Naphthalene‐Derived Secondary Organic Aerosols Interfacial Photosensitizing Properties
Naphthalene‐Derived Secondary Organic Aerosols Interfacial Photosensitizing Properties
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DOI：
10.1029/2021gl093465
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发表时间：
2021-06
影响因子：
5.2
通讯作者：
Xinke Wang;R. Gemayel;V. J. Baboomian;Kangwei Li;A. Boréave;C. Dubois;S. Tomaz;S. Perrier;S. Nizkorodov;Christian George
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文献类型：
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作者：
Xinke Wang;R. Gemayel;V. J. Baboomian;Kangwei Li;A. Boréave;C. Dubois;S. Tomaz;S. Perrier;S. Nizkorodov;Christian George
我们研究了羟基自由基（OH）引发萘氧化过程中形成的二次有机气溶胶（SOA）的光敏特性。将该 SOA 注入气溶胶流管并暴露于紫外线辐射和气态挥发性有机化合物或二氧化硫 (SO2) 中。通过光敏吸收 d-柠檬烯和 β-蒎烯，观察到气溶胶颗粒的尺寸增大。在存在 SO2 的情况下，在所有相对湿度 (RH) 水平下均观察到硫酸盐的光敏生成（0.2–0.3 µg m−3 h−1）。在黑暗中，颗粒上也会形成一些硫酸盐，这可能是由于有机过氧化物的存在。暗路径和光化学路径随 RH 表现出不同的趋势，揭示了本体和表面化学的不同贡献。由于萘和其他多环芳烃是城市和郊区重要的 SOA 前体，这些暗反应和光敏反应可能在硫酸盐和 SOA 的形成中发挥重要作用。
We investigated the photosensitizing properties of secondary organic aerosol (SOA) formed during the hydroxyl radical (OH) initiated oxidation of naphthalene. This SOA was injected into an aerosol flow tube and exposed to UV radiation and gaseous volatile organic compounds or sulfur dioxide (SO2). The aerosol particles were observed to grow in size by photosensitized uptake of d‐limonene and β‐pinene. In the presence of SO2, a photosensitized production (0.2–0.3 µg m−3 h−1) of sulfate was observed at all relative humidity (RH) levels. Some sulfate also formed on particles in the dark, probably due to the presence of organic peroxides. The dark and photochemical pathways exhibited different trends with RH, unraveling different contributions from bulk and surface chemistry. As naphthalene and other polycyclic aromatics are important SOA precursors in the urban and suburban areas, these dark and photosensitized reactions are likely to play an important role in sulfate and SOA formation.