Main Title |
Hazardous air pollutants : dry-deposition phenomena / |
Author |
Sehmel, G. A. ;
Lee, R. N. ;
Horst, T. W.
|
Other Authors |
|
CORP Author |
Battelle Pacific Northwest Labs., Richland, WA.;Environmental Sciences Research Lab., Research Triangle Park, NC. Atmospheric Chemistry and Physics Div. |
Publisher |
GPO, |
Year Published |
1984 |
Report Number |
EPA/600/3-84/114 |
Stock Number |
PB85-138279 |
Subjects |
Air--Pollution--United States ;
Gases, Asphyxiating and poisonous
|
Additional Subjects |
Hazardous materials ;
Air pollution ;
Construction materials ;
Sulfur hexafluoride ;
Concentration(Composition) ;
Test chambers ;
Sampling ;
Transport properties ;
Substrates ;
Benzene/nitro ;
Ethylene/perchloro ;
Tracer studies ;
Dry deposition
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB85-138279 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
80 pages : illustrations |
Abstract |
Dry-deposition rates were evaluated for two hazardous organic air pollutants, nitrobenzene and perchloroethylene, to determine their potential for removal from the atmosphere to three building material surfaces, cement, tar paper, and vinyl asbestos tile. Dry-deposition experiments were conducted in two stirred chambers. Building materials were placed on the bottom of the stirred chambers, and removal rates were evaluated by introducing the organic air pollutant along with nondepositing sulfur hexafluoride (SF6) tracer gas into a stirred chamber. Changes in airborne concentrations with time were then monitored. Because the HAP removal rates were small, sulfur hexafluoride tracer gas was used to evaluate the rates of leakage from the SC in order to correct the deposition rates. When HAP wall losses were assumed negligible, HAP concentration decreases (corrected using the SF6 leakage rate) ranged from near 0 to 3 %/h. Dry-deposition velocities were calculated from the rate-of-change over time of the airborne concentrations. The calculated deposition velocities were consistently small, approximately .0001 cm/sec or less. These deposition velocities reflect mostly substrate resistance, but the fan speed could not be increased sufficiently to ensure in the limit that only substrate resistance was measured. |
Notes |
Caption title. "Dec. 1984." "EPA-600/3-84-114." Microfiche. |
Place Published |
Washington, D.C. : GPO, |
Corporate Au Added Ent |
Atmospheric Sciences Research Laboratory. ; Pacific Northwest Laboratory. |
PUB Date Free Form |
1985. |
NTIS Prices |
PC A05/MF A01 |
BIB Level |
m |
Medium |
microform |
Cataloging Source |
OCLC/T |
OCLC Time Stamp |
20011107180938 |
Language |
eng |
Origin |
NTIS |
Type |
MERGE |
OCLC Rec Leader |
01071cam 2200325Ka 45170 |