The authors use cyclic voltammetry and amperometry to determine H2O2. However, these electrochemical techniques are not suitable, as they were used for quantification. The amperometry in a static form does not present much difference from the noise in the current with the additions in smaller concentrations. I recommend doing the amperometric analysis coupled with a flow injection analysis system or batch-injection analysis. These systems with amperometric detection will provide well-defined peaks, so you can clearly see the linear range of the developed method.

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