A sodium carbonate coated denuder for determination of nitrous acid in the atmosphere |
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| Institution: | 1. Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China;2. Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang 310030, China;3. Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang 310024, China;4. Muyuan Foodstuff Co., Ltd, Longsheng Industrial Park Wolong District, Nanyang, 473000, Henan Province, China;1. Doctorate Programme in Biomedical Sciences and Public Health, National University of Distance Education (UNED), Madrid, Spain;2. National School of Public Health, Carlos III Institute of Health (ISCIII), Madrid, Spain;3. Library and Information Science Department, Madrid Complutense University, Madrid, Spain;4. European Environment Agency (EEA), Copenhagen, Denmark;1. Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Germany;2. Department of Geosciences, University of Oslo, Norway;3. Max Planck Institute for Biogeochemistry, Jena, Germany;1. Chemical, Oil & Gas College, Faculty of Engineering, Shiraz University, Shiraz, Iran;2. Ahwaz Faculty of Petroleum, Petroleum University of Technology, Ahwaz, Iran;3. Fakultät der Prozesswissenschaften, Technische Universität Berlin, Berlin, Germany |
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| Abstract: | A denuder technique for sampling and analysing nitrous acid at sub ppb levels in air is described. After sampling, the sodium carbonate coated denuder is leached in water, and the NO−2 concentration is determined spectrophotometrically. Field tests show that PAN is partly sorbed and hydrolized to nitrite in the sodium carbonate layer. It seems as HNO2 also can be formed by heterogeneous reactions between NO and NO2 at the denuder wall. These sampling artifacts were overcome by sampling with two or three denuders in series. The presence of PAN deteriorates the detection limit, which during optimal conditions is about 0.5 nmole m−3 (0.01 ppb). The method is therefore not recommended for measurements in background air, where HNO2 concentrations normally are low compared to PAN concentrations. |
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