Adsorption and reaction of trichlorofluoromethane on various particles |
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| Authors: | Shuzo Kutsuna Koji Takeuchi Takashi Ibusuki |
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| Institution: | (1) Atmospheric Environment Protection Department, National Research Institute for Pollution and Resources, 16-3 Onogawa, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | As a possible tropospheric sink of trichlorofluoromethane (CCl3F), its adsorption and reaction on solid particles were studied with or without UV light longer than 310 nm. The adsorption and photodesorption occurred for most of the particles examined. The amounts depended not only on the BET surface area but also on the chemical property of the particles. The reaction rates were less than 0.1% h-1. The surface induced degradation of CCl3F in air was confirmed under photoirradiation at room temperature by the detection of Cl- or F- on some metal oxides. When the particles were pretreated with heat and evacuation, the reaction rate became larger and disproportionation of CCl3F took place. The tropospheric lifetime of CCl3F was reevaluated based on a reported model. It is suggested that the heterogeneous reaction of CCl3F on particles may be a possible tropospheric sink. |
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| Keywords: | Trichlorofluoromethane Particle Heterogenous reaction Tropospheric sink Stratospheric ozone |
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