||Second performance audit of inspection and maintenance calibration gases /
Wright, R. S. ;
Moore, C. E. ;
Decker, C. E. ;
Barnard, W. F.
||Research Triangle Inst., Research Triangle Park, NC.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
|| U.S. Environmental Protection Agency, Office of Research and Development,
Motor vehicles--Motors--Exhaust gas--Measurement. ;
Carbon dioxide ;
Infrared detection ;
Gas chromatography ;
Carbon monoxide ;
State government ;
Local government ;
Clean Air Amendments of 1977
||NVFEL Library/Ann Arbor, MI
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||12 pages ; 28 cm
The purpose of the audit was to determine the accuracy of calibration gases being used by state and local inspection and maintenance (I/M) programs. Forty-six calibration gas cylinders were borrowed from 16 representative I/M programs. Typically, they contained propane (or hexane), carbon monoxide, and carbon dioxide in nitrogen. Research Triangle Institute (RTI) analyzed these calibration gases using nondispersive infrared photometry and gas chromatography with flame ionization and thermal conductivity detectors.
"March 1987." Includes bibliographical references.