Excess particulate and gaseous bromine at a remote coastal location |
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| Institution: | 1. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China;2. Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China;1. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, China;3. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, Guangdong 510006, China;4. Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi 712100, China;5. School of Earth and Environment, Anhui University of Science & Technology, Huainan, Anhui Province 232001, China;1. School of Civil Engineering, University of Leeds, Woodhouse Lane, LS2 9JT, Leeds, United Kingdom;2. POPs Environmental Consulting, Lindenfirststr. 23, D.73527, Schwäbisch Gmünd, Germany |
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| Abstract: | Samples were collected at remote sites on the Isle of Harris, off the northwest coast of Scotland, to determine levels of particulate Br and gaseous Br trapped on base-impregnated filters. Lead and Na were also measured so that an estimate of the Br contribution from sea salt and vehicular pollution could be made. Particulate Br levels of more than double this estimated amount were recorded, with ‘excess’ Br concentrations of up to 54 ng m−3 being measured. Gaseous Br (believed to be mainly in the form of HBr) was found in similar, or somewhat higher, concentrations as particulate Br, with a mean of 28 ng Br m−3, compared with the mean particulate level of 21 ng m−3. It is conjectured that a similar situation exists at these sites as has been observed in the Arctic spring, where it appears that biochemically produced organobromine gases are photolyzed, with the subsequent removal of O3 and formation of both particulate Br and gaseous HBr. This may represent an important global source of reactive Br and a potential O3 sink in the marine troposphere. |
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