Determination of Gaseous H2O2 Using UV-Vis Spectroscopy

The detection of gases and volatile compounds remains a significant analytical challenge, particularly in terms of sensitivity and selectivity. Many situations require rapid, sensitive, and yet easy-to-operate methods for detecting gaseous hydrogen peroxide (H2O2) under ambient conditions. In this study, we present two novel methodologies for the real-time monitoring of gaseous H2O2 based on colorimetric reactions, which are quantitatively analysed using UV-vis spectrometry. The proposed methods demonstrate high sensitivity in the low mg m−3 range, with a broad linear response within the tested concentration ranges of 0.4–17.6 mg m−3 and 10–90 mg m−3 after 20 min of accumulation under room-temperature conditions. The simplicity of the experimental setup, combined with robust analytical performance, highlights the potential applications of these methods in emerging fields such as clinical diagnostics, explosives detection, environmental monitoring, and occupational health and safety.