HR: 1340h
AN: A33B-1187    [Abstracts]
TI: Development and use of Negative Ion Proton Transfer Reaction Chemical Ionization Mass Spectrometry (NI-PTR-CIMS) for the Measurement of Trace Organic Acids in the Atmosphere
AU: * Veres, P
EM: Patrick.Veres@noaa.gov
AF: Department of Chemistry and Biochemistry, University of Colorado, UCB 215, Boulder, CO 80309,
AU: * Veres, P
EM: Patrick.Veres@noaa.gov
AF: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway CSD7, Boulder, CO 80305,
AU: Roberts, J M
EM: James.M.Roberts@noaa.gov
AF: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway CSD7, Boulder, CO 80305,
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway CSD7, Boulder, CO 80305,
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, UCB 216, Boulder, CO 80309,
AU: de Gouw, J
EM: Joost.deGouw@noaa.gov
AF: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway CSD7, Boulder, CO 80305,
AU: de Gouw, J
EM: Joost.deGouw@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, UCB 216, Boulder, CO 80309,
AU: Herndon, S
EM: Herndon@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976,
AU: Zahniser, M
EM: mz@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821-3976,
AB: Negative-Ion Proton-Transfer Reaction Chemical Ionization Mass Spectrometry (NI-PTR-CIMS) has been developed for real-time measurement of gas-phase organic acids in the atmosphere. The method is based on the non-dissociative proton transfer reactions of CH₃COO^- with most of the common organic acids. The potential to detect organic acids (monocarboxylic, dicarboxylic, inorganic, and rare acids) has been shown by a number of laboratory investigations. The sensitivity of the instrument to several organic acids has been observed to be on the order of several ion counts per pptv. Detection limits well below the ppbv level are expected for a 1-second integration time. Various instrumental features including zeroing, time response, calibration and validation of the ion chemistry have been investigated and will be discussed. Intercomparison of formic acid measurements with Proton Transfer Reaction Mass Spectrometry (PTR-MS) and Quantum Cascade Laser IR absorption (QCL) serve to validate this measurement technique. Further development of this instrument will provide a fast, sensitive, and selective measurement technique for gas-phase acids. NI-PTR-CIMS has great potential for use in atmospheric chemistry field studies.
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting