High H2O2 Concentrations Observed during Haze Periods during the Winter in Beijing: Importance of H2O2 Oxidation in Sulfate Formation,Environmental Science & Technology Letters

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High H2O2 Concentrations Observed during Haze Periods during the Winter in Beijing: Importance of H2O2 Oxidation in Sulfate Formation
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2018-11-09 , DOI: 10.1021/acs.estlett.8b00579
Can Ye _{1,

2} , Pengfei Liu _{1,

2,

3} , Zhuobiao Ma _{1,

2} , Chaoyang Xue _{1,

2} , Chenglong Zhang _{1,

2,

3} , Yuanyuan Zhang _{1,

2,

3} , Junfeng Liu _{1,

2,

3} , Chengtang Liu _{1,

2,

3} , Xu Sun _{1,

4} , Yujing Mu _{1,

2,

3}

Affiliation

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 PM_2.5 were also observed during the day at high NO concentrations, implying that heterogeneous reactions might contribute to the formation of H₂O₂ under polluted conditions. In addition, the contrast between urban and rural measurements also provides some support for the potential formation of H₂O₂ from heterogeneous reactions. On the basis of the data measured in this study, sulfate formation through H₂O₂ oxidation was found to be the dominant pathway rather than the NO₂ oxidation pathway.

更新日期：2018-11-09

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