes and nanostructured oxide materials for the removal of pollutants from the environment, development and optimisation of instrumental techniques for efficiency monitoring (RS-172030)
  • Electroconducting and redox-active polymers and oligomers: synthesis, structure, properties and applications (RS-172043)

ISSN: 1452-3981

WoS: 000292331400017

Scopus: 2-s2.0-79960547798
[ Google Scholar ]
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23
Handle
https://hdl.handle.net/21.15107/rcub_cherry_1171
URI
https://cherry.chem.bg.ac.rs/handle/123456789/1171
Collections
  • Publikacije
Institution/Community
Inovacioni centar
TY  - JOUR
AU  - Stevic, Milica C.
AU  - Ignjatovic, Ljubisa M.
AU  - Ćirić-Marjanović, Gordana
AU  - Stanišić, Svetlana M.
AU  - Stanković, Dalibor
AU  - Zima, Jiri
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1171
AB  - The 8-Hydroxyquinoline (8HQ) oxidation process has been investigated by Cyclic Voltammetry using a Glassy Carbon Paste Electrode (GCPE) as a working electrode. The theoretical study of the mechanism of electrochemical oxidation of 8HQ has been based on the AM1 semi-empirical quantum chemical computations of the heats of formation of the reaction intermediates, taking into account the influence of pH and solvation effects. We proposed that a two-electron irreversible process, controlled by diffusion of electroactive species, is responsible for an oxidation peak of 8HQ that appears in all cyclic voltammograms recorded on a clean electrode in the solutions of pH in the range 2-12 with a supporting electrolyte of Britton-Robinson Buffer/methanol. A single-electron oxidation of 8HQ leads, depending on pH, to the formation of various free radical species that combine to make dimers which, after being oxidized once more, give quinonoid-type compounds. Recording continuous cyclic voltammograms on the GCPE, pre-peaks appear as a consequence of dimer and quinonoid compounds formation. By applying Differential Pulse Voltammetry for 8HQ determination it was calculated that the limit of detection was 5.2x10(-8) mol/L. For more sensitive quantitative determination of the investigated substance Adsorptive Stripping Differential Pulse Voltammery can be used since it was found that after 300s-deposition time at 0.0 V vs. Saturated Calomel Electrode, a 2.1 times higher peak current than without deposition was obtained.
PB  - Electrochemical Science Group, Belgrade
T2  - International Journal of Electrochemical Science
T1  - Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism
VL  - 6
IS  - 7
SP  - 2509
EP  - 2525
UR  - https://hdl.handle.net/21.15107/rcub_cherry_1171
UR  - Kon_2193
ER  - 
@article{
author = "Stevic, Milica C. and Ignjatovic, Ljubisa M. and Ćirić-Marjanović, Gordana and Stanišić, Svetlana M. and Stanković, Dalibor and Zima, Jiri",
year = "2011",
abstract = "The 8-Hydroxyquinoline (8HQ) oxidation process has been investigated by Cyclic Voltammetry using a Glassy Carbon Paste Electrode (GCPE) as a working electrode. The theoretical study of the mechanism of electrochemical oxidation of 8HQ has been based on the AM1 semi-empirical quantum chemical computations of the heats of formation of the reaction intermediates, taking into account the influence of pH and solvation effects. We proposed that a two-electron irreversible process, controlled by diffusion of electroactive species, is responsible for an oxidation peak of 8HQ that appears in all cyclic voltammograms recorded on a clean electrode in the solutions of pH in the range 2-12 with a supporting electrolyte of Britton-Robinson Buffer/methanol. A single-electron oxidation of 8HQ leads, depending on pH, to the formation of various free radical species that combine to make dimers which, after being oxidized once more, give quinonoid-type compounds. Recording continuous cyclic voltammograms on the GCPE, pre-peaks appear as a consequence of dimer and quinonoid compounds formation. By applying Differential Pulse Voltammetry for 8HQ determination it was calculated that the limit of detection was 5.2x10(-8) mol/L. For more sensitive quantitative determination of the investigated substance Adsorptive Stripping Differential Pulse Voltammery can be used since it was found that after 300s-deposition time at 0.0 V vs. Saturated Calomel Electrode, a 2.1 times higher peak current than without deposition was obtained.",
publisher = "Electrochemical Science Group, Belgrade",
journal = "International Journal of Electrochemical Science",
title = "Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism",
volume = "6",
number = "7",
pages = "2509-2525",
url = "https://hdl.handle.net/21.15107/rcub_cherry_1171, Kon_2193"
}
Stevic, M. C., Ignjatovic, L. M., Ćirić-Marjanović, G., Stanišić, S. M., Stanković, D.,& Zima, J.. (2011). Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism. in International Journal of Electrochemical Science
Electrochemical Science Group, Belgrade., 6(7), 2509-2525.
https://hdl.handle.net/21.15107/rcub_cherry_1171
Stevic MC, Ignjatovic LM, Ćirić-Marjanović G, Stanišić SM, Stanković D, Zima J. Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism. in International Journal of Electrochemical Science. 2011;6(7):2509-2525.
https://hdl.handle.net/21.15107/rcub_cherry_1171 .
Stevic, Milica C., Ignjatovic, Ljubisa M., Ćirić-Marjanović, Gordana, Stanišić, Svetlana M., Stanković, Dalibor, Zima, Jiri, "Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism" in International Journal of Electrochemical Science, 6, no. 7 (2011):2509-2525,
https://hdl.handle.net/21.15107/rcub_cherry_1171 .

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