GEOSCAN Search Results: Fastlink


TitleUsing tree cores to evaluate historic atmospheric concentrations and trends of polycyclic aromatic compounds in the Oil Sands region of Alberta, Canada
AuthorRauert, C; Harner, T; Ahad, J M EORCID logo; Percy, K E
SourceScience of the Total Environment vol. 739, 139996, 2020 p. 1-7,
Alt SeriesNatural Resources Canada, Contribution Series 20200110
Mediapaper; on-line; digital
File formatpdf
NTS73M; 74D; 74E; 74L; 83P; 84A; 84H; 84I
Lat/Long WENS-113.5000 -110.0000 58.5000 55.7500
Subjectsenvironmental geology; fossil fuels; economic geology; geochemistry; Nature and Environment; Science and Technology; Economics and Industry; core samples; aromatic hydrocarbons; atmospheric geochemistry; bituminous sands; oil sands; petroleum resources; mining; Athabasca Oil Sands Region; Methodology; Trees; Atmospheric emissions
Illustrationsphotographs; plots; profiles; time series
ProgramProgram of Energy Research and Development (PERD)
Released2020 06 05
AbstractTree cores and bark were sampled from jack pine trees at 18 sites in the Athabasca Oil Sands Region (AOSR) of Alberta, Canada, to investigate spatial and temporal trends of polycyclic aromatic compounds (PACs). Spatial rends were investigated in the bark samples, where sum PAC concentrations ranged from 75 to 3615 ng/g. Highest concentrations were observed from trees within 40 km of the nearest mining or upgrading facility perimeter fence, in linewith previous deposition studies in the AOSR. The sampled tree cores were separated into segments representing 5 years of growth/atmospheric collection by counting tree rings. A significant increase in PAC concentrations over the lifetime of the tree was observed at sites with the highest PAC concentrations, and the average % increase in concentration from1970 to 2015was in linewith average % growth in bitumen extraction in the AOSR. Finally, the concentrations in the tree core segments representing collection from2010 to 2015 were converted into an atmospheric PAC concentration using previously published wood-air partition coefficients. The calculated atmospheric concentrations were within the same range as concentrations reported from the passive atmospheric sampling network in this region. The importance of site location is highlighted,with forest edge sites providing an improved comparison for atmospheric exposure and deposition. This is the first study to use tree cores to calculate an atmospheric concentration of PACs, demonstrating the applicability of this methodology for providing historic atmospheric data.

Date modified: