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Rapid hydrolysis of NO at High Ionic Strengths of Deliquesced Aerosol Particles. | LitMetric

AI Article Synopsis

Article Abstract

Nitrogen dioxide (NO) hydrolysis in deliquesced aerosol particles forms nitrous acid and nitrate and thus impacts air quality, climate, and the nitrogen cycle. Traditionally, it is considered to proceed far too slowly in the atmosphere. However, the significance of this process is highly uncertain because kinetic studies have only been made in dilute aqueous solutions but not under high ionic strength conditions of the aerosol particles. Here, we use laboratory experiments, air quality models, and field measurements to examine the effect of the ionic strength on the reaction kinetics of NO hydrolysis. We find that high ionic strengths () enhance the reaction rate constants () by more than an order of magnitude compared to that at infinite dilution (), yielding log(/) = 0.04 or rate enhancement factor = 10. A state-of-the-art air quality model shows that the enhanced NO hydrolysis reduces the negative bias in the simulated concentrations of nitrous acid by 28% on average when compared to field observations over the North China Plain. Rapid NO hydrolysis also enhances the levels of nitrous acid in other polluted regions such as North India and further promotes atmospheric oxidation capacity. This study highlights the need to evaluate various reaction kinetics of atmospheric aerosols with high ionic strengths.

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Source
http://dx.doi.org/10.1021/acs.est.3c08810DOI Listing

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