In a Eucalyptus forest in Portugal were investigated (a) the formation of secondary organic aerosol formed through the condensation of low vapor pressure products of monoterpenes (α- and β-pinene) photooxidation and (b) the chemical structure of these products related to their ability to form new particles. Two isomers of pinonic acid ( cis- and trans- 2,2-dimethyl-3-acetylcyclobutylethanoic acid) and norpinonic acid ( cis- and trans- 2,2-dimethyl-3-acetylcyclobutylmethanoic acid), pinic acid ( cis- 2,2-dimethyl-3-carboxycyclobutylethanoic acid), pinonaldehyde (2,2-dimethyl-3-acetylcyclobutylethanal), and nopinone (6,6-dimethylbicyclo[3.1.1]heptan-2-one) were detected in all forest aerosol samples. By considering the diurnal concentration pattern of the acidic products and Aitken nuclei observed during the same periods, our results indicated that cis - and trans -pinonic, cis - and trans - norpinonic and pinic acids are photooxidation products of α-pinene chemically coupled with new particles formed. Lipids such as n -alkanes, n -alkanols, n -alkanals, and n -alkanoic acids determined in the forest aerosol were associated with primary biogenic emissions from Eucalyptus trees.
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Kavouras et al. (1999) studied this question.
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