HR: 0830h
AN: A51F-0746    [PDF]
TI: Partitioning of organic aerosol components between gas phase and particulate phase
AU: Folkers, M
EM: m.folkers@fz-juelich.de
AF: ICG-II: Troposph\"are, Forschungszentrum J\"ulich, J\"ulich, 52425 Germany
AU: * Mentel, T F
EM: t.mentel@fz-juelich.de
AF: ICG-II: Troposph\"are, Forschungszentrum J\"ulich, J\"ulich, 52425 Germany
AU: Henk, H
EM: h.henk@fz-juelich.de
AF: ICG-II: Troposph\"are, Forschungszentrum J\"ulich, J\"ulich, 52425 Germany
AU: Tillmann, R
EM: r.tillmann@fz-juelich.de
AF: ICG-II: Troposph\"are, Forschungszentrum J\"ulich, J\"ulich, 52425 Germany
AU: Wahner, A
EM: a.wahner@fz-juelich.de
AF: ICG-II: Troposph\"are, Forschungszentrum J\"ulich, J\"ulich, 52425 Germany
AU: Otjes, R P
EM: otjes@ecn.nl
AF: Energy research Centre of the Netherlands, P.O.Box 1, Petten, ZG 1755 Netherlands
AU: Blom, M J
EM: m.blom@ecn.nl
AF: Energy research Centre of the Netherlands, P.O.Box 1, Petten, ZG 1755 Netherlands
AU: Ten Brink, H M
EM: tenbrink@ecn.nl
AF: Energy research Centre of the Netherlands, P.O.Box 1, Petten, ZG 1755 Netherlands
AB: To understand the role of organics in aerosols both the particulate composition and the gas/vapor phase composition must determined simultaneously. Ammonium sulfates and dicarboxylic acids are major components of continental, tropospheric aerosols. We performed two experiments in which we studied the partitioning of organic aerosol components between the gas and the particulate phase. As model systems we chose ($\rm NH_4HSO_4$\,+\, glutaric acid) aerosol and ($\rm(NH_4)HSO_4$\, +\,methyl glyoxal) aerosol (an oxidation product of isoprene). The experiment were performed in the large Aerosol Chamber at the FZ-J\"ulich at room temperature. The relative humidity was constantly increased in the course of the experiment (40\,$\rightarrow$\,90% r.h., 60\,$\rightarrow$\,90% r.h.).\newline % The particulate phase was characterized on line by SJAC/IC (Steam Jet Aerosol Collector/ Ion Chromatography, ECN) and an AMS (Aerosol Mass Spectrometer, Aerodyne). Simultaneously we measured the gas phase concentration of the organic component by a rotating wet denuder/TOC (Total Organic Carbon, ECN) and PTR-MS (Proton Transfer MS, Ionicon) and the $\rm NH_3$/$\rm NH_4^+$ concentration with an online monitor (AMANDA, ECN). Furthermore, the particle size distribution was measured by both an SMPS (TSI) and an APS (TSI3321). Temperature, pressure, and relative humidity were routinely recorded.\newline % The experimental observations will be interpretated based on results of thermodynamic model calculations. This model utilizes a combination of a Pitzer type model for the inorganic components and a UNIFAC model for the organic components.\newline % The studies are part of the EU project CASOMIO.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting