ELECTROCHEMICAL RESPONSE OF A CARBON-PASTE ELECTRODE CONTAINING AN ADSORBED SPECIES ON INCORPORATED ALUMINA

The electrochemical response of carbon paste electrode was investigate d containing an inorganic and a non-electroactive compound on which an electroactive organic molecule was adsorbed. Alizarin S was chosen as the test molecule adsorbed on 150 m(2)/g of alumina, because this mol ecule is either easily reduced or oxidized on carbon. The electrode re sponse was found to be linear for low amounts of alumina containing a known amount of Alizarin S. The electrical yield was never higher than 50%, but was reproducible. An increasing alumina amount in the paste increased the response, but lowered the electrical yield.