HR: 1330h
AN: A42A-0742    [PDF]
TI: Fast GC-Luminol Instrument for PAN and Nitrogen Dioxide Measurements
AU: * Marley, N A
EM: marley@anl.gov
AF: Argonne National Laboratory, Bldg. 203/ER, Argonne, IL 60439 United States
AU: Gaffney, J S
EM: gaffney@anl.gov
AF: Argonne National Laboratory, Bldg. 203/ER, Argonne, IL 60439 United States
AB: Fast gas chromatography (GC) with luminol detection was used to determine nitrogen dioxide and peroxyacetyl nitrate (PAN) levels onboard the National Oceanic and Atmospheric Administration Twin Otter during the Bay Region Atmospheric Chemistry Experiment (BRACE) in Tampa, Florida, in May 2002. Nitrogen dioxide concentrations measured by the fast GC-luminol technique were compared with simultaneous onboard NO2 determinations made by photolytic conversion to NO with subsequent ozone chemiluminescence detection. Use of photon counting (Hamamatsu HC-135) and an automated gas sampling valve enabled PAN measurement at 30-sec intervals. The fast GC-luminol system with photon counting will be described briefly. We recently improved the instrument and modified the outflow of the luminol carrier gas to minimize luminol spillage. Results will be presented for PAN during BRACE, and calibration data will be shown for the latest version of the instrument. The potential for luminol modification to improve sensitivity to PAN will also be discussed. This work was supported by the U.S. Department of Energy's Atmospheric Science Program.
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting