Voltammetric determination of dihydroxybenzene isomers using a disposable pencil graphite electrode modified with cobalt-phthalocyanine
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A novel voltammetric assay for the simultaneous determination of hydroquinone (HQ), catechol (CC) and resorcinol (RS) by using an electrochemically treated pencil graphite electrode modified with cobalt-phthalocyanine is described. Differential pulse voltammetric results showed three well-distinct oxidation peaks for HQ, CC and RS at 102 mV, 203 mV and 591 mV (vs. Ag/AgCl), respectively. Thus, the method can be applied to direct simultaneous determination without previous separation. The detection limits are 3.38 × 10−7 mol L−1 for HQ, 3.40 × 10−7 mol L−1 for CC and 7.23 × 10−7 mol L−1 for RS. The method was successfully applied to the direct determination of dihydroxybenzene isomers in tea samples, and the results were compared with chromatographic data.
KeywordsSensor Mediator Electrochemically treated Electrooxidation Simultaneous determination Tea sample
This work was supported by Romanian Executive Unit for Funding Higher Education, Research, Development and Innovation (UEFISCDI), Grants numbers 251/2011, and 64/2011.
Compliance with ethical standards
The authors declare that they have no conflict of interest.
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