Laboratory studies of some halogenated ethanes and ethers: Measurements of rates of reaction with OH and of infrared absorption cross-sections |
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| Institution: | 3. Human Nutrition Laboratory, ETH, Zurich, Switzerland;4. Iodine Global Network, Ottawa, Canada;5. Ministry of Health, Muscat, Oman;6. Ministry of Health, Dubai, United Arab Emirates;7. Ministry of Health, Kuwait City, Kuwait;8. Ministry of Education, Kuwait City, Kuwait;9. Supreme Council of Health, Doha, Qatar;10. Institute of Nutrition, Mahidol University, Bangkok, Thailand;11. Rollins School of Public Health, Emory University, Atlanta, GA;12. Shanxi Institute for Prevention and Treatment of Endemic Disease, LinFen, China;13. Department of Statistics, Iowa State University, Ames, IA;1. Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai, China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;3. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;1. Department of Physics, Fatima Mata National College, Kollam, Kerala, India;2. Department of Physics, TKM College of Arts and Science, Kollam, Kerala, India;3. Department of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India;4. Department of Studies in Chemistry, Industrial Chemistry Division, Mangalore University, Mangalagangotri 574 199, India;5. Department of Chemistry, University of Antwerp, B2610 Antwerp, Belgium;1. PRIST University, Vallam, Thanjavur, India;2. Periyar Maniammai University, Thanjavur, India;3. Department of Physics, A.V.C. College, Mayiladuthurai, Tamilnadu, India;4. Department of Physics, Tagore Arts College, Puducherry, India |
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| Abstract: | We have measured, using a conventional discharge-flow resonance-fluorescence technique, the rates of reaction between the hydroxyl radical and a series of halogenated ethanes and ethers for the temperature range 230–423 K. Our measurements gave the following Arrhenius expressions (units are cm3 molecule−1 s−1): CF2HCH3 (HFC-152), 14.2 × 10−13 exp-(1050/T); CF2ClCH3 (HCFC-142b), 2.6 × 10−13 exp-(1230/T); CFCl2CH3 (HCFC-141b), 5.8 × 10−13 exp-(1100/T); CF3CFH2 (HFC-134a), 5.8 × 10−13 exp-(1350/T); CF3CF2H (HFC-125), 2.8 × 10−13 exp-(1350/T); CF3CCl2H (HCFC-123), 11.8 × 10−13 exp-(900/T); CF2HOCF2CFClH, (enflurane), 6.1 × 10−13 exp-(1080/T); CFH2OCH(CF3)2, (sevoflurane), 15.3 × 10−13 exp-(900/T). In two cases, we measured rate constants only at room temperature: CF3CClBrH (halothane), 6 × 10−14 and CF2HOCClHCF3 (isoflurane), 2.1 × 10−14.We also report the following values for the integrated absorption cross-sections of the compounds in the spectral region 800–1200 cm−1 in units of cm−2 atm−1: CF2HCH3, 1155; CF2ClCH3, 1422; CFCl2CH3, 1995; CF3CFH2, 2686; CF3CF2H, 1970, CF3CCl2H, 1411; CF3CClBrH, 1400; CF2HOCF2CFClH, 4800; CF2HOCClHCF3, 3900; CFH2OCH(CF3)2, 2550. We use our measurements to calculate ozone depletion potentials and greenhouse warming potentials relative to CFCl3 for each compound. |
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