Atmospheric H sub 2 O sub 2 field measurements in a tropical environment: Bahia, Brazil

Conference · Thu Sep 01 00:00:00 EDT 1988 · Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA)

OSTI ID:7070107

Jacob, P ^[1]; Tavares, T M; Rocha, V C ^[2]; Klockow, D ^[3]

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1. Institute fuer Spektrochemie und Angwandte Spektroscopie, Dortmund (West Germany)
2. Universidade Federal da Bahia (Brazil)
3. Universitaet Dortmund (West Germany)

Concentrations of H{sub 2}O{sub 2} in atmospheric gas and liquid phases were determined for the first time in the South Hemisphere. Measurements were taken in the Salvador area, Bahia, 13{degree}S, 38.3{degree}W, both at the seaside and 500m away from it, as well as at 270km inland, during March-April 1988. Gaseous samples were taken by cryogenic technique and rain by wet only collection. Analyses were performed by the peroxyoxalate chemiluminescence method. This methodology is the same used at Dortmund University and intercalibration was carried out allowing for unrestricted comparisons between previous results from Germany with present ones. Field measurements showed the following: a- H{sub 2}O{sub 2} absolute concentrations in the gas phase ranged from 200 ppt to 3.9 ppb, which is roughly five times that of Dortmund. b-Diurnal variation show maximum concentrations in early afternoon, somewhat earlier than the corresponding ones for Germany. Decreasing concentration during night in Bahia are most probably connected with condensation processes, for an increase in relative humidity reaching 100% is found in most cases at this time. c- H{sub 2}O{sub 2} in rain during daytime varied between 600-6770 ppbw, averaging 2337 ppbw, which is five times greater than daytime summer rain in Dortmund.

• OSTI ID: 7070107
• Report Number(s): CONF-8909232-; CODEN: ACWCA
• Journal Information: Preprints of Papers Presented at National Meeting, Division of Water, Air and Waste Chemistry, American Chemical Society; (USA), Vol. 28:2; Conference: 8. Japan - United States Governmental conference on solid waste management, Honolulu, HI (USA), 6-7 Sep 1989; ISSN 0099-7293
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
HYDROGEN PEROXIDE
AIR POLLUTION MONITORING
BRAZIL
CHEMILUMINESCENCE
COMPARATIVE EVALUATIONS
CRYOGENICS
DAILY VARIATIONS
ECOLOGICAL CONCENTRATION
FEDERAL REPUBLIC OF GERMANY
QUANTITY RATIO
TRACE AMOUNTS
TROPICAL REGIONS
DEVELOPING COUNTRIES
EUROPE
HYDROGEN COMPOUNDS
LATIN AMERICA
LUMINESCENCE
OXYGEN COMPOUNDS
PEROXIDES
SOUTH AMERICA
VARIATIONS
WESTERN EUROPE
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)