Polycyclic Aromatic Hydrocarbon Deposition in the

Authors: S Cho K Sharma B W Brassard R Hazewinkel

Publish Date: 2014/04/15

Volume: 225, Issue: 5, Pages: 1910-

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Abstract

In the Athabasca Oil Sands Region AOSR of Alberta Canada increased concentrations of polycyclic aromatic hydrocarbons PAHs in the regional ecosystems and downstream of oil sands development have been observed presumably originating from various sources including those of oil sands and nonoil sands activities In this study we investigated the extent that oil sands activities contribute PAHs to the snowpack of the AOSR The dominant groups of PAHs found in our snow samples were dibenzothiophenes phenanthrenes/anthracenes fluranthenes/pyrenes chrysenes and fluorenes These PAHs were highly dominated by alkylated species especially near oil sands operations Aerial deposition of PAHs declined exponentially with increasing distance from the geographic center GC which was located close to Suncor and Syncrude’s oil sands operations The higher aerial deposition at similar distances from GC in the NS versus WE directions reflects that PAH inputs from oil sands operations are clustered along the Athabasca River Patterns of air parcel movements derived from HYbrid SingleParticle Lagrangian Integrated Trajectory HYSPLIT modeling closely matched patterns of aerial deposition supporting that regional wind patterns influence the transport of PAHs emitted by oil sands operations in the AOSR The source attribution techniques employed in this study revealed that sampling location influenced the characteristics of PAHs deposited PAHs deposited at sites close to GC were associated with industrial activity whereas the influences of other sources became increasingly apparent as distance increased from major oil sands areasWe would like to thank Shelley Manchur and Brian Jackson for performing the field work Preston McEachern for suggestions on study design and providing valuable inputs and Hannah McKenzie for GIS support We also wish to thank Julius Pretorius Grant Prill Ryan Rybchuk and Brian Fahlman Alberta Innovates Technology Futures Lawrence Cheng and Caroline Bampfylde Alberta Environment and Sustainable Resource Development and Mike McCarthy and Steve Brown Sonoma Technology Inc Base GIS data was provided by the Spatial Data Warehouse Ltd Funding for this study was provided by Alberta Environment and Sustainable Resource Development’s Comprehensive Contaminant Load Study

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