Preparation and characterization of a new design of carbon-felt electrode for phenolic endocrine disruptors

The construction and characterization of a new carbon-felt electrode design of small dimensions is reported. The electrode was checked by testing the electrochemical behaviour of the Fe(CN)(6)(3-/4)- model system, as well as of several phenolic compounds with xenoestrogenic properties. The use of a carbon-felt cylinder electrode whose heigh was insulated with a poly(ethylene) cover and with two exposed bases of 2.0 mm diameter, resulted in an enhancement of the Fe(CN)(6)(3-/4-) voltammetric peak current with respect to a conventional glassy carbon electrode with a similar outersurface, which suggests a high contribution of the redox probe solution trapped in the three-dimensional structure of the electrode. The contribution of the electrolysis of the redox probe trapped in the electrode matrix to the voltammetric response, as well as that of the mass transfer from bulk solution, were investigated. The voltammetric behaviour of phenolic compounds with xenoestrogenic properties showed adsorption onto the carbon-felt electrode. Penetration of these compounds into the electrode at open circuit was demonstrated. Two possible applications of the new electrode design are outlined: flow analysis with electrochemical detection of phenolic endocrine disruptors and the possibility of using it for removal of these compounds. (c) 2005 Elsevier Ltd. All rights reserved.