title: Indoor secondary organic aerosol formation initiated from reactions between ozone and surface-sorbed D-limonene.
abstract: Reactions between ozone and terpenoids produce numerous products, some of which may form secondary organic aerosol (SOA). This work investigated the contribution to gas-phase SOA formation of ozone reactions with surface-sorbed D-limonene, which is common indoors. A model framework was developed to predict SOA mass formation because of ozone/terpenoid surface reactions, and it was used with steady state experiments in a 283 L chamber to determine the aerosol mass fraction of SOA resulting from surface reactions, ξs (the ratio of mass of SOA formed and mass of ozone consumed by ozone/terpenoid surface reactions), for ozone/D-limonene reactions on stainless steel. The ξs = 0.70-0.91, with lower relative humidity leading to both higher mass and number formation. Also, surface reactions promoted nucleation more than gas-phase reactions, and number formation due to surface reactions and gas-phase reactions were 126-339 and 51.1-60.2 no./cm(3) per μg/m(3) of formed SOA, respectively. We also used the model framework to predict that indoor spaces in which ozone/D-limonene surface reactions would likely lead to meaningful gas-phase SOA formation are those with surfaces that have low original reactivity with ozone, such as glass, sealed materials, or smooth metals.
authors.affiliation: Department of Civil, Architectural and Environmental Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, United States. msw59@drexel.edu
authors.forename: Michael S
authors.initials: MS
authors.lastname: Waring
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Siegel
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D053138:Cyclohexenes / Q000737:chemistry*; D000077222:Limonene; D010126:Ozone / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry*
chemical_list: D000336:Aerosols; D053138:Cyclohexenes; D013729:Terpenes; D010126:Ozone; D000077222:Limonene