High H2O2 Concentrations Observed during Haze Periods during the Winter in Beijing: Importance of H2O2 Oxidation in Sulfate Formation
High H2O2 Concentrations Observed during Haze Periods during the Winter in Beijing: Importance of H2O2 Oxidation in Sulfate Formation
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北京冬季雾霾期间观测到的高 H2O2 浓度：H2O2 氧化对硫酸盐形成的重要性
DOI：
10.1021/acs.estlett.8b00579
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发表时间：
2018-11
影响因子：
10.9
通讯作者：
Mu Yujing
中科院分区：
文献类型：
--
作者：
Ye Can;Liu Pengfei;Ma Zhuobiao;Xue Chaoyang;Zhang Chenglong;Zhang Yuanyuan;Liu Junfeng;Liu Chengtang;Sun Xu;Mu Yujing
大气过氧化氢（H2O2）在硫酸盐形成中起着重要作用。为了探讨H2 O2氧化途径对北京冬季大气硫酸盐的贡献，于2016年、2017年和2018年冬季在城市（北京）和农村（望都）进行了三次大气H2 O2现场测量。在清洁和严重污染期间，H2O2浓度通常在检测限（0.05 ppbv）附近，而在中度污染期间观察到最高的H2O2浓度为0.90 ppbv。在中度污染日，日落后城区H2O2浓度明显增加，这主要是由于北京南部农村地区富H2O2空气的输送。在高NO浓度下，H2O2和PM2.5的浓度在白天也同时增加，这意味着非均相反应可能有助于H2O2和PM2.5的形成。
Atmospheric hydrogen peroxide (H2O2) plays an important role in sulfate formation. To explore the contribution of the H2O2 oxidation pathway to atmospheric sulfate in winter in Beijing, three field campaigns of atmospheric H2O2 measurements were conducted at an urban site (Beijing) and a rural site (Wangdu) during the winter in 2016, 2017, and 2018. The H2O2 concentrations were usually around the detection limit (0.05 ppbv) during clean and severely polluted periods, whereas the highest H2O2 concentration of 0.90 ppbv was observed during moderately polluted periods. Obvious increases in the concentration of H2O2 could be observed after sunset at the urban site during each moderately polluted day, which was mainly attributed to transportation of H2O2-rich air from the rural areas in the south of Beijing. Coincident increases in the concentrations of H2O2 and PM2.5 were also observed during the day at high NO concentrations, implying that heterogeneous reactions might contribute to the formation of H2O2 und...
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