Undergraduate experiment demonstrates effective detection of catechol and ascorbic acid, suggesting potential lab applications.
An undergraduate laboratory experiment for inorganic /electroanalytical chemistry is described utilizing an everyday surfactant as a sensor. A cation surfactant Cetyltrimethyl ammonium Bromide (CTAB) modified carbon paste electrode was fabricated and applied to simultaneous determination of ascorbic acid, and catechol. The modified electrode resolved the overlapped voltammetric responses of ascorbic acid and catechol into two well defined voltammetric peaks by cyclic voltammetry (CV). The results showed that the electrocatalytic activity of CTAB modified carbon paste electrode (CTABMCPE) was excellent when compared to bare carbon paste electrode (CPE). The modified electrode showed good selectivity, stability and antifouling properties. This lab allowed students to investigate how to build a carbon paste electrode with a capillary tube and modify the electrode surface with a surfactant CTAB to detect catechol in the presence of common interferences such as ascorbic acid.
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Hughes et al. (2011) studied this question.
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