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Environ Sci Technol

Title:		Aerosol Chemistry Resolved by Mass Spectrometry: Insights into Particle Growth after Ambient New Particle Formation
Author(s):		Vogel AL; Schneider J; Muller-Tautges C; Klimach T; Hoffmann T;
Address:		"Institute for Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg-University Mainz , 55128 Mainz, Germany. Particle Chemistry Department, Max Planck Institute for Chemistry , 55128 Mainz, Germany"
Journal Title:		Environ Sci Technol
Year:		2016
Volume:		20161006
Issue:		20
Page Number:		10814 - 10822
DOI:		10.1021/acs.est.6b01673
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Atmospheric oxidation of volatile organic compounds (VOCs) yields a large number of different organic molecules which comprise a wide range of volatility. Depending on their volatility, they can be involved in new particle formation and particle growth, thus affecting the number concentration of cloud condensation nuclei in the atmosphere. Here, we identified oxidation products of VOCs in the particle phase during a field study at a rural mountaintop station in central Germany. We used atmospheric pressure chemical ionization mass spectrometry ((-)APCI-MS) and aerosol mass spectrometry for time-resolved measurements of organic species and of the total organic aerosol (OA) mass in the size range of 0.02-2.5 and 0.05-0.6 mum, respectively. The elemental composition of organic molecules was determined by offline analysis of colocated PM 2.5 filter samples using liquid chromatography coupled to electrospray ionization ultrahigh-resolution mass spectrometry. We found extremely low volatile organic compounds, likely from sesquiterpene oxidation, being the predominant signals in the (-)APCI-MS mass spectrum during new particle formation. Low volatile organic compounds started to dominate the spectrum when the newly formed particles were growing to larger diameters. Furthermore, the APCI-MS mass spectra pattern indicated that the average molecular weight of the OA fraction ranged between 270 and 340 amu, being inversely related to OA mass. Our observations can help further the understanding of which biogenic precursors and which chemical processes drive particle growth after atmospheric new-particle formation"
Keywords:
Notes:		"PubMed-not-MEDLINEVogel, Alexander L Schneider, Johannes Muller-Tautges, Christina Klimach, Thomas Hoffmann, Thorsten eng 2016/10/07 Environ Sci Technol. 2016 Oct 18; 50(20):10814-10822. doi: 10.1021/acs.est.6b01673. Epub 2016 Oct 6"