Journal Article

PreJuSER-20015

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Characterization of organic compounds in 10- to 50-nm aerosol particles in boreal forest with laser desorption -ionization aerosol mass spectrometer and comparison with other techniques

Laitinen, T. ; Ehn, M.FZJ* ; Junninen, H. ; Ruiz-Jimenez, J. ; Parshintsev, J. ; Hartonen, K. ; Riekkola, M.-L. ; Worsnop, D. R. ; Kulmala, M.

2011
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.atmosenv.2011.04.023

Abstract: The aim of this study was to characterize the organic composition of ambient ultrafine particles (< 50 nm) in a boreal forest environment and compare the analytical results obtained by different techniques with use a data analysis software. In the chromatographic techniques, particles were collected on a filter and analyzed off-line after sample preparation, whereas in the aerosol MS, particle analysis was performed directly from the particle source.Many compounds and chemical groups were identified with a laser aerosol mass spectrometer (laser AMS) and selected organic compounds, including acids, polyols, amines and aldehydes, from 50 nm filter samples were quantified. Interesting components found with the laser AMS included oxygenated and aliphatic hydrocarbons, aromatic compounds, amines, and black carbon. The amines found on laser AMS may be related to new particle formation events at particle sizes 10-25 nm. Correlations between the results obtained with different instruments were clarified, and the best correlations were found between laser AMS and 50-nm size filter samples. There were no correlations between the laser AMS data and meteorological data or on-line measured gas phase compounds. The black carbon found on laser AMS had moderate correlation for levoglucosan found on all-sized filter samples. Finally, the correlation analysis revealed that the information obtained from sub-50-nm size range particles and results for particles several times higher could not be directly compared. (C) 2011 Elsevier Ltd. All rights reserved.

Keyword(s): J ; Aerosols (auto) ; Nanoparticles (auto) ; Boreal forest (auto) ; Organic composition (auto) ; Aerosol MS (auto)

Note: The financial support of the Academy of Finland Centre of Excellence program (project no 1118615) is gratefully acknowledged. The authors thank Pekka Tarkiainen, Janne Levula, Toivo Pohja and all those at the SMEAR II station who helped with the measurements. Mikko Aijala is thanked for the Aerodyne AMS data handling and Sampsa Laine from Data Rangers for assistance in data analysis.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2011

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