Photochemical Renoxification of Nitric Acid on Real Urban Grime
Photochemical Renoxification of Nitric Acid on Real Urban Grime
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DOI：
10.1021/es3037862
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发表时间：
2013-01-15
影响因子：
11.4
通讯作者：
Donaldson, D. J.
中科院分区：
文献类型：
--
作者：
Baergen, Alyson M.;Donaldson, D. J.
了解氮氧化物（=NO + NO2）的命运很重要，因为氮氧化物通过其在O-3形成中的作用，在空气质量决定中起着重要作用。本文表明，城市大气的再氧化作用可能是通过沉积在城市污垢上的HNO3的光解作用发生的。在多伦多，7月1日中午的J值分别为1.2 × 10(-3) s（-1）和1.0 × 10(-7) s(-1)，比水中的光解作用快4个数量级。城市污垢中硝酸盐的光解作用可能遵循与硝酸盐水溶液光解作用相同的机制，包括NO2、OH和可能的HONO的形成。因此，氮氧化物可以迅速返回到大气中，而不是最终通过薄膜冲洗从大气中除去。
The fate of NOx (=NO + NO2) is important to understand because NOx is a significant player in air quality determination through its role in O-3 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 x 10(-3) s(-1) for nitrate on urban grime and 1.0 x 10(-7) s(-1) 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 NOx may be rapidly returned to the atmosphere rather than being ultimately removed from the atmosphere through film wash off.