Record Display for the EPA National Library Catalog

RECORD NUMBER: 439 OF 1380

Main Title Determination of the Strong Acidity of Atmospheric Fine-Particles (<2.5 mum) Using Annular Denuder Technology. Standard Method, Enhanced Method.
Author Purdue, L. J. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Nov 92
Year Published 1992
Report Number EPA/600/R-93/037;
Stock Number PB93-178234
Additional Subjects Acidity ; Air pollution monitors ; Fines ; Aerosols ; Particles ; Filters ; Atmospheric composition ; Quality control ; Performance evaluation ; Annular denuders
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100TPB9.PDF
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
NTIS  PB93-178234 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 135p
Abstract
The report is a standardized methodology description for the determination of strong acidity of fine particles (less than 2.5 micrometers) in ambient air using annular denuder technology. The methodology description includes two parts: Part A - Standard Method and Part B - Enhanced Method. The Standard Method utilizes a denuder for removing ammonia and a filter assembly for determination of atmospheric strong acidity fine particle aerosols in ambient air, but does not account for potential interferences from nitric acid, ammonium nitrate aerosol or other ammonium salts which might bias the acidity measurement. The Enhanced Method adds an additional denuder upstream of the filter assembly to selectively remove acid gases (nitric acid vapors, nitrous acid and sulfur dioxide) from the gas stream prior to filtration. In addition, backup nylon and citric acid impregnated filters are used to correct for biases due to the dissociation of ammonium nitrate aerosol.