Pulse radiolytic study of the reaction OH + O/sub 3/ in aqueous medium
Journal Article
·
· J. Phys. Chem.; (United States)
In slightly alkaline solution the ozonide radical ion, O/sub 3//sup -/, forms as a product of the hydroxyl radical reaction with ozone. For each O/sub 3//sup -/ formed, two O/sub 3/ molecules are consumed. In acid solution the product of this reaction is the perhydroxyl radical, HO/sub 2/, formed from one O/sub 3/ molecule. Our results are consistent with the gas-phase reaction where the products are HO/sub 2/ and O/sub 2/. A rate constant of (1.1 +/- 0.2) x 10/sup 8/ dm/sup 3/ mol/sup -1/ s/sup -1/ is found for the reaction OH + O/sub 3/ ..-->.. HO/sub 2/ + O/sub 2/. This rate constant was obtained by three systems, by buildup of O/sub 3//sup -/ in basic solutions, by competition of the OH radical with the carbonate ion, and directly by O/sub 3/ consumption in acid solution. The rate constant for the reaction of HO/sub 2/ with O/sub 3/ is very low, < 10/sub 4/ dm/sup 3/ mol/sup -1/ s/sup -1/. At pH greater than or equal to 1, HO/sub 2/ reacts with O/sub 3/ preferentially in its dissociated form, O/sub 2//sup -/. No spectroscopic evidence has been found for the HO/sub 3/ and HO/sub 4/ free-radical intermediates. 24 references, 4 figures, 2 tables.
- Research Organization:
- Riso National Lab., Roskilde, Denmark
- OSTI ID:
- 6120762
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:18; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
ANIONS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DISPERSIONS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
IONS
KINETICS
MATHEMATICAL MODELS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PH VALUE
PULSES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
REACTION KINETICS
SOLUTIONS
SPECTRA
SPECTROSCOPY
YIELDS
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
ANIONS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DISPERSIONS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
IONS
KINETICS
MATHEMATICAL MODELS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PH VALUE
PULSES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
REACTION KINETICS
SOLUTIONS
SPECTRA
SPECTROSCOPY
YIELDS