Atmospheric Nitrated Phenolic Compounds in Particle, Gaseous, and Aqueous Phases During Cloud Events at a Mountain Site in North China: Distribution Characteristics and Aqueous‐Phase Formation

化学 微粒 环境化学 粒子(生态学) 双水相体系 水溶液 相(物质) 大气(单位) 气象学 有机化学 海洋学 物理 地质学
作者
Min Li,Xinfeng Wang,Yanan Zhao,Ping Du,Hongyong Li,Jiarong Li,Jianmin Chen,Zhiyi Liu,Yueru Jiang,Jing Chen,Yujian Bi,Yuyang Zhao,Likun Xue,Yan Wang,Jianmin Chen,Wenxing Wang
出处
期刊:Journal Of Geophysical Research: Atmospheres [Wiley]
卷期号:127 (18) 被引量:6
标识
DOI:10.1029/2022jd037130
摘要

Abstract Nitrated phenolic compounds in the atmosphere are receiving increasing attention due to their light absorption and biological toxicity. In this study, particulate, gaseous, and cloud water samples were simultaneously collected during cloud events at the summit of Mount Tai in northern China in spring, summer, and winter and the contents of 11 nitrated phenolic compounds were determined. The seasonal average concentrations of the total nitrated phenolic compounds in particles were in the range of 7.3–27.1 ng m −3 , a little lower than those measured in the gas‐phase (18.3–70.6 ng m −3 ). Their concentrations in cloud water were at the levels of 168.4–438.5 μg L −1 . 4‐Nitrophenol and nitrosalicylic acids were the dominant compounds in particles, while 4‐nitrophenol and 2,4‐dinitrophenol were the most abundant in the gas phase and cloud water samples. During cloud events, most nitrated phenolic compounds were mainly distributed in the particle phase, except dinitrophenols which were mainly distributed in the gas phase in winter. The field‐derived effective Henry's law coefficients were several orders of magnitude higher than their theoretical values in pure water. Moreover, the measured concentrations of particulate nitrated phenolic compounds were substantially greater than the theoretical predictions, especially in spring. The above results indicate that nitrated phenolic compounds were partly formed via aqueous‐phase reactions inside the cloud droplets or on the wet particle surfaces, which changed their distribution patterns. The much higher ratios of 2,4‐dinitrophenol to the sum of 4‐nitrophenol and 5‐nitrosalicylic acid in cloud water than those in particles further confirm the enhanced formation via aqueous processes.
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