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A novel method for on-line analysis of gas and particle composition: description and evaluation of a Filter Inlet for Gases and AEROsols (FIGAERO)

Journal article
Authors F. D. Lopez-Hilfiker
C. Mohr
M. Ehn
F. Rubach
E. Kleist
J. Wildt
T. F. Mentel
Anna Lutz
Mattias Hallquist
D. Worsnop
J. A. Thornton
Published in Atmospheric Measurement Techniques Discussions
Volume 6
Issue 5
Pages 9347-9395
ISSN 1867-8610
Publisher Copernicus Publications
Publication year 2013
Published at Department of Chemistry and Molecular Biology
Pages 9347-9395
Language en
Links dx.doi.org/10.5194/amtd-6-9347-2013
https://gup.ub.gu.se/file/146243
Subject categories Chemical Sciences, Analytical Chemistry, Physical Chemistry, Organic Chemistry, Climate Research, Environmental Sciences, Environmental chemistry, Meteorology and Atmospheric Sciences

Abstract

We describe a novel inlet that allows measurement of both gas and particle molecular composition when coupled to mass spectrometric, chromatographic, or optical sensors: the Filter Inlet for Gas and AEROsol (FIGAERO). The design goals for the FIGAERO are to allow unperturbed observation of ambient air while simultaneously analyzing gases and collecting particulate matter on a Teflon filter via an entirely separate sampling port. The filter is analyzed periodically by the same sensor on hourly or faster timescales using temperature-programmed thermal desorption. We assess the performance of the FIGAERO by coupling it to a high-resolution time-of-flight chemical-ionization mass spectrometer (HRToF-CIMS) in laboratory chamber studies of α-pinene oxidation and field measurements at a boreal forest location. Low instrument backgrounds give detection limits of ppt or lower for compounds in the gas-phase and in the pg m−3 range for particle phase compounds. The FIGAERO-HRToF-CIMS provides molecular information about both gases and particle composition on the 1 Hz and hourly timescales, respectively for hundreds of compounds. The FIGAERO thermal desorptions are highly reproducible (better than 10%), allowing a calibrated assessment of the effective volatility of desorbing compounds and the role of thermal decomposition during the desorption process. We show that the often multi-modal desorption thermograms arising from secondary organic aerosol (SOA) provide additional insights into molecular composition and/or particle morphology, and exhibit changes with changes in SOA formation or aging pathways.

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