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Etude des artefacts de prélèvement et de la
distribution gaz-particules des HAP

Abstract : Atmospheric polycyclic aromatic hydrocarbons (PAH) has been widely studied since several years because of their human health impact. Due to their physico-chemical properties, PAH in the atmosphere are present in particulate and gaseous phase. This gas-particle partitioning has a strong influence on PAH fate (degradation or deposition) and their health impact. So, for their study, a simultaneous samplig in the two atmospheric phases is necessary. In addition, the European Union (directive n°2004/107/CE) has recently decided that PAH should be monitored. Benzo(a)pyrene (BaP) has been chosen as tracer to represent this class of molecule. For both gas-particle partitioning study and for BaP monitoring, samplings are commonly carried out using high volume sampler. Unfortunately, several studies show that this kind of sampler induced sampling artefacts which could disturb the determination of the atmospheric concentrations in the two phases.
The aim of this work is to improve the sampling procedure of PAH by the validation of a denuder sampler previously calibrated under laboratory conditions. In this goal several field campaigns were carried out to compare particulate phase sampling and gas-particle partioning with both conventional and denuder samplers. For concentrations in the particulate phase the results showed significant differences between the two samplers which could be important (up to a factor 10), especially for the most reactive PAH such as BaP. This could be the result of degradations occurring on the filter of the conventional sampler during sampling whereas the filter of the denuder sampler is protected from the oxidants by the denuder tube. The importance of the degradation artefact seems more linked to “the aged of particle” than to the concentrations of oxidant. On the other hand, no relevant differences were observed for the partition study of this kind of semi-volatil coumpounds between the two devices. Finally we conceived and realised an experimental device in order to study the reactivity of PAH occuring in the denuder tube during sampling. The study have been realised for naphthalene with ozone as oxidant.
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Contributor : Mathieu Goriaux <>
Submitted on : Thursday, December 21, 2006 - 12:02:28 PM
Last modification on : Tuesday, March 30, 2021 - 3:24:37 AM
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  • HAL Id : tel-00121595, version 1



Mathieu Goriaux. Etude des artefacts de prélèvement et de la
distribution gaz-particules des HAP. Océan, Atmosphère. Université de Provence - Aix-Marseille I, 2006. Français. ⟨tel-00121595⟩



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