Record Display for the EPA National Library Catalog


Main Title Stability Evaluation of Multicomponent EPA Protocol Gases.
Author Shores, R. C. ; Messner, M. J. ; Murdoch, R. W. ; Coppedge, E. A. ; Logan, T. J. ;
CORP Author Research Triangle Inst., Research Triangle Park, NC. Center for Environmental Measurements and Quality Assurance.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1994
Year Published 1994
Report Number EPA-68-D1-0009; EPA/600/A-94/175;
Stock Number PB95-124806
Additional Subjects Chemical stabilization ; Standards ; Air pollution monitoring ; Quality assurance ; US EPA ; Continuous sampling ; Calibrating ; Nitrogen oxide(NO) ; Sulfur dioxide ; Gas cylinders ; Assessments ; Protocol gases ; Standard reference materials
Library Call Number Additional Info Location Last
NTIS  PB95-124806 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
Acid rain occurs when sulfur dioxide and nitrogen oxide emissions are transformed in the atmosphere and return to earth in rain, fog or snow. Most of the emissions are from the burning of fossil fuels by electric utilities. The electric utilities must reduce their emissions to comply with the new Clean Air Act Amendments of 1990. The utilities continuously monitor their emissions by using Continuous Emissions Monitors (CEMs). Compressed gas standards are used for calibration and audits of CEMs. The specialty gas manufacturers of these compressed gas standards must prepare the standards according to an EPA traceability protocol that was originally published in 1978. An accuracy assessment study of specialty gas manufacturers' protocol gases containing SO2 and NO was conducted in 1991. These same cylinders have been reanalyzed to evaluate the stability of the protocol gases. The paper presents the results of the stability study of compressed gas cylinders over a two-year period. The protocol gases were found to be stable within + or - 2% over that period.