A carbon paste electrode bulk modified with MnO
investigated as an amperometric detector for hydrogen peroxide in flow
injection analysis (FIA). With an operating potential of +0.46 V
versus Ag/AgCl, H
oxidation currents which can be exploited for quantitative determinations.
Factors influencing the analytical performance of the electrode, such as
paste composition and pH, were studied both for batch voltammetry and for
FIA. For the flow system the influence of the injection volume and flow
rate were examined. The amperometric signals are linearly proportional to
concentrations in the range 0.5–350 mg
, showing a detection limit (three times
the signal-to-noise ratio) of 45 µg
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