| Main Title |
Formation of photochemical aerosols / |
| Author |
Stephens, Edgar R. ;
Price., Monty A.
|
| Other Authors |
|
| CORP Author |
California Univ., Riverside. Statewide Air Pollution Research Center.;Environmental Sciences Research Lab., Research Triangle Park, N.C. Atmospheric Chemistry and Physics Div. |
| Publisher |
Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, |
| Year Published |
1977 |
| Report Number |
EPA-600/3-77-044; EPA-R-80068; PB268895 |
| Stock Number |
PB-268 895 |
| OCLC Number |
52420575 |
| Subjects |
Photochemical smog--California ;
Aerosols
|
| Additional Subjects |
Aerosols ;
Smog ;
Photochemical reactions ;
Sulfur oxides ;
Nitrogen oxides ;
California ;
Gas analysis ;
Chemical analysis ;
Particles ;
Infrared spectroscopy ;
Experiments ;
Concentration(Composition) ;
Gas generating systems ;
Design criteria ;
Laboratory equipment ;
Test chambers ;
Sampling ;
Environmental survey ;
Extraction ;
Organic compounds ;
Forecasting ;
Air pollution detection
|
| Internet Access |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| EJBD |
EPA 600-3-77-044 |
|
Headquarters Library/Washington,DC |
03/07/2014 |
| ELBD ARCHIVE |
EPA 600-3-77-044 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
| ESAD |
EPA 600-3-77-044 |
|
Region 10 Library/Seattle,WA |
03/23/2010 |
| NTIS |
PB-268 895 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
67 p. : ill. ; 28 cm. |
| Abstract |
The objective was to develop a better understanding of smog aerosol formation with particular reference to haze in the Southern California area. This study combined laboratory work with ambient air studies. Counting of particles by light scattering was the principle physical technique while infrared analyses was the major source of chemical information. A new reflectance spectroscopy technique was also developed. Infrared spectra of ambient aerosols have bands assigned to sulfate, nitrate, ammonium, and water which are completely removed by water washing of the sample but not by benzene. Synthetic aerosols generated by mixing ammonia with sulfuric and nitric acids produce similar spectra. Many ambient aerosol particles are hygroscopic or deliquescent so that they swell as the relative humidity increases and shrink as it decreases. This readily explains the heavy haze seen at high humidity days. A variety of reaction products (SO4(-2), NO3(-), organics) can potentially fulfill the requirement of water solubility and hygroscopicity to contribute to haze and loss of visibility. It is concluded that direct control of aerosol emissions will not markedly improve visibility in Southern California. |
| Notes |
"EPA-600/3-77-044." "May 1977." Includes bibliographical references (p. 64-66). |
