Laboratory tests of KI and alkaline annular denuders |
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| Institution: | 1. Danish Building Research Institute, Aalborg University Copenhagen, A.C. Meyers Vænge 15, DK-2450, Copenhagen SV, Denmark;2. National Research Centre for the Working Environment, Lersø Parkallé 105, DK-2100, Copenhagen Ø, Denmark;3. Scandinavian Bio-Medical Institute (SBMI), Rungstedvej 21, DK-2970, Hørsholm, Denmark;1. National Exposure Research Laboratory, Environmental Protection Agency, RTP, NC, USA;2. Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, RTP, NC, USA;1. Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;2. Guangdong Provincial Observation and Research Station for Coastal Atmosphere and Climate of the Greater Bay Area, Southern University of Science and Technology, Shenzhen, 518055, China;3. Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China;4. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;5. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, China;1. Programa de Pós-Graduação em Química, Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista, s/n, 24020-141, Valonguinho, Centro, Niterói, RJ, Brazil;2. Laboratório de Química Analítica Fundamental e Aplicada, Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista, s/n, 24020-141, Valonguinho, Centro, Niterói, RJ, Brazil;1. Faculty of Sciences and Engineering, Toyo University, 2100 Kujirai, Kawagoe City, Saitama 350-8585, Japan;2. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba City, Ibaraki 305-0053, Japan;3. Faculty of Engineering, Tohoku Institute of Technology, Yagiyama, Taihaku-Ku, Sendai City, Miyagi 982-8577, Japan;1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China;2. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, 210044, China;3. School of Earth Science and Engineering, Hebei University of Engineering, Handan, 056038, China |
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| Abstract: | Annular denuders coated with KI and with alkaline solutions have been tested for their ability to remove atmospheric pollutants including ozone, NO2, SO2, formaldehyde, methyl nitrate and peroxyacetyl nitrate. Tests were carried out at flow rates of 0.4–2.0 ? min?1, using particle-free ambient air as well as purified air to study the effect of atmospheric CO2 on alkaline denuder performance. Denuders coated with KI were efficient in removing O3, NO2, SO2 (> 95%) and PAN (84±3%) but not methyl nitrate (44%) and formaldehyde (<5%). Selective removal of PAN from NO2, and vice versa, could be obtained with annular denuders coated with NaOH, which removed 100% PAN and ?15% NO2, and with alkaline guaiacol, which removed ?99% NO2 and ?6% PAN. |
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