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https://doi.org/10.5194/amt-2017-147
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
09 May 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.
Estimation of the volatility distribution of organic aerosol combining thermodenuder and isothermal dilution measurements
Evangelos E. Louvaris1,2, Eleni Karnezi3, Evangelia Kostenidou2, Christos Kaltsonoudis2,3, and Spyros N. Pandis1,2,3 1Department of Chemical Engineering, University of Patras, Patras, Greece
2Institute of Chemical Engineering Sciences, FORTH/ICEHT, Patras, Greece
3Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, USA
Abstract. A method is developed for the determination of the organic aerosol (OA) volatility distribution combining thermodenuder and isothermal dilution measurements. The approach was tested in experiments that were conducted in a smog chamber using organic aerosol (OA) produced during meat charbroiling. A thermodenuder (TD) was operated at temperatures ranging from 25 to 250 °C with a 14 s centerline residence time coupled to a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and a Scanning Mobility Particle Sizer (SMPS). In parallel, a dilution chamber filled with clean air was used to dilute isothermally the aerosol of the larger chamber by approximately a factor of 10. The OA mass fraction remaining was measured as a function of temperature in the TD and as a function of time in the isothermal dilution chamber. These two sets of measurements were used together to estimate the volatility distribution of the OA and its effective vaporization enthalpy and accommodation coefficient. In the isothermal dilution experiments approximately 20 % of the OA evaporated within 15 min. Almost all the OA evaporated in the TD at approximately 200 °C. The resulting volatility distributions suggested that around 60–75 % of the cooking OA (COA) at concentrations around 500 μg m−3 consisted of low volatility organic compounds (LVOCs), 20–30 % of semi-volatile organic compounds (SVOCs) and around 10 % of intermediate volatility organic compounds (IVOCs). The estimated effective vaporization enthalpy of COA was 100 ± 20 kJ mol−1 and the effective accommodation coefficient was 0.06–0.07. Addition of the dilution measurements to the TD data results in a lower uncertainty of the estimated vaporization enthalpy as well as the SVOC content of the OA.

Citation: Louvaris, E. E., Karnezi, E., Kostenidou, E., Kaltsonoudis, C., and Pandis, S. N.: Estimation of the volatility distribution of organic aerosol combining thermodenuder and isothermal dilution measurements, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-147, in review, 2017.
Evangelos E. Louvaris et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Review of Louvaris et al.', Anonymous Referee #1, 13 Jun 2017 Printer-friendly Version 
AC1: 'Response to Referee #1', Spyros Pandis, 06 Aug 2017 Printer-friendly Version 
 
RC2: 'Comments on Louvaris et al', Anonymous Referee #2, 03 Jul 2017 Printer-friendly Version 
AC2: 'Response to Referee #2', Spyros Pandis, 06 Aug 2017 Printer-friendly Version 
Evangelos E. Louvaris et al.
Evangelos E. Louvaris et al.

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Short summary
A method is developed for the determination of the organic aerosol volatility distribution combining thermodenuder and isothermal dilution measurements. The approach was tested in experiments that were conducted in a smog chamber using organic aerosol produced during meat charbroiling. Addition of the dilution measurements to the thermodenuder data results in a lower uncertainty of the estimated vaporization enthalpy as well as the semivolatile content of the aerosol.
A method is developed for the determination of the organic aerosol volatility distribution...
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