Partitioning of Semivolatile Organic Compounds in the Presence of a Secondary Organic Aerosol in a Controlled Atmosphere |
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| Authors: | Keri B Leach Richard M Kamens Michael R Strommen Myoseon Jang |
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| Institution: | (1) Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, 27599–7400, U.S.A |
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| Abstract: | The gas-particle partitioning of select semivolatile organic compounds (SOCs) was studied by injecting the SOCs into a 190 m3 Teflon film chamber containing a secondary organic aerosol (SOA) generated by volatilizing liquid  -pinene into an ozone-concentrated atmosphere. The concentration of total suspended particulates (TSP) and gas and particle-phase SOCs was measured over the course of three experiments spanning a temperature range of 268–297 K and a relative humidity range of 55–100%. An equilibrium partition coefficient, Kp, was calculated for each sampling event. Empirical relationships were then developed to predict the partitioning of the SOCs on the SOA particle source as a function of temperature. Partitioning in this SOA system was compared to that of a SOA generated by the photochemical reaction of NOx with m-xylene. The results indicate that partitioning is similar between the two SOA systems. The effects of multiple particle sources on partitioning was also examined, revealing that a weighted average of predicted Kp values for individual sources can be used to predict partitioning in aerosol mixtures. |
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| Keywords: | gas-particle partitioning secondary organic aerosol  -pinene" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">-pinene ozone |
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