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Title: Ambient Gas-Particle Partitioning of Tracers for Biogenic Oxidation
Authors: Isaacman-VanWertz, Gabriel A.
Yee, Lindsay D.
Kreisberg, Nathan M.
Wernis, Rebecca A.
Moss, Joshua A.
Hering, Susanne V.
Sá, Suzane S. de
Martin, Scot T.
Alexander, Michael Lizabeth
Palm, Brett B.
Hu, Weiwei
Campuzano-Jost, Pedro
Day, Douglas A.
Ji?enez, José Luis
Riva, Matthieu
Surratt, Jason D.
Viegas, Juarez
Manzi, Antônio Ocimar
Edgerton, Eric S.
Baumann, Karsten
Souza, Rodrigo Augusto Ferreira de
Artaxo, Paulo
Goldstein, Allen H.
Keywords: Atmospheric Chemistry
Chemical Bonds
Organic Compounds
Environmental Factors
Equilibrium Partitioning Model
Gas-particle Partitioning
Gas-phase Concentration
Measurement Sites
Oxidation Products
Particle Fraction
Simultaneous Measurement
Ambient Air
Atmospheric Chemistry
Carbon Dioxide
Concentration (composition)
Environmental Factor
Particle Size
Vapor Pressure
United States
Organic Compound
Oxidation Reduction Reaction
Vapor Pressure
Organic Chemicals
Vapor Pressure
Issue Date: 2016
metadata.dc.publisher.journal: Environmental Science and Technology
metadata.dc.relation.ispartof: Volume 50, Número 18, Pags. 9952-9962
Abstract: 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 ∼25% across measurement sites. © 2016 American Chemical Society.
metadata.dc.identifier.doi: 10.1021/acs.est.6b01674
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