Modification of glassy carbon electrode with a polymer/mediator composite and its application for the electrochemical detection of iodate

► FAD and PEDOT are combined to modify the glassy carbon electrode for IO3− sensing. ► The doping of FAD into PEDOT matrix can almost be viewed as an irreversible process. ► The optimal cycle number for preparing the GCE/PEDOT/FAD electrode is found to be 9. ► The detection limit of the GCE/PEDOT/FAD electrode for IO3− is found to be 0.16 μM. ► The GCE/PEDOT/FAD electrode possesses enough selectivity toward IO3−.