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Herein, we report the fabrication of electrochemical sensor for the detection of mercury Hg(II) ions using macroporous divinyl benzene immobilized on ion-exchange polymeric ionophore. Impedance spectroscopy was adopted to examine the performance of the fabricated sensor. Various experiments were done to get the optimized experimental conditions of the fabricated sensor. The fabricated sensor demonstrates a linear range of 10–8 to 10–5 M and low detection limit was about 10–4.8 M.