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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 16 (2011) pp 286-287

Simultaneous Determination of Catechol and Ascorbic Acid with CTAB Modified Carbon Paste Electrode: an Inquiry-Based Experience

Miyong Hughes, Phuong Khanh Quoc Nguyen and Suzanne K. Lunsford*

Wright State University, Department of Chemistry, 3640 Colonel Glenn Hwy, Dayton, Ohio 45435,
Received January 23, 2011. Accepted October 9, 2011.

Published: 14 October 2011

Abstract. 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.

Key Words: Laboratories and Demonstrations; inorganic chemistry; electroanalytical chemistry

(*) Corresponding author. (E-mail:

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