A polyoxometalate(NH4)42[Mo132O372(CH3COO)30(H2O)72]was synthesized by electrochemical method.The polyoxometalate film was grown on a glassy carbon by the electrodepositing method.Its electrochemical behaviors were studied by cyclic voltammetry and amperometry.This film electrode exhibited a high catalytic activity for iodate reduction.By determining the steady-state current of iodate with constant potential amperometry,the optimal detection potential was obtained,which was-0.2V.Amperometry revealed a good linear relationship between peak current and the concentration of iodate in the range of 1 × 10-6 and 2 × 10-4 mol/L and the detection limit of 5 × 10-7 mol/L.The diffusion coefficient of 4.45 × 10-7 cm2/s for iodate was calculated.As a result,it is much promising for the polyoxometalate film modified electrode to be used as an electrochemical sensor for detecting the reduction of iodate.
