Nitrous and nitric acid measurements at sites in South-East England |
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| Institution: | 1. Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran;2. Dept. of Chemical and Environmental Engineering, University of Arizona, P.O. Box 210011, Tucson, AZ, USA;3. National University of Singapore, NUS Environmental Research Institute (NERI), 5 A Engineering Drive 1, T-Lab Building, #02-01, Singapore 117411, Singapore;4. Department of Veterinary Biomedical Sciences and Toxicological Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;1. Leibniz Institute of Surface Modification, Permoserstr. 15, 04303 Leipzig, Germany;2. Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt;3. Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Permoserstr. 15, 04318 Leipzig, Germany;1. College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China;2. North China Electric Power Research Institute Co Ltd., Beijing, 100045, China;1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan, 430074, China;2. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China;3. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China;1. Department of Hydrology and Hydraulic Engineering, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium;2. Biosphere Impact Studies, Belgian Nuclear Research Centre SCK•CEN, Boeretang 200, BE-2400, Mol, Belgium;3. Laboratory of Analytical and Environmental Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050, Brussels, Belgium |
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| Abstract: | Measurements of HONO and HNO3 have been made using annular denuder samplers at sites in south-east England. Whilst concentrations of HNO3 exhibited a diurnal variation, with a maximum in mid-afternoon nitrous acid shows the opposite diurnal cycle with maximum levels at night due to daytime photolysis. Concentrations of HONO increase with those of NO2, and elevated nighttime HONO level appear to be followed by high levels of HNO3 the following day. Average concentrations of HONO (0.45± 0.26 ppb in 24 h samples are comparable to those of HNO3 (0.56±0.36 ppb in 24 h samples), each representing about 5–10% of the concentration of NO2. Although NO2 oxidation provides the source of HNO3 concentrations of the two compounds are not related, presumably since the formation of NH4NO3 aerosol limits HNO3 concentrations at out site. |
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