ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-13-2703-2013 Chemical characterization and stable carbon isotopic composition of particulate Polycyclic Aromatic Hydrocarbons issued from combustion of 10 Mediterranean woods Guillon A. 1 2 Le Ménach K. 1 2 Flaud P.-M. 1 2 Marchand N. https://orcid.org/0000-0001-9745-492X 3 Budzinski H. 1 2 Villenave E. 1 2 CNRS, EPOC, UMR5805, 33400 Talence, France Univ. Bordeaux, EPOC, UMR5805, 33400 Talence, France Universités d'Aix-Marseille-CNRS, 6264, Laboratoire Chimie Provence, Equipe Instrumentation et Réactivité Atmosphérique, Marseille, 13331, France 06 03 2013 13 5 2703 2719 Copyright: © 2013 A. Guillon et al. 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/13/2703/2013/acp-13-2703-2013.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/13/2703/2013/acp-13-2703-2013.pdf

The objectives of this study were to characterize polycyclic aromatic hydrocarbons from particulate matter emitted during wood combustion and to determine, for the first time, the isotopic signature of PAHs from nine wood species and Moroccan coal from the Mediterranean Basin. In order to differentiate sources of particulate-PAHs, molecular and isotopic measurements of PAHs were performed on the set of wood samples for a large panel of compounds. Molecular profiles and diagnostic ratios were measured by gas chromatography/mass spectrometry (GC/MS) and molecular isotopic compositions (<i>δ</i><sup>13</sup>C) of particulate-PAHs were determined by gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS). Wood species present similar molecular profiles with benz(a)anthracene and chrysene as dominant PAHs, whereas levels of concentrations range from 1.8 to 11.4 mg g<sup>−1</sup> OC (sum of PAHs). Diagnostic ratios are consistent with reference ratios from literature but are not sufficient to differentiate the species of woods. Concerning isotopic methodology, PAH molecular isotopic compositions are specific for each species and contrary to molecular fingerprints, significant variations of <i>δ</i><sup>13</sup>C are observed for the panel of PAHs. This work allows differentiating wood combustion (with <i>δ</i><sup>13</sup>C<sub>PAH</sub> = −28.7 to −26.6&permil;) from others origins of particulate matter (like vehicular exhaust) using isotopic measurements but also confirms the necessity to investigate source characterisation at the emission in order to help and complete source assessment models. These first results on woodburnings will be useful for the isotopic approach to source tracking.

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