dc.creator | Stevic, Milica C. | |
dc.creator | Ignjatovic, Ljubisa M. | |
dc.creator | Ćirić-Marjanović, Gordana | |
dc.creator | Stanišić, Svetlana M. | |
dc.creator | Stanković, Dalibor | |
dc.creator | Zima, Jiri | |
dc.date.accessioned | 2018-11-22T00:18:20Z | |
dc.date.available | 2018-11-22T00:18:20Z | |
dc.date.issued | 2011 | |
dc.identifier.issn | 1452-3981 | |
dc.identifier.uri | https://cherry.chem.bg.ac.rs/handle/123456789/1171 | |
dc.description.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. | en |
dc.publisher | Electrochemical Science Group, Belgrade | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172030/RS// | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172043/RS// | |
dc.rights | restrictedAccess | |
dc.source | International Journal of Electrochemical Science | |
dc.subject | 8-Hydroxyquinoline | en |
dc.subject | Glassy Carbon Paste Electrode | en |
dc.subject | Cyclic Voltammetry | en |
dc.subject | Differential Pulse Voltammetry | en |
dc.subject | Computational method | en |
dc.title | Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism | en |
dc.type | article | |
dc.rights.license | ARR | |
dcterms.abstract | Станковић, Далибор; Стевиц, Милица Ц.; Игњатовиц, Љубиса М.; Цириц-Марјановиц, Гордана; Станисиц, Светлана М.; Зима, Јири; | |
dc.citation.volume | 6 | |
dc.citation.issue | 7 | |
dc.citation.spage | 2509 | |
dc.citation.epage | 2525 | |
dc.identifier.wos | 000292331400017 | |
dc.citation.other | 6(7): 2509-2525 | |
dc.citation.rank | M22 | |
dc.type.version | publishedVersion | en |
dc.identifier.scopus | 2-s2.0-79960547798 | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_cherry_1171 | |