The gas/particle partitioning of polycyclic aromatic hydrocarbons collected at a sub-Arctic site in Canada |
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| Authors: | Uwayemi M. Sofowote Hayley Hung Ankit K. Rastogi John N. Westgate Yushan Su Ed Sverko Ivy D’Sa Pat Roach Phil Fellin Brian E. McCarry |
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| Affiliation: | 1. Department of Environmental Engineering and Occupational Safety and Health, Faculty of Technical Sciences, University of Novi Sad, Serbia;2. Department of Landscape Architecture and Horticulture, Faculty of Agriculture, University of Novi Sad, Serbia;1. Centre for Environmental and Marine Studies, Department of Environment, University of Aveiro, 3810-193 Aveiro, Portugal;2. Dep. of Physics and Astronomy, Università di Firenze and INFN-Firenze, Sesto Fiorentino 50019, Italy;3. National Centre for Scientific Research (NCSR) “Demokritos”, 15341 Ag. Paraskevi, Attiki, Greece;4. Institute of Environmental Assessment and Water Research, Spanish Research Council, C/Jordi Girona, 08034 Barcelona, Spain;5. Institute of Geography and Geoecology, Karlsruhe Institute of Technology (KIT), Reinhard-Baumeister-Platz 1, 76131 Karlsruhe, Germany;6. Organic Geochemistry Unit (OGU), School of Chemistry, University of Bristol, Cantock''s Close, Bristol BS8 1TS, UK;7. Institute of Geography & Oeschger Centre for Climate Change Research, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland |
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| Abstract: | Polycyclic aromatic hydrocarbons (PAH) were measured in air samples at a remote air monitoring site established in the Yukon Territory, Canada as part of a global project (International Polar Year; IPY) to study the potential for atmospheric long-range transport of anthropogenic pollutants to the Arctic. Gas- and particle-phase PAH were collected in polyurethane foam plugs and on glass fibre filters respectively from August 2007 to October 2009. PAH concentrations were found to be highest in the winter months and lowest in summer. The gas/particle partitioning coefficients of 3–5 ringed PAH were computed and seasonal averages were compared. In the summer time, lower molecular mass PAH exhibited relatively higher partitioning into the particle-phase. This particle-phase partitioning led to the shallowest slopes being recorded during summer for the log–log correlation plots between the PAH partition coefficients and their sub-cooled vapour pressures. Air mass back trajectories suggest that local impacts may be more important during the summer time which is marked by increased camping activities at camping sites in the proximity of the sampling station. In conclusion, both summer and wintertime variations in PAH concentrations and gas/particle partitioning are considered to be source- and phototransformation-dependent rather than dependent on temperature-driven shifts in equilibrium partitioning. |
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