ELECTROCHEMICAL-BEHAVIOR OF CLENBUTEROL AT NAFION-MODIFIED CARBON-PASTE ELECTRODES

A detailed study of the electrochemistry of clenbuterol at bare carbon -paste electrodes (CPEs) has been carried out. Results showed that cle nbuterol undergoes an ECE process. This compound is irreversibly oxidi sed at high potentials, resulting in the formation of a product which demonstrates quasi-reversible electrochemical behaviour at less positi ve potentials. The amount of this chemical product formed is very pH-d ependent. Investigations into the electrochemical behaviour of clenbut erol al Nafion-modified CPEs were also made. The use of a thin Nafion film cast over the CPE resulted in a large increase in peak current ov er bare electrodes. Linear accumulation occurred with time, the linear range increasing with decreasing concentration. This allowed the dete ction of low concentrations of clenbuterol. Diffusion proved to be the rate-controlling process of clenbuterol through the Nafion membrane.