Electropolymerised thin films of (ANIH)5[PCu(H2O)W11O39](ANI).8H2O for the detection of iodate

Keggin-type polyoxometalate (POM) containing anilinium cation, (ANIH)5[PCu(H2O)W11O39](ANI).8H2O, has been synthesised and analysed using FT-IR and UV–vis spectroscopy. A thin film of (ANIH)5[PCu(H2O)W11O39](ANI).8H2O, shortly PANI/[PCu(H2O)W11O39], has been formed onto glassy carbon surfaces by electro polymerisation technique. The electrochemical behaviour of the modified electrode was investigated using various electrochemical methods, such as cyclic voltammetry and electrochemical impedance spectroscopy. Amperometric detection of iodate studies revealed that the PANI/[PCu(H2O)W11O39] modified electrode has two linear ranges of 2–20 μM and 40–2500 μM, as well as a limit of detection (LOD) and sensitivity of 0.8 μM (S/N = 3) and 0.347 μAcm−2/μM for the lower range and 1.7 μM (S/N = 3) and 0.014 μAcm−2/μM for the higher range respectively. In the presence of typical interfering analytes such as KH2PO4, KCl, NaClO3, NaNO3, Na2SO4, and NaClO4, the suggested electrochemical sensor exhibits significant catalytic activity. Moreover, the modified electrode showed excellent stability, rapid amperometric response (within 3 s), and the possibility of preparation of the electrode in a short period of time. Chemico-physical characterization of the target systems was performed scanning electron microscopy, Fourier transform infrared spectroscopy and UV–visible spectroscopy.