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Isotopic Evidence for Oil Sands Petroleum Coke in the Peace-Athabasca Delta.

Jautzy, Josué; Ahad, Jason M. E.; Gobeil, Charles; Smirnoff, Anna; Barst, Benjamin D.; Savard, Martine M. (2015). Isotopic Evidence for Oil Sands Petroleum Coke in the Peace-Athabasca Delta. Environmental Science & Technology , vol. 49 , nº 20. p. 12062-12070. DOI: 10.1021/acs.est.5b03232.

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Résumé

The continued growth of mining and upgrading activities in Canada's Athabasca oil sands (AOS) region has led to concerns about emissions of contaminants such as polycyclic aromatic hydrocarbons (PAHs). Whereas a recent increase in PAR emissions has been demonstrated within around 50 km of the main center of surface mining and upgrading operations, the exact nature of the predominant source(s) and the geographical extent of the deposition are still under debate. Here, we report a century-long source apportionment of PAHs using dual (δ²H, δ¹³C) compound-specific isotope analysis on phenanthrene deposited in a lake from the Athabasca sector of the Peace Athabasca Delta situated ~150 km downstream (north) of the main center of mining operations. The isotopic signatures in the core were compared to those of the main potential sources in this region (i.e., unprocessed AOS bitumen, upgrader residual coke, forest fires, coal, gasoline and diesel soot). A significant concurrent increase (~55.0 parts per thousand) in δ²H and decrease (similar to 1.5 parts per thousand) in δ¹³C of phenanthrene over the last three decades pointed to an increasingly greater component of petcoke-derived PAHs. This study is the first to quantify long-range (i.e., >100 km) transport of a previously under-considered anthropogenic PAR source in the AOS region.

Type de document: Article
Mots-clés libres: anthracene; aromatic hydrocarbons; deforestation; impurities; isotopes; mining; oil fields; oil sands
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 avr. 2018 13:46
Dernière modification: 23 avr. 2018 13:46
URI: http://espace.inrs.ca/id/eprint/3864

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