A reactive hydrocarbon analyzer (RHA), based on the chemiluminescent reaction of hydrocarbons with oxygen atoms, is used to provide a rapid indication of reactivity weighted hydrocarbon mass in automobile exhaust. Samples are reported by their ethylene-equivalent concentration--the concentration of ethylene which would give the same mass-reactivity product as the exhaust hydrocarbon mixture. These are compared to ethylene-equivalent concentrations obtained by the much more cumbersome procedure of weighting the individual sample hydrocarbons, determined by gas chromatography (GC), by their respective relative short-term photochemical reactivities, summing these results, and equating them to ethylene. Procedures are also described to eliminate a negative interference to the RHA method resultant from H2O quenching of the chemiluminescence emitter. The RHA and GC ethylene-equivalent concentrations correlate within 5%. (Copyright (c) 1977 by the American Chemical Society.)

  • Supplemental Notes:
    • Prepared in cooperation with AeroChem Research Labs., Inc., Princeton, N.J. Pub. in Environmental Science and Technology, v11 n6 p597-601 Jun 77.
  • Corporate Authors:

    Environmental Protection Agency

    Environmental Sciences Research Laboratory
    Research Triangle Pk, NC  United States 

    Aerochem Research Laboratories, Incorporated

    P.O. Box 12
    Princeton, NJ  United States  08540
  • Authors:
    • Black, F M
    • High, L E
    • Fontijn, A
  • Publication Date: 1977-1-7

Media Info

  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00175784
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA-600-J-77-080
  • Files: TRIS
  • Created Date: Jun 28 1978 12:00AM