EGU21-9395
https://doi.org/10.5194/egusphere-egu21-9395
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Atmospheric nitrated phenols at a mountain site in North China: compositions, phase partitioning, and aqueous formation

Xinfeng Wang1, Min Li1, Yanan Zhao1, Ping Du2, Zhiyi Liu1, Hongyong Li1, Hengqing Shen1, Likun Xue1, Yan Wang2, Jianmin Chen3, and Wenxing Wang1
Xinfeng Wang et al.
  • 1Shandong University, Environment Research Institute, Qingdao, China (xinfengwang@sdu.edu.cn)
  • 2School of Environmental Science and Engineering, Shandong University, Qingdao, China
  • 3Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai, China

Nitrated phenols in the atmosphere are receiving increasing attentions due to their light absorption and biological toxicity. However, the partitioning characteristics of nitrated phenols among gas, particle, and aqueous phases and the dominant influencing factors remain unclear. In this work, particulate, gaseous, and cloud water samples were simultaneously collected at the summit of Mt. Tai in North China in spring, summer and winter. The contents of 11 nitrated phenols in these samples were determined with an ultra-high-performance liquid chromatograph in tandem with a mass spectrometer. The total concentrations of nitrated phenols in PM2.5 were in the range of several to dozens of ng m-3, a little lower than those measured in gas phase. The total concentrations of nitrated phenols in cloud water were in the level of hundreds of µg L-1. Among the 11 nitrated phenols, 4-nitrophenol and nitrosalicylic acids were the most dominant compounds in PM2.5, while 4-nitrophenol and 2,4-dinitrophenol were the most abundant in gas-phase and cloud water samples. During cloud events, most nitrated phenols were mainly distributed in particle phase, except dinitrophenols which were mainly distributed in gas phase. The observed concentration ratios of aqueous nitrated phenols to those in gas phase were one to two orders higher than the theoretical Henry’s law coefficients in pure water. Moreover, the measured concentrations of particulate nitrated phenols were substantially greater than the theoretically predicted values. The above results indicate that nitrated phenols potentially formed via aqueous-phase reactions inside the cloud droplets or on the surface of particles. The much higher ratios of the sum of 4-nitrophenol and 5-nitrosalicylic acid to 2,4-dinitrophenol in cloud water than those in PM2.5 further confirms the enhanced formation via aqueous processes. Overall, aqueous-phase reactions were important sources of atmospheric nitrated phenols during cloud events and had significant influences on the abundance and distributions of nitrated phenols in different phases.

How to cite: Wang, X., Li, M., Zhao, Y., Du, P., Liu, Z., Li, H., Shen, H., Xue, L., Wang, Y., Chen, J., and Wang, W.: Atmospheric nitrated phenols at a mountain site in North China: compositions, phase partitioning, and aqueous formation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9395, https://doi.org/10.5194/egusphere-egu21-9395, 2021.

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