Record Display for the EPA National Library Catalog

RECORD NUMBER: 12 OF 20

OLS Field Name OLS Field Data
Main Title Pollutant Sampler for Measurements of Atmospheric Acidic Dry Deposition.
Author Knapp, K. T. ; Durham, J. L. ; Ellestad, T. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1986
Report Number EPA/600/J-86/382;
Stock Number PB87-209359
Additional Subjects Air pollution ; Gas sampling ; Particles ; Transition flow ; Air filters ; Reprints ; Acid deposition ; Air pollution sampling ; Air pollution monitors ; Particulate sampling
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB87-209359 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 7p
Abstract
An acidic pollutant sampler for dry deposition monitoring has been designed and evaluated in laboratory and field studies. The system, which is modular and simple to operate, samples gaseous HNO3, NH3, SO2 and NO2 and particulate SO4(-2), NO3(1-) and NH4(1+) and is made of Teflon to minimize trace reactive gas sorption. Particles greater than about 2 micrometers are removed with a cyclone. A transition-flow reactor (TFR) Teflon tube contains a Nylon liner for collection of a constant fraction of gaseous HNO3 and a Nafion liner for collection of a constant fraction of NH3. Excellent results were obtained in week-long runs with parallel sampling. In the first seven of these week-long runs the average difference between samples for gaseous HNO3 was 4.6% with a standard deviation of only 3.7. In the same sampling runs, the average difference for particulate sulfate was 3.0% with a standard deviation of only 1.4.