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DOI10.1016/j.atmosres.2020.105310
A potential route for photolytic reduction of HgCl2 and HgBr2 in dry air and analysis about the impacts from Ozone
Tong Y.; Zhang H.; Lin H.; de Foy B.; Chen L.; Zhang W.; Wang X.; Guan C.
Date Issued2021
ISSN0169-8095
Volume249
Other AbstractAmong various gaseous oxidized mercury species, HgCl2 and HgBr2 are known to be more recalcitrant to direct photolysis under radiations. In this study, we examined a possible route to reduce HgCl2 and HgBr2 in the dry air under UV, visible and solar radiations with different levels of irradiances. Potential impact of O3 on the reductions of HgCl2 and HgBr2 were discussed. The laboratory results showed that if without any radiation, O3 would not influence the chemical conversions between HgCl2/HgBr2 and Hg0. However, if with involvement of radiation, a rapid reduction of HgCl2 and HgBr2 was observed, resulting in a significant production of Hg0 in the air. The magnitudes of reduction reactions heavily depended on the frequency of radiations as well as the irradiances. UV light had the strongest capacity to promote photoreduction of HgCl2 and HgBr2 even at relatively low irradiances. A relationship analysis indicated that the reduction of HgCl2 and HgBr2 was possibly related to the O3 concentrations in the air. We proposed that O3 might be involved in productions of the unstable intermediate HgIX (X = Br, Cl), which has a quicker photolysis rate than the HgIIX2. Our results suggest that the impacts of solar radiation and O3 on reductions of HgII species in the atmosphere are worth of being investigated theoretically and in both laboratory and field studies in the future, since it might be an important but lesser-known part in the atmospheric Hg chemistry. © 2020 Elsevier B.V.
enkeywordsHgCl2 and HgBr2; Irradiance; Ozone concentration; Photolytic reduction; Radiation
Language英语
scopus keywordsAtmospheric chemistry; Binary alloys; Bromine compounds; Mercury compounds; Photolysis; Solar radiation; Chemical conversions; Direct photolysis; Gaseous oxidized mercuries; Laboratory and field studies; Photolysis rates; Potential impacts; Reduction reaction; Relationship analysis; Chlorine compounds; atmospheric chemistry; concentration (composition); irradiance; mercury (element); ozone; photolysis; reduction; solar radiation; ultraviolet radiation
journalAtmospheric Research
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/145222
AffiliationSchool of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China; College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China; Department of Earth and Atmospheric Sciences, Saint Louis UniversityMO 63108, United States; School of Geographic Sciences, East China Normal University, Shanghai, 200241, China; School of Environment and Natural Resources, Renmin University of China, Beijing, 100872, China
Recommended Citation
GB/T 7714
Tong Y.,Zhang H.,Lin H.,et al. A potential route for photolytic reduction of HgCl2 and HgBr2 in dry air and analysis about the impacts from Ozone[J],2021,249.
APA Tong Y..,Zhang H..,Lin H..,de Foy B..,Chen L..,...&Guan C..(2021).A potential route for photolytic reduction of HgCl2 and HgBr2 in dry air and analysis about the impacts from Ozone.Atmospheric Research,249.
MLA Tong Y.,et al."A potential route for photolytic reduction of HgCl2 and HgBr2 in dry air and analysis about the impacts from Ozone".Atmospheric Research 249(2021).
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