Department of Civil, Architectural and Environmental Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, United States.
Environ Sci Technol. 2013 Jun 18;47(12):6341-8. doi: 10.1021/es400846d. Epub 2013 May 31.
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.
臭氧与萜烯类化合物反应会产生多种产物，其中一些可能形成二次有机气溶胶 (SOA)。本研究考察了臭氧与表面吸附的 D-柠檬烯（室内常见物质）的反应对气相 SOA 形成的贡献。建立了一个预测臭氧/萜烯表面反应生成 SOA 质量的模型框架，并在 283 L 室中进行稳态实验，以确定臭氧/D-柠檬烯在不锈钢上反应生成的 SOA 的气溶胶质量分数 ξs（SOA 形成量与臭氧/萜烯表面反应消耗的臭氧量之比）。结果表明，ξs 为 0.70-0.91，相对湿度越低，生成的 SOA 质量和数量越高。此外，表面反应比气相反应更促进成核，表面反应和气相反应生成的 SOA 的数量分别为 126-339 和 51.1-60.2 个/cm(3)每 μg/m(3)。我们还利用该模型框架预测，臭氧/D-柠檬烯表面反应可能导致气相 SOA 大量生成的室内环境是那些臭氧初始反应性低的表面，如玻璃、密封材料或光滑金属。
