Volatility parameters of secondary organic aerosol components determined using a thermal denuder. (1st April 2020)

• Record Type: Journal Article
• Authors: Babar, Zaeem Bin; Ashraf, Fawad; Park, Jun-Hyun; Lim, Ho-Jin
• Is Part Of: Atmospheric environment. Volume 226(2020)
• Publication Date: 2020-04-01
• Subjects: Thermal denuder -- Volatility -- Saturation pressure -- Enthalpy of vaporization -- Secondary organic aerosol (SOA); Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2020.117405
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: In this study, the characterization of a new thermal denuder and its application to determine the volatility parameters of important components of secondary organic aerosol (SOA) are presented in detail. The temperature ramping rate to achieve a set value was ~14.3 °C min −1 in the range of 25–150 °C. Particle loss during the penetration through the denuder was negligible in the temperature and effective residence time (RT) ranges of 25 °C–60 °C and 12.5 s–50 s, respectively. In addition, a vapor-phase aerosol reached equilibrium with the gas phase at an effective RT of approximately 24 s. Furthermore, volatility profile data generated using the thermal denuder with the help of a scanning particle sizer were used to determine the saturation pressure (P 0 sat ) at 25 °C and enthalpy of vaporization (ΔHv ) of typical biogenic and anthropogenic SOA components by the integrated volume method. Determined ΔHv and P 0 sat values for succinic acid, adipic acid, pimelic acid, phthalic acid, pinic acid, and ketopinic acid were 86.6 ± 2.5 kJ mol −1, 146.1 kJ mol −1, 139.2 kJ mol −1, 135.9 kJ mol −1, 93.8 ± 1.8 kJ mol −1, and 136.6 kJ mol −1 and 4.70 ± 0.7 x 10 −5 Pa, 1.98 x 10 −5 Pa, 8.91 x 10 −5 Pa, 8.50 x 10 −5 Pa, 1.61 ± 0.5 x 10 −4 Pa, and 5.81 x 10 −5 Pa, respectively. These values were comparable with the literature data. Graphical abstract: Image 1 Highlights: A newly developed thermal denuder showed a uniform temperature profile. Equilibrium in thermal denuder was verified numerically and experimentally. Volatility profile data of single organic aerosols were generated. For organic aerosols P 0 sat and ΔHv were estimated using integral volume method. P 0 sat and ΔHv values of organic species were comparable to literature data.