Uptake of SO sub 2 (g) by aqueous surfaces as a function of pH: The effect of chemical reaction at the interface
- Boston College, Chestnut Hill, MA (USA)
- Aerodyne Research, Inc., Billerica, MA (USA)
The uptake of SO{sub 2}(g) by fast-moving water droplets was measured as a function of pH and surface-gas contact time in the range 0.5-10 ms. In the high pH range (> 5) a parameter governing the uptake of SO{sub 2}(g) by water is the rate for the reaction of SO{sub 2} with H{sub 2}O to form HSO{sub 3}{sup {minus}}. The experimentally observed uptake is significantly greater than predicted by the rate measured for this reaction in bulk liquid water. Likewise at low pH, where uptake is limited by Henry's law solubility, the uptake is significantly greater than predicted. These observations together with the observation of uptake as a function of time suggest that at the gas-liquid interface the SO{sub 2}-H{sub 2}O reaction is facile, forming a HSO{sub 3}{sup {minus}}-H{sup +} surface complex which is in equilibrium with the gas-phase SO{sub 2}.
- OSTI ID:
- 6418402
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN JPCHA; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
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Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ATMOSPHERIC CHEMISTRY
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
INTERFACES
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PH VALUE
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES