HR: 1340h
AN: A53C-0912    [Abstracts]
TI: First deployment of a newly developed PIT-MS instrument for VOC measurements: Results from the ITCT-NEAQS 2004 experiment and comparison with GC-MS
AU: * Warneke, C
EM: carsten.Warneke@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: * Warneke, C
EM: carsten.Warneke@noaa.gov
AF: CIRES University of Colorado, 216 UCB, Boulder, CO 80309 United States
AU: Kato, S
EM: Shuji.Kato@Colorado.EDU
AF: CIRES University of Colorado, 216 UCB, Boulder, CO 80309 United States
AU: de Gouw, J A
EM: jdegouw@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: de Gouw, J A
EM: jdegouw@al.noaa.gov
AF: CIRES University of Colorado, 216 UCB, Boulder, CO 80309 United States
AU: Goldan, P D
EM: pgoldan@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Kuster, W C
EM: bkuster@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Shao, M
EM: Shao.Min@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Shao, M
EM: Shao.Min@noaa.gov
AF: Peking University, College of Environmental Science, Beijing, 100871 China
AU: Lovejoy, E R
EM: Edward.R.Lovejoy@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Fall, R
EM: fall@cires.colorado.edu
AF: CIRES University of Colorado, 216 UCB, Boulder, CO 80309 United States
AU: Fehsenfeld, F C
EM: fcf@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Fehsenfeld, F C
EM: fcf@al.noaa.gov
AF: CIRES University of Colorado, 216 UCB, Boulder, CO 80309 United States
AB: Volatile organic compounds (VOCs) were measured during the Intercontinental Transport and Chemical Transformation - New England Air Quality Study (ITCT-NEAQS 2004) in July-August 2004 with a newly developed PIT-MS (Proton Transfer Ion Trap - Mass Spectrometry) instrument for the first time during a field experiment. The instrument is based on the principle of PTR-MS (proton-transfer-reaction mass spectrometry): VOCs are ionized using proton transfer reactions and detected with a mass spectrometer. As opposed to a quadrupole mass filter in PTR-MS, the PIT-MS instrument uses an ion trap mass spectrometer, which has the following advantages. First, an ion trap has extended analytical capabilities of identifying VOCs by performing collision-induced dissociation (CID) and ion molecule reactions. Second, the ion trap has a nearly 100% duty cycle for a full mass spectrum, whereas a quadrupole transmits only ions of one mass at a time. Here, the results obtained in the marine boundary layer downwind of New York, Boston, and forested areas by PIT-MS are compared with GC-MS (gas chromatography/mass spectrometry) measurements of many hydrocarbons, including oxygenated, and with GC-ECD (gas chromatography/electron capture detection) measurements of peroxyacetyl nitrates (PANs). The PIT-MS instrument described had, during the experiment, a detection limit of <300 pptv for 1-min measurements for all measured VOCs. Furthermore we explore how the analytical capabilities of the PIT-MS instrument can be used to identify VOCs that are indistinguishable by PTR-MS.
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting