Electrochemical reduction and flow detection of iodate on (Bu 4 N) 2 Mo 6 O 19 self-assembled monolayer

A stable monolayer of the inorganic–organic hybrid polyoxometalate (Bu 4 N) 2 Mo 6 O 19 , denoted as Mo 6 O 19 , was formed on a sodium-3-mercapto-1-propanesulfonate (MPPS)-covered gold electrode surface, interlaced with an anionic poly(dimethyldiallylammonium chloride) (PDDA) binding layer based on the electrostatic self-assembled (ESA) technique. Electrochemical characterization of the Mo 6 O 19 self-assembled thin films on the solid surface by cyclic voltammetry and AC impedance spectroscopy revealed a stable and sensitive electrocatalytic response to the reduction of iodate. Iodate was determined amperometrically through a flow injection cell at the modified electrode in the concentration range of 1.0×10 −6 to 1.0×10 −1 M with a detection limit of 8×10 −8 M (signal-to-noise ratio = 3). Performance was improved to meet practical needs compared with previously reported analogues.