水溶液
化学
气溶胶
质谱法
双水相体系
化学电离
分析化学(期刊)
化学反应
反应速率
电离
化学工程
无机化学
环境化学
色谱法
离子
有机化学
催化作用
工程类
作者
Yuanlong Huang,Kevin M. Barraza,Christopher M. Kenseth,Ran Zhao,Chen Wang,J. L. Beauchamp,John H. Seinfeld
标识
DOI:10.1021/acs.jpca.8b05353
摘要
Gas and aqueous phases are essential media for atmospheric chemistry and aerosol formation. Numerous studies have focused on aqueous-phase reactions as well as coupled gas/aqueous-phase mass transport and reaction. Few studies have directly addressed processes occurring at the air–water interface, especially involving surface-active compounds. We report here the application of field-induced droplet ionization mass spectrometry (FIDI-MS) to chemical reactions occurring at the atmospheric air–water interface. We determine the air–water interfacial OH radical reaction rate constants for sodium dodecyl sulfate (SDS), a common surfactant, and pinonic acid (PA), a surface-active species and proxy for biogenic atmospheric oxidation products, as 2.87 × 10–8 and 9.38 × 10–8 cm2 molec–1 s–1, respectively. In support of the experimental data, a comprehensive gas-surface-aqueous multiphase transport and reaction model of general applicability to atmospheric interfacial processes is developed. Through application of the model, PA is shown to be oxidized exclusively at the air–water interface of droplets with a diameter of 5 μm under typical ambient OH levels. In the absence of interfacial reaction, aqueous- rather than gas-phase oxidation is the major PA sink. We demonstrate the critical importance of air–water interfacial chemistry in determining the fate of surface-active species.
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