摘要:

The heterogeneous hydrolysis of dinitrogen pentoxide (N2O5) is important to understanding the formation of particulate nitrate (pNO(3)(-)). Measurements of N2O5 in the surface layer taken at an urban site in Beijing are presented here. N2O5 was observed with large day-to-day variability. High N2O5 concentrations were determined during pollution episodes with the co-presence of large aerosol loads. The maximum value was 1.3 ppbv (5 s average), associated with an air mass characterized by a high level of O-3. N2O5 uptake coefficients were estimated to be in the range of 0.025-0.072 using the steady-state lifetime method. As a consequence, the nocturnal pNO(3)(-) formation potential by N2O5 heterogeneous uptake was calculated to be 24-85 mu g m(-3) per night and, on average, 57 mu g m(-3) during days with pollution. This was comparable to or even higher than that formed by the partitioning of HNO3. The results highlight that N2O5 heterogeneous hydrolysis is vital in pNO(3)(-) formation in Beijing.

附注:

ISI Document Delivery No.: FJ7WPTimes Cited: 20Cited Reference Count: 34Wang, Haichao Lu, Keding Chen, Xiaorui Zhu, Qindan Chen, Qi Guo, Song Jiang, Meiqing Li, Xin Shang, Dongjie Tan, Zhaofeng Wu, Yusheng Wu, Zhijun Zou, Qi Zheng, Yan Zeng, Limin Zhu, Tong Hu, Min Zhang, YuanhangGuo, Song/D-9218-2012; Wu, Zhijun/A-7041-2012; Lu, Keding/A-7282-2012; Zeng, Limin/D-3948-2013; ZHU, TONG/H-6501-2011Guo, Song/0000-0002-9661-2313; Lu, Keding/0000-0001-9425-9520; ZHU, TONG/0000-0002-2752-7924; Wang, Haichao/0000-0001-6161-1874; Tan, Zhaofeng/0000-0002-3808-1964National Natural Science Foundation of China [41375124, 91544225, 21522701, 41421064]; Chinese Academy of Sciences [XDB05010500]; National Key Research and Development Program of China [2016YFC0202003]; State Key Joint Laboratory of Environment Simulation and Pollution Control [16Y01ESPCP]This work was supported by the National Natural Science Foundation of China (Grants 41375124, 91544225, 21522701, and 41421064), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDB05010500), the National Key Research and Development Program of China (Grant 2016YFC0202003), and the State Key Joint Laboratory of Environment Simulation and Pollution Control (Grant 16Y01ESPCP). The authors gratefully acknowledge the PKU science team.212468Amer chemical socWashington