Ambient Gas-Particle Partitioning of Tracers for Biogenic Oxidation

作者：Isaacman VanWertz Gabriel; Yee Lindsay D; Krei**erg Nathan M; Wernis Rebecca; Moss Joshua A; Hering Susanne V; de Sa Suzane S; Martin Scot T; Alexander M Lizabeth; Palm Brett B; Hu Weiwei; Campuzano Jost Pedro; Day Douglas A; Jimenez Jose L; Riva Matthieu; Surratte Jason D; Viegas Juarez; Manzi Antonio; Edgerton Eric; Baumann Karsten; Souza Rodrigo; Artaxo Paulo; Goldstein Allen H

来源：Environmental Science & Technology, 2016, 50(18): 9952-9962.

DOI：10.1021/acs.est.6b01674

Exchange of atmospheric organic compounds between gas and particle phases is important in the production and chemistry of particle-phase mass but is poorly understood due to a lack of simultaneous measurements in both phases of individual compounds. Measurements of particle- and gas phase organic compounds are reported here for the southeastern United States and central Amazonia. Polyols formed from isoprene oxidation contribute 8% and 15% on average to particle-phase organic mass at these sites but are also observed to have substantial gas-phase concentrations contrary to many models that treat these compounds as nonvolatile. The results of the present study show that the gas-particle partitioning of approximately 100 known and newly observed oxidation products is not well explained by environmental factors (e.g., temperature). Compounds having high vapor pressures have higher particle fractions than expected from absorptive equilibrium partitioning models. These observations support the conclusion that many commonly measured biogenic oxidation products may be bound in low-volatility mass (e.g., accretion products, inorganic organic adducts) that decomposes to individual compounds on analysis. However, the nature and extent of any such bonding remains uncertain. Similar conclusions are reach for both study locations, and average particle fractions for a given compound are consistent within similar to 25% across measurement sites.

• 出版日期2016-9-20