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Processing of atmospheric polycyclic aromatic hydrocarbons by fog in an urban environment
- Source :
- Journal of environmental monitoring : JEM. 14(10)
- Publication Year :
- 2012
-
Abstract
- Polycyclic aromatic hydrocarbons (PAH) are ubiquitous pollutants in the atmosphere, predominantly known for their toxicity. Although there has been substantial work on the atmospheric degradation of PAH, little is known about how the presence of atmospheric droplets (e.g., a fog cloud) affects the fate of PAH. In order to assess the processing of PAH and their corresponding oxidation products during a fog event, two field-sampling campaigns in Fresno, CA and Davis, CA were conducted. The simultaneous evaluation of concentrations of the PAH and oxygenated polycyclic aromatic compounds (OPAC) in the gas phase, particulate matter and fog water droplets before, during and after fog allows for the characterization of transformative and transport processes in a fog cloud. By tracking the ratio of OPAC to PAH in the individual atmospheric phases, two major polycyclic aromatic compounds-processing pathways can be identified: (i) the dissolution of OPAC from particulate matter and (ii) the uptake and oxidation of PAH in the fog water droplets. Wet deposition steadily decreases the pollutant concentration in the fog cloud droplets during a fog event; however, uptake and concentration via evaporative water loss upon the dissipation of a fog cloud cause an increase in the atmospheric pollutant concentration.
- Subjects :
- Pollutant
Air Pollutants
genetic structures
Atmosphere
Public Health, Environmental and Occupational Health
General Medicine
Management, Monitoring, Policy and Law
Particulates
complex mixtures
California
Gas phase
Environmental chemistry
Air Pollution
Cloud droplet
Environmental science
Cities
Polycyclic Aromatic Hydrocarbons
Dissolution
Weather
Urban environment
Environmental Monitoring
Subjects
Details
- ISSN :
- 14640333
- Volume :
- 14
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Journal of environmental monitoring : JEM
- Accession number :
- edsair.doi.dedup.....b1299e6a998faf83ad31073bad760591