In this paper, an electrochemical free chlorine (FCL) sensor was formed by modifying a fluorine-doped tin oxide-coated glass slide (glass|FTO) with a layer of Prussian blue (glass|FTO|PB). The glass|FTO|PB sensor exhibited a wide linear detection range from 1.7 to 99.2 μmol L−1 of FCL with a sensitivity of ~0.8 µA cm−2 μmol−1 L and showed high selectivity for FCL. However, ClO3−, ClO4− and NO3− ions have induced only a negligible amperometric response that is highly beneficial for a real-life sample analysis as these ions are commonly found in chlorine-treated water. Moreover, in this work, optical absorption measurement-based investigations of partially reduced PB were carried out as a means to characterize PB catalytic activity towards FCL and to investigate the possibility of applying PB for the optical detection of FCL.
In this research a Hg 2 + ion biosensor was developed by combining Prussian blue (PB) with glucose oxidase (GOx) -an enzyme that can be inhibited by Hg 2 + ions. An application of PB in the design of Hg 2 + ion biosensor enabled detecting changes in hydrogen peroxide reduction current at low operational potential of 0.2 vs Ag j AgCl,KCl sat . The described Hg 2 + ion biosensor exhibited wide linear range from 27 μM to 247 μM of Hg 2 + and higher maximal detectable concentration of Hg 2 + than other GOx inhibition-based biosensors, making it convenient for the analysis of samples with high concentration of Hg 2 + ions.
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