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[A-7.1.2 Transformation and Decomposition of Substitutes for CFCs in the Troposphere]

[Contact Person]

Takashi Ibusuki
Chief of Photo Energy Application Division
Global Warming Control Department
National Institute for Resources and Environment
Agency of Industrial Sciences and Technology, Ministry of
International Trade and Industry,
16-3 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-58-8160, Fax +81-298-58-8158
E-mail kutsuna@nire.go.jp

[Total Budget for FY1990-1992]

30,466,000 Yen

[Abstract]

　The tropospheric degradation mechanisms of CFCs Substitutes are investigated from laboratory experiments about gas-phase homogeneous chemical reactions, gas-solid and gas-liquid heterogeneous chemical reactions. The rate constants and/or degradation products for the gas-phase reaction of OH with CFCs substitutes, have been determined by using a laser photolysis - laser induced fluorescent system and a Fourier transform infrared absorption spectrometer equipped with a long path cell. Possible tropospheric sink of CFCs substitutes as heterogeneous chemical reactions are suggested.

[Key Words]

CFC substitutes, Environmental acceptability, Lifetime, Degradation products