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Environ Sci Process Impacts

Title:		Temperature dependence of the gas-particle partitioning of selected VOCs
Author(s):		Ahn J; Rao G; Vejerano E;
Address:		"Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, University of South Carolina, 921 Assembly St., PHRC 501D, Columbia, SC 29208, USA. vejerano@mailbox.sc.edu"
Journal Title:		Environ Sci Process Impacts
Year:		2021
Volume:		23
Issue:		7
Page Number:		947 - 955
DOI:		10.1039/d1em00176k
ISSN/ISBN:		2050-7895 (Electronic) 2050-7887 (Linking)
Abstract:		"The gas-particle partitioning coefficients for volatile organic compounds (VOCs) are difficult to acquire because discriminating the small mass fraction of the VOCs in the aerosol particle relative to that in the gas phase is challenging. In this paper, we report the temperature dependence of the gas-particle partitioning coefficient (Kp) for n-butanol (n-BuOH) and trichloroethylene (TCE). Using the bench-scale system that we developed, we measured the Kp of surrogate VOCs, n-BuOH, and TCE onto inorganic (ammonium sulfate, Am Sulf) and organic (succinic acid, SA) aerosol particles at a fixed relative humidity (RH) of 35%. At this RH level and temperature range of 278.15-308.15 K, the ln Kp for TCE and n-BuOH partitioning on SA aerosol particles were -27.0 +/- 0.70 to -27.9 +/- 0.01 and -13.9 +/- 0.03 to -17.4 +/- 0.17. In contrast, the ln Kp for TCE and n-BuOH partitioning on Am Sulf aerosol particles ranged from -26.4 +/- 0.70 to -27.4 +/- 0.71 and -14.1 +/- 0.03 to -17.1 +/- 0.17, respectively. Results showed that TCE fitted well with the classic van't Hoff relationship. The enthalpy of desorption (DeltaHdes) for TCE was constant over the temperature range of 278.15 K to 308.15 K, behaving similarly to 1,2-dichlorobenzene. At a similar temperature range, n-BuOH partitioning into both aerosol particles exhibited nonlinear temperature dependence. The minimum ratio of DeltaHdes (Am Sulf:SA) for n-BuOH partitioning on each aerosol type was at approximately 278.15 K. The magnitude of the entropy DeltaSdes for all VOCs was <1 kJ mol-1"
Keywords:		Aerosols Gases Temperature *Trichloroethylene *Volatile Organic Compounds;
Notes:		"MedlineAhn, Jeonghyeon Rao, Guiying Vejerano, Eric eng England 2021/06/09 Environ Sci Process Impacts. 2021 Jul 21; 23(7):947-955. doi: 10.1039/d1em00176k"