||Analysis of EPA (Environmental Protection Agency) Protocol Gases Used for Calibration and Audits of Continuous Emission Monitoring Systems and Ambient Air Analyzers - Results of Audit 6.
Wright, R. S. ;
Tew, E. L. ;
Decker, C. E. ;
von Lehmden, D. J. ;
||Research Triangle Inst., Research Triangle Park, NC.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Gas analysis ;
Performance evaluation ;
Sulfur dioxide ;
Carbon monoxide ;
Nitrogen oxide(NO) ;
Continuous emission monitoring systems ;
Air pollution detection
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A performance audit was conducted on EPA Protocol Gases used for calibration and audits of continuous emission monitoring systems and ambient air analyzers. Fifty gaseous pollutant calibraton standards were purchased from eleven specialty gas producers. These standards contained sulfur dioxide in nitrogen (70 and 300 ppm), nitric oxide in nitrogen (70 and 400 ppm), and carbon monoxide in air (30 ppm). Seventy percent of the producers' certified concentrations were accurate to within plus or minus 2 percent and 94 percent of the concentrations were accurate to within plus or minus 5 percent. These accuracies are significantly better than the accuracies obtained during a 1981 audit of commercial cylinder gases. In general, the lower concentration sulfur dioxide EPA Protocol Gases were less accurate than other EPA Protocol Gases. A secondary purpose of the audit was to examine the EPA Protocol Gases certificates of analysis for the inclusion of all data required by the protocol. In general, the producers supplied most of the information required on their certificates of analysis.