Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium

Jimenez-Perez, Rebeca and Sevilla, J. M. and Pineda, T. and Blázquez, M. and Gonzalez-Rodriguez, J. (2013) Electrochemical behaviour of gamma hydroxybutyric acid at a platinum electrode in acidic medium. Electrochimica Acta, 111 . pp. 601-607. ISSN 0013-4686

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Abstract

The electrooxidation of Gamma Hydroxybutyric Acid (GHB) on a polycrystalline platinum electrode is studied by cyclic voltammetry in acidic medium. Two oxidation peaks, A and B, are obtained in the positive scan within the potential range of the double layer region and of the platinum oxide region, respectively. In the negative going potential sweep an inverted oxidation peak with an onset partially overlapping with the tail of the cathodic peak for the reduction of the platinum oxide formed during the anodic scan is obtained (peak C). This inverted peak can be observed at a potential close to +0.2 V (vs Ag/AgCl at pH 2) and separated 0.4 and 0.8 V from the two other oxidation peaks obtained during the anodic scan and in such conditions that the surface is particularly activated to favour this electrochemical process. The response obtained in the electronic current for the different peaks when GHB concentration and scan rate were changed to allows inferring that these are the result of a potential dependent mechanism. The behaviour observed is according with the oxidation of the alcohol group to the corresponding aldehyde and carboxylic acid (succinic acid) as main products.

Keywords:GHB, Electrochemical oxidation, Platinum electrode, Forensic Science, Analytical chemistry, Physical chemistry
Subjects:F Physical Sciences > F170 Physical Chemistry
F Physical Sciences > F400 Forensic and Archaeological Science
F Physical Sciences > F180 Analytical Chemistry
Divisions:College of Science > School of Life Sciences
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ID Code:11752
Deposited On:30 Aug 2013 08:58

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