High N2O5 Concentrations Observed in Urban Beijing: Implications of a Large Nitrate Formation Pathway,Environmental Science & Technology Letters

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High N2O5 Concentrations Observed in Urban Beijing: Implications of a Large Nitrate Formation Pathway
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2017-08-17 00:00:00 , DOI: 10.1021/acs.estlett.7b00341
Haichao Wang ₁ , Keding Lu ₁ , Xiaorui Chen ₁ , Qindan Zhu ₁ , Qi Chen ₁ , Song Guo ₁ , Meiqing Jiang ₁ , Xin Li ₁ , Dongjie Shang ₁ , Zhaofeng Tan ₁ , Yusheng Wu ₁ , Zhijun Wu ₁ , Qi Zou ₁ , Yan Zheng ₁ , Limin Zeng ₁ , Tong Zhu ₁ , Min Hu ₁ , Yuanhang Zhang _{1,

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Affiliation

The heterogeneous hydrolysis of dinitrogen pentoxide (N₂O₅) is important to understanding the formation of particulate nitrate (pNO₃^–). 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 O₃. 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 pNO₃^– formation potential by N₂O₅ heterogeneous uptake was calculated to be 24–85 μg m^–3 per night and, on average, 57 μg 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 pNO₃^– formation in Beijing.

更新日期：2017-08-17

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