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Voltammetric detection of hydrogen peroxide in teeth whitening gels
Philippe Westbroek, a, Jean Hakuzimana, a, Emmanuel Gasana, a, Pol Lombaer, b, and Paul Kiekens, a
a Ghent University, Department of Textiles, Technologiepark 907, B-9052 Gent, Belgium
b Remedent, Xavier De Cocklaan 42, B-9831 Deurle, Belgium
Received 30 August 2006; revised 20 December 2006; accepted 21 December 2006. Available online 28 December 2006.
Abstract
A voltammetric method is proposed to detect hydrogen peroxide in teeth whitening gels. First the conductive properties of the gels are studied and discussed in absence and presence of an electrolyte. Current̉potential curves recorded at a gold disc electrode show that hydrogen peroxide can be oxidized and reduced, especially in the oxidation the electrode surface condition plays an important role in the kinetics. The detection of hydrogen peroxide is done by calibration plots between, respectively, the reductive peak current and charge exchanged in the reduction peak as a function of hydrogen peroxide concentration. Also the long-term stability is investigated, which gave promising results.
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