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The mass accommodation coefficient of ammonium nitrate aerosol
Institution:1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;2. State Key Laboratory of Severe Weather, Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China;3. Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China;5. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;6. Air Quality Studies, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;7. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China;8. Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan;9. International Laboratory for Air Quality and Health, Institute of Future Environments, Queensland University of Technology, Brisbane, QLD 4001, Australia;10. CSIRO Oceans & Atmosphere, PMB1, Aspendale, VIC 3195, Australia
Abstract:The mass transfer rate of pure ammonium nitrate between the aerosol and gas phases was quantified experimentally by the use of the tandem differential mobility analyzer/scanning mobility particle sizer (TDMA/SMPS) technique. Ammonium nitrate particles 80–220 nm in diameter evaporated in purified air in a laminar flow reactor under temperatures of 20–27°C and relative humidities in the vicinity of 10%. The evaporation rates were calculated by comparing the initial and final size distributions. A theoretical expression of the evaporation rate incorporating the Kelvin effect and the effect of relative humidity on the equilibrium constant is developed. The measurements were consistent with the theoretical predictions but there was evidence of a small kinetic resistance to the mass transfer rate. The discrepancy can be explained by a mass accommodation coefficient ranging from 0.8 to 0.5 as temperature increases from 20–27°C. The corresponding timescale of evaporation for submicron NH4NO3 particles in the atmosphere is of the order of a few seconds to 20 min.
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