PAHs associated with the leaves of three deciduous tree species. I — Concentrations and profiles
2000
Howsam, Michael | Jones, K.C | Ineson, P | Facteurs de Risque et Déterminants Moléculaires des Maladies liées au Vieillissement - U 1167 (RID-AGE) ; Institut Pasteur de Lille ; Pasteur Network (Réseau International des Instituts Pasteur)-Pasteur Network (Réseau International des Instituts Pasteur)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [CHU Lille] (CHRU Lille) | Lille Inflammation Research International Center - U 995 (LIRIC) ; Institut Pasteur de Lille ; Pasteur Network (Réseau International des Instituts Pasteur)-Pasteur Network (Réseau International des Instituts Pasteur)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [CHU Lille] (CHRU Lille) | Centre Universitaire de Mesures et d'Analyses [Université de Lille] (CUMA) ; Université de Lille, Droit et Santé | Centre d'Etudes et de recherche en Santé-Travail-Environnement (CERESTE) | CSIC-Barcelone | Faculteit der Aard- en Levenswetenschappen, Vrije Universiteit ; Vrije Universiteit Amsterdam [Amsterdam] (VU) | INSTITUTE OF ENVIRONMENTAL AND BIOLOGICAL SCIENCES LANCASTER GBR ; Partenaires IRSTEA ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Lancaster Environment Centre ; Lancaster University | University of York [York, UK]
International audience
Afficher plus [+] Moins [-]anglais. Results for the concentrations of total polycyclic aromatic hydrocarbons (ΣPAH) and the PAH profile in leaves from three deciduous tree species from the same woodland are presented, and discussed with reference to environmental and leaf-related variables. There were significant differences between oak, ash and hazel leaves in their ΣPAH concentrations (sum of 23 PAHs), and in the relative contribution of individual PAHs to the sum. Leaves exhibiting pubescence (hairiness) were found to have significantly higher ΣPAH concentrations than hairless leaves, regardless of their position in the vegetation strata of the wood. Hazel leaves from the understorey had a PAH profile consisting of a greater proportion of the 4-, 5- and 6-ring PAHs than oak or ash from the canopy. This was concluded to be the result of the filtering effect of the main canopy on the air passing over and through it, with subsequent transfer of particles and attendant PAHs to the understorey below. The proportion of ΣPAH contributed by the 6-ring PAH in hazel leaves was negatively correlated with distance from the southern edge of the canopy. It is proposed that the predominantly windward edges of the woodland, where atmospheric turbulence is likely to be greatest, favoured the deposition of particle-bound PAHs to leaves.
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