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A series of smog chamber experiments have been conducted in which five cyclic monoterpenes were oxidized by ozone. The evolved secondary aerosol was analysed by gas chromatography-mass spectroscopy (GC-MS) and high perfomance liquid chromatography-mass spectroscopy (HPLC-MS) for non-volatile polar oxidation products with emphasis on the identification of carboxylic acids. Three classes of compounds were determined at concentration levels which corresponded with the low percentage molar yields: dicarboxylic acids, oxo-carboxylic acids and hydroxy-keto-carboxylic acids. Carboxylic acids are highly par and have lower vapour pressures than their corresponding aldehydes and may thus play an in important role in secondary organic aerosol formation processes.

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Authors: GLASIUS M ET AL, JRC Ispra Environment Institute, Ispra (IT)
Bibliographic Reference: Article: Environmental Science and Technology, 34 (2000) pp 1001-1010
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