Determination of Hydrogen Peroxide in Rainwater by Using a Polyaniline Film and Platinum Particles Co-Modified Carbon Fiber Microelectrode

Four types of carbon fiber microelctrodes modified with polyaniline (PAn) and platinum particles (Pt) were fabricated to determine H2O2 at + 0.60 V (vs. SCE). The sensitivity, stability and selectivity of different electrodes were compared. The electrode modified with a sandwich film of PAn-Pt-PAn offered the best result. The linear range was 4.0 × 10−7–2.4 × 10−4 M with a detection limit of 1.0 × 10−7 M. The relative standard deviation (RSD) for 10 μM H2O2 was 1.9 % (n =7). The electrode was used to determine the H2O2 in the rainwater.