Measurement of hydrogen peroxide and organic hydroperoxide concentrations during autumn in Beijing, China |
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| Authors: | Qingyu Zhang Jiaoyu Liu Youjiang He Jiaying Yang Jian Gao Houfeng Liu Wei Tang Yizhen Chen Wenhao Fan Xuan Chen Fahe Chai and Shiro Hatakeyama |
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| Institution: | 1.College of Environmental & Resource Sciences of Zhejiang University, Hangzhou 310058, China,1.College of Environmental & Resource Sciences of Zhejiang University, Hangzhou 310058, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,3.Zhejiang Huahai Pharmaceutical Co., Ltd., Taizhou 317000, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,4.College of Geography and Environment, Shandong Normal University, Jinan 250014, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,5.Beijing Center for Physical & Chemical Analysis, Beijing 100089, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and 6.Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8538, Japan |
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| Abstract: | Gaseous peroxides play important roles in atmospheric chemistry. To understand the pathways of the formation and removal of peroxides, atmospheric peroxide concentrations and their controlling factors were measured from 7:00 to 20:00 in September, October, and November 2013 at a heavily trafficked residential site in Beijing, China, with average concentrations of hydrogen peroxide (H2O2) and methyl hydroperoxide (MHP) at 0.55 ppb and 0.063 ppb, respectively. H2O2 concentrations were higher in the afternoon and lower in the morning and evening, while MHP concentrations did not exhibit a regular diurnal pattern. Both H2O2 and MHP concentrations increased at dusk in most cases. Both peroxides displayed monthly variations with higher concentrations in September. These results suggested that photochemical activity was the main controlling factor on variations of H2O2 concentrations during the measurement period. Increasing concentrations of volatile organic compounds emitted by motor vehicles were important contributors to H2O2 and MHP enrichment. High levels of H2O2 and MHP concentrations which occurred during the measurement period probably resulted from the transport of a polluted air mass with high water vapor content passing over the Bohai Bay, China. |
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| Keywords: | Peroxide Formation Controlling factor Volatile organic compound Transport of polluted air mass |
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