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STABILITY EVALUATION OF MULTICOMPONENT EPA PROTOCOL GASES
Citation:
Shores, R., M. Messner, R. Murdoch, E. Coppedge, T.J. Logan, AND M. Midgett. STABILITY EVALUATION OF MULTICOMPONENT EPA PROTOCOL GASES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/175.
Description:
Acid rain occurs when sulfur dioxide and nitrogen oxide emissions are transformed in the atmosphere and return to earth in rain, fog or snow. ost of the emissions are from the burning of fossil fuels by electric utilities. he electric utilities must reduce their emissions to comply with the new Clean Air Act Amendments of 1990. he utilities continuously monitor their emissions by using Continuous Emissions Monitors (CEMs). ompressed gas standards are used for calibration and audits of CEMS. he specialty gas manufacturers of these compressed gas standards must prepare the standards according to an EPA traceability protocol that was originally published in 1978. n accuracy assessment study of specialty gas manufacturers' protocol gases containing SO2 and NO was conducted in 1991. hese same cylinders have been reanalyzed to evaluate the stability of the protocol gases. his paper presents the results of the stability study of compressed gas cylinders over a two-year period. he protocol gases were found to be stable within +/-2% over that period.