Sulfur dioxide-hydrogen peroxide relationships in clean air, clouds, and precipitation

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5120686

Schwartz, S E; Daum, P H

In-cloud oxidation by H/sub 2/O/sub 2/ is a major route for conversion of atmospheric SO/sub 2/ to sulfate, as indicated by kinetic calculations for representative H/sub 2/O/sub 2/ concentrations and supported by the observation of mutual exclusivity of gaseous SO/sub 2/ and aqueous H/sub 2/O/sub 2/ in non-precipitating liquid-water stratiform clouds, which generally persist sufficiently for reaction to proceed to completion. Measurements reported here indicate the aqueous S(IV) and H/sub 2/O/sub 2/ are also mutually exclusive in surface precipitation samples, but that SO/sub 2/ and aqueous H/sub 2/O/sub 2/ often coexist in precipitating clouds. Gaseous SO/sub 2/ and H/sub 2/O/sub 2/ are also commonly simultaneously present in clear air; in the mixed layer either species maybe in excess, but H/sub 2/O/sub 2/ present with SO/sub 2/ in precipitating clouds is attributed to material dissolved in falling hydrometeors which has not had time to react with SO/sub 2/. This supported by model calculations evaluating the characteristic time and distance for reaction of aqueous H/sub 2/O/sub 2/ in droplets falling through an SO/sub 2/-containing layer. 29 refs., 6 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5120686
• Report Number(s): BNL-40755; CONF-880604-4; ON: DE88006352
• Resource Relation: Conference: Joint meeting of the 195th national meeting of the American Chemical Society and the 3rd Chemical Congress of North America, Toronto, Canada, 5 Jun 1988
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
HYDROGEN PEROXIDE
ATMOSPHERIC CHEMISTRY
SULFATES
WASHOUT
SULFUR DIOXIDE
ACID RAIN
ATMOSPHERIC PRECIPITATIONS
CHEMICAL REACTION KINETICS
CLOUDS
MATHEMATICAL MODELS
OHIO
CHALCOGENIDES
CHEMISTRY
FEDERAL REGION V
HYDROGEN COMPOUNDS
KINETICS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PRECIPITATION SCAVENGING
RAIN
REACTION KINETICS
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR OXIDES
USA
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)