Decomposition of ozone in water in the presence of organic solutes acting as promoters and inhibitors of radical chain reactions
The decomposition of aqueous ozone is generally due to a chain reaction involving .OH radicals. Many organic solutes (impurities) can react with .OH to yield .O/sub 2//sup -/ upon addition of O/sub 2/. .O/sub 2//sup -/ transfers its electron to a further ozone molecule in a rather selective reaction. The ozonide anion (.O/sub 3//sup -/) formed immediately decomposes into a further .OH radical. Compounds that convert .OH radicals into ozone-selective .O/sub 2//sup -/, therefore, act as promoters of the chain reaction. The efficiencies of different .OH to .O/sub 2//sup -/ converters (e.g., formic acid, primary and secondary alcohols (including sugars), glyoxylic acid, and humic acids) are tested in the presence of other .OH radical scavengers that do not primarily produce .O/sub 2//sup -/ (carbonate, aliphatic alkyl compounds, and tert-butyl alcohol). The derived reaction kinetics allows one to qualitatively interpret the variation of the lifetime of O/sub 3/ found in model solutions and even in natural waters and during drinking water treatment.
- Research Organization:
- Swiss Federal Institute for Water Resources and Water Pollution Control, Duebendorf
- OSTI ID:
- 5714843
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 19:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OZONE
DECOMPOSITION
SOLUTES
ORGANIC COMPOUNDS
ALCOHOLS
CHEMICAL REACTION KINETICS
FORMIC ACID
GLYOXYLIC ACID
HUMIC ACIDS
HYDROXYL RADICALS
WATER
WATER CHEMISTRY
WATER TREATMENT
ALDEHYDES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KINETICS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
OXYGEN COMPOUNDS
RADICALS
REACTION KINETICS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)