نتایج جستجو برای: atmospheric oxidation
تعداد نتایج: 192737 فیلتر نتایج به سال:
Selective oxidation of benzylic amines to imines with atmospheric O2 is achieved in water on TiO2 under UV irradiation. The afforded imine could be easily separated and TiO2 can be recycled by filtration. To scale up, gram-scale imine products can be obtained.
Abstract Nitrous acid (HONO) is the major precursor of hydroxyl (OH) radicals to initiate tropospheric chemistry leading formation secondary pollutants. The sources atmospheric HONO, however, are not fully understood. Here we show two additional HONO that stem from oxidation nitrogen oxide (NO x = NO + 2 ). Nitric (HNO 3 ) formed photooxidation can be converted into with a yield ~53%, and dark ...
Measurement-based modeling of bromine-induced oxidation of mercury above the Dead Sea E. Tas, D. Obrist, M. Peleg, V. Matveev, X. Faı̈n, D. Asaf, and M. Luria The Institute of Earth Sciences, The Hebrew University, Jerusalem, Israel Department of Environmental Sciences and Energy, The Weizmann Institute of Science, Israel Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio P...
South Korea routinely experiences poor air quality with ozone and small particles exceeding standards. To build a better understanding of this problem, in 2016, the KORea-United States cooperative Air Quality (KORUS-AQ) study collected surface airborne measurements many chemical species, including reactive gases hydroxyl (OH) hydroperpoxyl (HO2). Several different results are reported here. Fir...
Alpha-pinene oxidation was studied in the CERN CLOUD chamber under near atmospheric conditions using varying levels of different oxidizers (i.e., O3, HOx and NOx with differing gas mixture compositions) in the presence and absence of UV-radiation, SO2 and additional organic traces; ammonia (NH3) and dimethylamine (DMA). The oxidation products and their evolution due to aging in the chamber were...
In the present study, we examined PM2.5 continental rural background aerosols, which were collected during a summer field campaign at K-puszta, Hungary (4 June–10 July 2003), a mixed coniferous/deciduous forest site characterized by intense solar radiation during summer. Emphasis was placed on polar oxygenated organic compounds that provide information on aerosol sources and source processes. T...
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