HR: 0800h
AN: A51A-0023    [Abstracts]
TI: Measurements of Gas and Particle Phase Emissions From Munitions Detonation in a Field Environment
AU: * Fortner, E C
EM: efortner@chemistry.montana.edu
AF: Montana State University, Department of Chemistry PO Box 173400, Bozeman, MT 59717-3400, United States
AU: Knighton, W B
EM: bknighton@chemistry.montana.edu
AF: Montana State University, Department of Chemistry PO Box 173400, Bozeman, MT 59717-3400, United States
AU: Timko, M
EM: timko@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976, United States
AU: Wood, E
EM: ezrawood@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976, United States
AU: Onasch, T B
EM: onasch@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976, United States
AU: Kolb, C E
EM: kolb@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976, United States
AU: Beardsley, H M
EM: beardsley_howard@bah.com
AF: Booz Allen Hamilton, 4692 Millenium Drive Suite 200, Belcamp, MD 21017-1535, United States
AB: During the Point of Fire (POF) field campaign conducted at Fort Sill Oklahoma U.S.A. in March 2007 a suite of real- time trace gas and fine (submicron) particulate matter (PM) instrumentation characterized the point of fire emission plumes from large, medium and small caliber weapons systems. Muzzle emission plumes were measured and where appropriate, breach plumes and gun crew breathing zone measurements were also conducted. Aerosol measurements were conducted with an aerosol mass spectrometer (Aerodyne CTOF-AMS) for particle composition, condensation particle counter (CPC) for particle number density and DUSTRAK aerosol monitor for particle mass. Gas phase measurements included CO, CO2, NOx and a variety of trace gas species measured by proton transfer reaction mass spectrometry (PTR-MS) including hydrogen cyanide (HCN), acetonitrile, acrylonitrile, benzene, toluene, benzonitrile and styrene. In the majority of the plume measurements, HCN was the most prominent compound measured by PTR-MS. Quantification of HCN by PTR-MS is difficult due to its proton affinity being close enough to that of water to allow a significant backward reaction of protonated HCN with water, reducing the detection sensitivity and making the response dependent on humidity. We have developed a quantification procedure for HCN based on laboratory measurements of a calibration gas standard of HCN, which allows the humidity dependence to be extracted directly from the proton hydrate ion intensities. The correction factors for HCN are quite significant varying between 10 and 30 depending on sample humidity.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting