Abstract
Abstract The electrocatalytic response of chemically modified carbon paste and glassy carbon electrodes with anchored Fe(II)/Fe(III) centers is presented for gaseous species such as NO 2 , SO 2 , H 2 S, and Cl 2 . Carbon paste electrodes are modified by direct admixing of tris[4,7-diphenyl-1,10-phenanthroline]iron(II) perchlorate, and glassy carbon electrodes are modified by oxidative electropolymerisation of tris[5-amino-1,10-phenanthroline]iron(II) perchlorate. The electrocatalytic cycle operating in the integrated reaction/pre-electrode layer of chemically modified electrodes results in significant signal enhancement. Chemical modification of the conducting surfaces protects the electrode surface from poisoning. evaluation was done in a continuous-flow system using gravitational flow fo supporting electrolyte carrier propulsion, direct injection of air containing parts per billion or parts per million (v/v) of the gaseous species, and amperometric detection with the chemically modified electrodes as part of a thin-layer cell.
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