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(A) Dose–response curve, Ipc vs. [KClO3]. Parameters: Scan rate = 100 mV/s; buffer = 100 μL of 50 mM sodium acetate adjusted to pH 2.5 with HCl; filter paper = 1 cm2 with 0.45 mg of [PMo11VO40]5−; electrodes = screen-printed carbon as working and counter with an Ag/AgCl screen-printed reference. (B) Cyclic voltammetry (CV) dose–response of the paper-based electrochemical probe as a function of the age of the filter paper containing the catalyst.
