Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-1361-2010 http://www.atmos-meas-tech-discuss.net/3/1361/2010/ http://www.atmos-meas-tech-discuss.net/3/1361/2010/amtd-3-1361-2010.html http://www.atmos-meas-tech-discuss.net/3/1361/2010/amtd-3-1361-2010.pdf 1361 1398 2010-03-31 A new aerosol collector for on-line analysis of particulate organic matter: the Aerosol Collection Module (ACM) T. Hohaus D. Trimborn A. Kiendler-Scharr a.kiendler-scharr@fz-juelich.de I. Gensch W. Laumer B. Kammer S. Andres H. Boudries K. A. Smith D. R. Worsnop J. T. Jayne Institut für Chemie und Dynamik der Geosphäre, ICG 2: Troposphäre, Forschungszentrum Jülich GmbH, Jülich, Germany Aerodyne Research Inc., Billerica, MA, USA Massachusetts Institute of Technology, Cambridge, MA, USA In many environments organic matter significantly contributes to the composition of atmospheric aerosol particles influencing its properties. Detailed chemical characterization of ambient aerosols is critical in order to understand the formation process, composition, and properties of aerosols in the atmosphere. However, current analytical methods are far from full speciation of organic aerosols and often require long sampling times. Offline methods are also subjected to artifacts during aerosol collection and storage. <br><br> In the present work a new technique for quasi-online compound specific measurements of organic aerosol particles was developed. The Aerosol Collection Module (ACM) is designed to sample, collect and transfer gasified atmospheric aerosol particles. The system focuses particles into a beam which is directed to a cooled sampling surface. The sampling takes places in a high vacuum environment where the gas phase from the sample volume is removed. After collection the particle sample is evaporated from the collection surface through heating and transferred to a detector. <br><br> For laboratory characterization the ACM was interfaced with a Gas Chromatograph Mass Spectrometer system (GC-MS). The particle collection efficiency, gas phase transfer efficiency, and linearity of the ACM-GC-MS were determined using laboratory generated octadecane aerosols. The ACM-GC-MS is linear over the investigated mass range of 10 to 100 ng and a recovery rate of 100% was found for octadecane particles. <br><br> The ACM-GC-MS was applied to investigate secondary organic aerosol (SOA) formed from β-pinene oxidation. Nopinone, myrtanal, myrtenol, 1-hydroxynopinone, 3-oxonopinone, 3,7-dihydroxynopinone, and bicyclo[3,1,1]hept-3-ene-2-one were found as products in the SOA. The ACM results are compared to quartz filter samples taken in parallel to the ACM measurements. First measurements of ambient atmospheric aerosols are presented. 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