Molar Absorptivities of Ultraviolet and Visible Bands of Ozone in Aqueous Solutions

E.J. Hart, Knud Sehested, J. Holcman

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    Abstract

    The molar absorptivities of aqueous ozone solutions [.epsilon.(O3)] are reported for the wavelength ranges 190-300 nm and 350-900 nm. At the maxima of these bands, .epsilon.260(O3) = 3292 .+-. 70 M-1 cm-1 and .epsilon.590(O3) = 5.1 .+-. 0.1 M-1 cm-1. The analyses for ozone were carried out by absorbance measurements of the gas at 253.7 nm and by oxidation of FeSO4 in H2SO4 solution followed by back-titration of excess Fe2+ with KMnO4. Spectrophotometric analysis of Fe3+ was also used at low ozone concentrations. A stoichiometric ratio, Fe3+/O3, of 1.996 .+-. 0.036 was found. The visible spectrum of aqueous O3 is compared with that of ozone gas.
    Original languageEnglish
    JournalAnalytical Chemistry
    Volume55
    Issue number1
    Pages (from-to)46-49
    ISSN0003-2700
    DOIs
    Publication statusPublished - 1983

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