Abstract
This paper presents a detailed study of a novel type of electrochemical mercury ion (Hg2+) biosensor developed by combining Prussian blue (PB) and catalase (Cat). The simultaneous PB-catalyzed reduction of hydrogen peroxide and the inhibition of catalase by Hg2+ ions were used as the working principle of the biosensor. The biosensor described in this research was capable of detecting Hg2+ ions at relatively low potentials (+0.2 V vs. Ag|AgCl, KClsat) using chronoamperometry and a fast Fourier transform electrochemical impedance spectroscopy (FFT-EIS). Linear ranges of 0.07 mM–3 mM and 0.13 mM–0.80 mM of Hg2+ ions were obtained using amperometric and impedimetric techniques, respectively. In the course of this work, an amperometric study of the Hg2+ ion biosensor was also carried out on a real sample (tap water containing Hg2+ ions).
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