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Abstract

During sampling, oxygenated terpenes may undergo decomposition through reaction with atmospheric ozone. We have studied their ozonolytic decomposition during reconcentration on Tenax. The saturated terpenoids, 1,8-cineole, bornyl acetate nopinone and pinonaldehyde are practically unaffected by ozone in the range of 8 to 120 ppbv. The degree of decomposition varies from 0 to 5% for the least reactive to 80 to 90% for the most reactive compounds. A broad range of material was investigated as potential ozone scavengers. By using the polymer noXon (polyphenylenesulfide) all the investigated compounds could be samples with quantitative recoveries even at high ozone mixing ratios. This ozone scrubber was tested for sampling of terpene oxidation products on Tenax and dinitrophenylhydrazine impregnated C(18)-silicagel cartridges. Recoveries from 85 to 110% were obtained for investigated compounds. The method was used for the analysis of oxidation products of terpenes in ambient air. Attention was focused on nopinone from beta-pinene, pinonaldehyde from alpha-pinene, 3-(1-methylethenyl)-6-oxo-heptanal and 4-acetyl-1-methyl-cyclohexane from limonene, and 5-(1-methylethyl)-bicyclo[3.1.0] hexan-2-one from sabinene. Nopinone was the only product which could be frequently detected in ratios from 0 to 90% of the measured beta-pinene concentrations. Pinonaldehyde was encountered only once (30% of alpha-pinene) while the other products were not, even at terpene concentrations as high as 5-14 ng L{-1}.

Additional information

Authors: CALOGIROU A, JRC Ispra (IT);DUANE M, JRC Ispra (IT);KOTZIAS D, JRC Ispra (IT);LAHANIATI M, JRC Ispra (IT);LARSEN B R, JRC Ispra (IT)
Bibliographic Reference: Article: Atmospheric Environment
Record Number: 199611170 / Last updated on: 1996-10-28
Category: PUBLICATION
Original language: en
Available languages: en
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