Heterogeneous uptake of NO2 by sodium acetate droplets and secondary nitrite aerosol formation

Wen Xiu Pei, Shuai Shuai Ma, Zhe Chen, Yue Zhu, Shu Feng Pang*, Yun Hong Zhang

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

3 引用 (Scopus)

摘要

The high NO3 concentration in fine particulate matters (PM2.5) during heavy haze events has attracted much attention, but the formation mechanism of nitrates remains largely uncertain, especially concerning heterogeneous uptake of NOX by aqueous phase. In this work, the heterogeneous uptake of NO2 by sodium acetate (NaAc) droplets with different NO2 concentrations and relative humidity (RH) conditions is investigated by microscopic Fourier transform infrared spectrometer (micro-FTIR). The IR feature changes of aqueous droplets indicate the acetate depletion and nitrite formation in humid environment. This implies that acetate droplets can provide the alkaline aqueous circumstances caused by acetate hydrolysis and acetic acid (HAc) volatilization for nitrite formation during the NO2 heterogeneous uptake. Meanwhile, the nitrite formation will exhibit a pH neutralizing effect on acetate hydrolysis, further facilitating HAc volatilization and acetate depletion. The heterogeneous uptake coefficient increases from 5.2 × 10−6 to 1.27 × 10−5 as RH decreases from 90% to 60% due to the enhanced HAc volatilization. Furthermore, no obvious change in uptake coefficient with different NO2 concentrations is observed. This work may provide a new pathway for atmospheric nitrogen cycling and secondary nitrite aerosol formation.

源语言英语
页(从-至)320-327
页数8
期刊Journal of Environmental Sciences (China)
127
DOI
出版状态已出版 - 5月 2023

指纹

探究 'Heterogeneous uptake of NO2 by sodium acetate droplets and secondary nitrite aerosol formation' 的科研主题。它们共同构成独一无二的指纹。

引用此