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[C-1.3.3 Studies on the Formation Process of Acidic and Oxidative Substances in Air]

[Contact Person]

Shiro Hatakeyama
Senior Research Scientist
Global Environment Division
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-50-2502, Fax +81-298-56-7170
E-mail: hatashir@nies.go.jp

[Total Budget for FY1994-1995]

14,275,000 Yen (FY1995 6,190,000 Yen)

[Abstract]

　Formation mechanism of organic peroxides in ozone-olefin reactions was studied. Main organic peroxides studied were methyl hydroperoxide(CH₃OOH, MHP), hydroxymethyl hydroperoxide(HOCH₂OOH, HMHP), and 2-hydroxyethyl hydroperoxide(HOCH₂CH₂OOH, 2-HEHP). A large volume photochemical reaction chamber was employed for experiments. The mist chamber technique was introduced to collect hydroperoxides in air. It was found that the Criegee intermediate (CH₂OO), which is the primary product of ozone-olefin reactions, reacts with water vapor to give HMHP. 2-HEHP was only found in ozone-ethylene reactions. This compound was identified as MHP in previous studies. We found a small difference in HPLC retention time between MHP and the product of ozone ethylene reactions. It was speculated that the compound must be 2-HEHP formed by a side reaction, i.e., an OH-ethylene reaction.
　High concentration of ozone was observed at Mt. Maeshirane, where serious forest decline is visible. A battery driven ozone sensor and a small data logger were used with batteries and solar panels. More than 100 ppb of ozone was observed when wind brew from south east, which indicates the impact of a large amount of emission of atmospheric pollutants in Tokyo metropolitan area.
　Analysis techniques for atmospheric peroxides were developed and applied for field measurements.
　The reactions of SO₂ on the surface of Kosa particles were also investigated employing a cylindrical reaction vessel. Collected Kosa particles and desert soil particles collected in China were submitted for experiments.

[Key Words]

Organic Peroxides, Hydrogen Peroxide, Kosa Particles, OH Radicals