Photochemical Aging of Beijing Urban PM2.5: HONO Production

被引：129
作者：
Bao, Fengxia [1 ,2 ]
Li, Meng [1 ,2 ]
Zhang, Yue [1 ,2 ]
Chen, Chuncheng [1 ,2 ]
Zhao, Jincai [1 ,2 ]
机构：
[1] Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2018年 / 52卷 / 11期
关键词：
NITROUS-ACID; NITRIC-ACID; HETEROGENEOUS HYDROLYSIS; BOREAL FOREST; EAST-ASIA; PHOTOLYSIS; IMPACT; OZONE; HNO3; NUCLEATION;
D O I：
10.1021/acs.est.8b00538
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Photochemical aging represents an important transformation process of aerosol particles in the atmosphere, which greatly influences the physicochemical properties and the environmental impact of aerosols. In this work, we find that Beijing urban PM2.5 aerosol particles release substantial HONO, a significant precursor of center dot OH radicals, into the gas phase during the photochemical aging process. The generation of HONO exhibits a high correlation with the amount of nitrate in PM2.5 . The formation rate of HONO becomes gradually decreased with the irradiation time, but can be restored by introducing the acidic proton, indicative of the essential role of the acidic proton in the HONO production. Other environmental factors such as relative humidity, light intensity, and reaction temperature also possess important influences on HONO production. The normalized photolysis HONO (J(HNO3 -> HONO)) is in the range of 1.22 X 10(-5) s(-1) similar to 4.84 x 10(-4) s(-1) , which is 1-3 orders of magnitude higher than the reported photolysis rate constant of gaseous HNO3 . The present study implies that the photochemical aging of Beijing PM2.5 is an important atmospheric HONO production source.
引用
收藏
页码：6309 / 6316
页数：8
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