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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2018-255
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-255
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Aug 2018

Research article | 16 Aug 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

A method for extracting calibrated volatility information from the FIGAERO-HR-ToF-CIMS and its application to chamber and field studies

Thomas J. Bannan1, Michael Le Breton2, Michael Priestley1, Stephen D. Worrall1,b, Asan Bacak1, Nicholas A. Marsden1, Archit Merha1, Julia Hammes2, Mattias Hallquist2, M. Rami Alfarra1,3, Ulrich K. Krieger4, Jonathan P. Reid5, John Jayne6, Wade Robinson6, Gordon McFiggans1, Hugh Coe1, Carl J. Percival1,a, and Dave Topping1 Thomas J. Bannan et al.
  • 1Centre for Atmospheric Science, School of Earth and Environmental Science, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
  • 2Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
  • 3National Centre for Atmosphere Science, UK
  • 4Institute for Atmospheric and Cl imate Science, ETH Zürich, 8092 Zürich, Switzerland
  • 5School of Chemistry, University of Bristol, Cantock's Close, Clifton, Bristol BS8 1TS
  • 6Aerodyne Research, Inc. 45 Manning Road, Billerica, MA 01821 USA
  • aCurrent address: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109
  • bCurrent address: School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK

Abstract. The Filter Inlet for Gases and AEROsols (FIGAERO) is an inlet specifically designed to be coupled with the Aerodyne High Resolution (HR)-Time of flight (ToF)-Chemical ionisation mass spectrometer (CIMS). The FIGAERO-HR-ToF-CIMS provides simultaneous molecular information relating to both the gas and particle phase samples and has been used to extract vapour pressures of the compounds desorbing from the filter, whilst giving quantitative concentrations in the particle phase. However, such extraction of vapour pressures of the measured particle phase components requires use of appropriate, well-defined, reference compounds. Vapour pressures for the homologous series of polyethylene glycols (PEG) ((H−(O−CH2−CH2)n−OH) for n=3 to n=8), covering a range of vapour pressures (VP) (10−1 to 10−7Pa) that are atmospherically relevant have been shown to be reproduced well by a range of different techniques, including Knudsen Effusion Mass Spectrometry (KEMS). This is the first homologous series of compounds for which a number of vapour pressure measurement techniques have been found to be in agreement, indicating the utility as a calibration standard, providing an ideal set of benchmark compounds for accurate characterisation of the FIGAERO for extracting vapour pressure of measured compounds in chambers and the real atmosphere. To demonstrate this, single component and mixture vapour pressure measurements are made using two FIGAERO-HR-ToF-CIMS instruments based on a new calibration determined from the PEG series. VP values extracted from both instruments agree well with those measured by KEMS and reported values from literature, validating this approach for extracting VP data from the FIGAERO. This method is then applied to chamber measurements and the vapour pressures of known products are estimated.

Thomas J. Bannan et al.
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Thomas J. Bannan et al.
Thomas J. Bannan et al.
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The Filter Inlet for Gases and AEROsols (FIGAERO) is an inlet designed to be coupled with a High Resolution (HR)-Time of flight (ToF)-Chemical ionisation mass spectrometer (CIMS) and provides simultaneous molecular information relating to both the gas and particle phase samples. This method has been used to extract vapour pressures of compounds, whilst giving quantitative concentrations in the particle phase. Here we detail an ideal set of benchmark compounds for characterisation of the FIGAERO.
The Filter Inlet for Gases and AEROsols (FIGAERO) is an inlet designed to be coupled with a High...
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