Candle burning is a considerable contributor to indoor pollutants, while secondary organic aerosols (SOA) from monoterpene ozonolysis represent another type. However, knowledge of the interactions of different indoor pollutants is limited. We investigated physicochemical properties of SOA generated from typical indoor chemistry of the O₃/α-pinene reaction with and without the presence of particles and gases from a burning candle. Ozonolysis of α-pinene in the presence of candle gaseous emissions yielded a considerably lower particle number, larger particle sizes, and lower particle oxygen-to-carbon ratio compared with experiments without candle emissions. More nitrogen-containing organic compounds were observed in the aerosol phase with candle emissions. Furthermore, concentrations of some typical particle-phase products from the O₃/α-pinene reaction (i.e., terebic acid, cis-pinic acid, and 3-methyl-1,2,3-butanetricarboxylic acid) were less abundant in the presence of candle emissions. The predicted volatility of particulate organic compounds was higher in experiments with candle emissions. The study demonstrates that candle burning can affect the chemical and physical properties of particles formed from other sources (e.g., α-pinene ozonolysis) by affecting gas-phase chemistry and gas-particle partitioning.

中文翻译：

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烛式排放对单萜氧化化学和仲有机气溶胶的影响


蜡烛燃烧是室内污染物的重要来源，而单萜臭氧分解产生的二次有机气溶胶 （SOA） 是另一种类型。然而，对不同室内污染物相互作用的了解是有限的。我们研究了 O₃/α-蒎烯反应的典型室内化学反应产生的 SOA 的物理化学性质，无论是否存在燃烧蜡烛的颗粒和气体。与没有烛光排放的实验相比，在烛状气体排放存在下对 α-蒎烯进行臭氧分解产生了相当低的颗粒数量、更大的颗粒尺寸和更低的颗粒氧碳比。在带有蜡烛排放的气溶胶阶段观察到更多的含氮有机化合物。此外，在烛光发射存在下，O₃/α-蒎烯反应中一些典型颗粒相产物（即对乙酸、顺式-蒎酸和 3-甲基-1,2,3-丁烷三羧酸）的浓度较低。在蜡烛排放实验中，颗粒有机化合物的预测挥发性更高。该研究表明，蜡烛燃烧可以通过影响气相化学和气粒分配来影响其他来源（例如 α-蒎烯臭氧分解）形成的颗粒的化学和物理性质。