HONO来源及其对空气质量影响研究进展

综述了HONO来源(源排放、均相反应和非均相反应生成)、HONO模拟研究以及HONO来源对空气质量的影响.指出均相反应中激发态NO2与水汽作用形成HONO的机制在高NOx排放地区具有重要作用,但反应速率需进一步证实.非均相反应中水解反应可能是HONO最主要来源,空气质量模式模拟结果也支持该观点;soot表面的光照催化反应在soot高排放地区对HONO贡献较大,但仍需大量外场实验证实;土壤排放机理的外场实验研究极少,亟待加强.

Advances in HONO sources,HONO simulations,and the impacts of the HONO sources on regional or global air quality

HONO sources (i.e., HONO emissions, homogeneous gas-phase production and heterogeneous reaction production), HONO simulations, and the impacts of the HONO sources on regional or global air quality were reviewed. Reaction of photoexcited NO2 with water vapor contributed much to HONO formation in elevated NOx emission areas but the accurate reaction rate needs to be quantified. Heterogeneous formation of HONO on wet surfaces could be the key source of HONO, which was supported by air quality model simulations. The photosensitized NO2 reduction on soot is possibly a large contributor to HONO concentrations in high soot emission areas but the related field studies are required. Observations of HONO emissions from soil are very limited and urgently needed.