RIV/00216208:11310/11:10112527 - 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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Identifikační kód:RIV/00216208:11310/11:10112527 Název v původním jazyce:Voltammetric Behaviour and Determination of 8-Hydroxyquinoline Using a Glassy Carbon Paste Electrode and the Theoretical Study of its Electrochemical Oxidation Mechanism Název česky: Druh:J - Článek v odborném periodiku Jazyk:eng - angličtina Obor:CG - Elektrochemie Rok uplatnění:2011 Kód důvěrnosti:S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů Počet tvůrců:6 Počet domácích tvůrců:1 Tvůrce:Stević, Milica C. Tvůrce: Ignjatović, Ljubiša M. Tvůrce: Ćirić-Marjanović, Gordana Tvůrce: Stanišić, Svetlana M. Tvůrce: Stanković, Dalibor M. Tvůrce: Zima, Jiří
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Popis v původním jazyce: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. Popis česky: Klíčová slova: Název periodka:International Journal of Electrochemical Science Rozsah stran: ISSN:1452-3981 Svazek periodika:6 Číslo periodika v rámci uvedeného svazku:7 Stát vydavatele periodika:RS - Srbská republika Počet stran výsledku:17 DOI:
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Předkladatel:Univerzita Karlova v Praze / Přírodovědecká fakulta (IČO: 216208) Dodavatel:MSM Rok sběru:2012 Systémové označení dodávky dat:RIV12-MSM-11310___/01:1 Kontrolní kód:[06FF6006C9B7]