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Measurement of heterogeneous uptake of NO2 on inorganic particles, sea water and Urban grime

Journal of Environmental Sciences 2021年第8期33卷 124-135页

作者： Chuan Yu Zhe Wang Qingxin Ma Likun Xue Christian George Tao Wang Environment Research Institute Shandong UniversityQingdao 266237China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong Kong 999077China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Univ Lyon UniversitéClaude Bernard Lyon 1Centre National de la Recherche Scientifique(CNRS)Institut de Recherches sur la Catalyse et l’Environnement de Lyon(IRCELYON)Villeurbanne F-69626France

Heterogeneous reactions of NO2 on different surfaces play an important role in atmospheric NOxremoval and HONO formation,having profound impacts on photochemistry in polluted urban areas.Previous studies have suggested that the NO2 uptake on the ground or aerosol surfaces could be a dominant source for elevated HONO during the daytime.However,the uptake behavior of NO2 varies with different surfaces,and different uptake coefficients were used or derived in different studies.To obtain a more holistic picture of heterogeneous NO2 uptake on different surfaces,a series of laboratory experiments using different flow tube reactors was conducted,and the NO2 uptake coefficients(γ)were determined on inorganic particles,sea water and Urban grime.The results showed that heterogeneous reactions on those surfaces were generally weak in dark conditions,with the measuredγvaried fromUrban grime was observed,with the obvious formation of HONO and NO from the heterogeneous reaction.The photo-enhancedγwas measured to be 1.9×10-6 at 5%relative humidity(RH)and 5.8×10-6 at 70%RH on Urban grime,showing a positive RH dependence for both NO2 uptake and HONO formation.The results demonstrate an important role of Urban grime in the daytime NO2-to-HONO conversion,and could be helpful to explain the unknown daytime HONO source in the polluted urban area.

关键词： NO2 uptake HONO source Heterogeneous uptake coefficient Urban grime

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