Aqueous-phase photochemical formation of peroxides in authentic cloud and fog waters
- Duke Univ., Durham, NC (United States)
Gas-to-drop partitioning of hydrogen peroxide and its precursor, the hydroperoxyl radical (HO[sup [sm bullet]][sub 2]), has been considered the predominant or sole source of hydrogen peroxide in atmospheric water drops. However, atmospheric water can absorb solar ultraviolet radiation, which initiates the photoformation of peroxides (primarily hydrogen peroxide). Measurements of peroxide photoformation rates in authentic atmospheric water samples demonstrate that aqueous-phase photochemical reactions are a significant, and in some cases dominant, source of hydrogen peroxide to cloud and fog drops. This additional source could significantly change the current understanding, and hence, the models, of sulfuric acid deposition because hydrogen peroxide is the limiting reagent in the dominant pathway for the oxidation of sulfur dioxide to sulfuric acid in the troposphere over eastern North America.
- OSTI ID:
- 6533269
- Journal Information:
- Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 260:5104; ISSN SCIEAS; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ATMOSPHERIC CHEMISTRY
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
ELEMENTS
FOG
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
IONS
IRON IONS
MATTER
METALS
ORGANIC COMPOUNDS
ORGANIC MATTER
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PHOTOCHEMICAL OXIDANTS
PHOTOCHEMICAL REACTIONS
RAIN
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
SYNTHESIS
TRANSITION ELEMENTS
WATER