Photochemical Renoxification of Nitric Acid on Real Urban Grime

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• 作者：Alyson M. Baergen ; D. J. Donaldson
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：January 15, 2013
• 年：2013
• 卷：47
• 期：2
• 页码：815-820
• 全文大小：293K
• 年卷期：v.47,no.2(January 15, 2013)
• ISSN：1520-5851

文摘

The fate of NO_x (=NO + NO₂) is important to understand because NO_x is a significant player in air quality determination through its role in O₃ formation. Here we show that renoxification of the urban atmosphere may occur through the photolysis of HNO₃ deposited onto urban grime. The photolysis occurs 4 orders of magnitude faster than in water with J values at noon on July 1 in Toronto of 1.2 脳 10^鈥? s^鈥? for nitrate on urban grime and 1.0 脳 10^鈥? s^鈥? for aqueous nitrate. Photolysis of nitrate present on urban grime probably follows the same mechanism as aqueous nitrate photolysis, involving the formation of NO₂, OH, and possibly HONO. Thus NO_x may be rapidly returned to the atmosphere rather than being ultimately removed from the atmosphere through film wash off.