Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Spectrophotometric Method of Qualitative Rapid Analysis of Carbon Dioxide and Oxygen Content in a Chemosorbent Based on Potassium Peroxide T.A. CHUPAKHINA, P.V. BALABANOV, YU.YU. GROMOV The article is devoted to the development of a photometric method for the operational control of carbon dioxide and oxygen content in a chemosorbent based on potassium peroxide. Based on this, a decision is made on its suitability for use as part of insulating respiratory protection products. Using a hyperspectral camera, dependences of the spectral brightness of a granular chemosorbent in the visible and near-infrared ranges of 400–1000 nm were obtained. The correlation of the measured spectral brightness in the ranges of 460–470 nm, 935–945 nm, and 975–985 nm with the mass content of carbon dioxide and oxygen in the chemosorbent is proved. A mathematical model is proposed for classifying chemosorbent into categories suitable/unsuitable for use in respiratory protection products, which is a linear classification function, where spectral brightness at wavelengths of 465 nm, 940 nm, and 980 nm are used as predictors. A method of rapid monitoring of the chemosorbent's suitability for use has been developed, ensuring an accuracy of decision-making of at least 99 %. The advantage of the technique is its simplicity and relative cheapness of technical implementation, which makes it suitable for use in continuous non-destructive testing of chemosorbent in industrial conditions. Keywords: mathematical model, potassium peroxide, non-destructive testing, spectral brightness, spectrophotometric method, chemosorbent, rapid analysis. DOI: 10.25791/pribor.5.2026.1677 Pp. 59-66.