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Teflon bag experiments were carried out in the dark in order to study the gas-phase reactions of selected monoterpenes with ozone in the presence of SO(2) (beta-pinene) as well as in the presence of SO(2)/NO(2) (alpha-pinene, beta-pinene, limonene). Emphasis was on identifying the main reaction products and quantifying the sulphuric acid aerosol. Apart from the sulphuric acid aerosol, no sulphur-containing compounds could be detected. It was found that the reaction of beta-pinene with ozone, SO(2) and NO(2) led mainly to 6,6-dimethyl-bicyclo (3.1.1) heptan-2-one (n-delta-pinone), the alpha-pinene-O(3)-SO(2)-NO(2)-reaction produced 2', 2'-dimethyl-3- acetyl cyclobutyl ethanal (pinonaldehyde). The reaction of limonene with ozone-SO(2)-NO(2) led mainly to an unidentified product with a molecular weight M(+)134. In addition to the above mentioned volatile products, the formation of organic nitrates could be established by means of gas chromatography mass spectrometry. The yield of H(2)SO(4) in the system beta-pinene/O(3)/SO(2) varied between 0.13 and 0.44, depending on the initial conditions such as the humidity. In the system terpene/O(3)/SO(2)/NO(2) the yield of H(2)SO(4) was for alpha-pinene 0.01 to 0.03, for beta-pinene 0.07 to 0.13 and for limonene 0.02 to 0.09.

Additional information

Authors: KOTZIAS D, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Biogenic Compounds: their Reactions with Atmospheric Pollutants in the Forests, Kassel (DE), Feb. 2, 1990
Availability: Available from (1) as Paper EN 35330 ORA
Record Number: 199011730 / Last updated on: 1994-12-02
Original language: en
Available languages: en