Abstract. The relevance of studying the optical properties of disinfectants by means of spectrophotometry is demonstrated. A block diagram of a spectrophotometer operating in the ultraviolet wavelength range is presented. The technical and operational characteristics of the spectrophotometer are given. Spectral dependences of the transmittance, T(λ), of aldehydes (formaldehyde, glutaraldehyde), alcohols (ethyl, isopropyl), peracetic acid, and hydrogen peroxide 30% are obtained. Spectral maxima of transparency in the short-wave region of the ultraviolet range, which occurred at λ = 230, 250, 285, 300, 330, 340 nm ("shoulders" in the T(λ) spectrum) are revealed. At the long-wave boundary of the operating spectral range (λ ≥ 400 nm), all the spectra are shown to converge monotonically with the account for the transmittance measurement error.

Keywords: spectrophotometer, transmission coefficient, disinfectant, radiation wavelength, spectrum, polychromator

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