Peroxypropionyl nitrate at a southern California mountain forest site
- DGA, Inc., Ventura, CA (United States)
Ambient levels of peroxyacetyl nitrate (PAN) and peroxypropionyl nitrate (PPN) have been measured at one mountain forest site, during the period August 8-October 16, 1989. Peroxy-n-butyryl nitrate (PnBN) was tentatively identified from a combination of laboratory experiments and field observations. Average concentrations during the study period were 2.9 ppb for PAN, 0.75 ppb for PPN, and 0.05 ppb for PnBN. Highest concentrations measured were >16 ppb for PAN, 5.1 pb for PPN, and 0.6 ppb for PnBN. Diurnal and seasonal variations are discussed in terms of horizontal transport of polluted air to the mountains, vertical transport reflecting inversion strength and mixing height, and a possible contribution of biogenic hydrocarbons. PPN/PAN concentrations ratios calculated from some 3,000 paired measurements were linearly correlated, i.e., PPN/PAN = 0.280 {plus minus} 0.001 (intercept ={minus}0.073 {plus minus} 0.002, R = 0.943). The PPN/PAN ratios are discussed in terms of formation and removal processes for PAN and PPN. Since PPN is 2-8 times more phytotoxic than PAN, PPN must be included in any realistic assessment of forest and crop damage by photochemical oxidants.
- OSTI ID:
- 5151397
- Journal Information:
- Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 25:4; ISSN ESTHA; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION ABATEMENT
AIR POLLUTION MONITORING
ATMOSPHERIC CHEMISTRY
CALIBRATION
CALIFORNIA
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
CROPS
DAILY VARIATIONS
DATA
DEVELOPED COUNTRIES
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
ESTERS
EXPERIMENTAL DATA
FORESTS
GAS CHROMATOGRAPHY
HYDROXYL RADICALS
INFORMATION
LEAST SQUARE FIT
MASS TRANSFER
MAXIMUM-LIKELIHOOD FIT
MONITORING
MOUNTAINS
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
NORTH AMERICA
NUMERICAL DATA
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDIZERS
OXYGEN COMPOUNDS
PEROXIDES
PEROXYACETYL NITRATE
POLLUTION ABATEMENT
QUANTITATIVE CHEMICAL ANALYSIS
RADICALS
SEASONAL VARIATIONS
SEPARATION PROCESSES
SYNTHESIS
USA
VARIATIONS