UMR CNRS 5805 EPOC
Environnements et Paléoenvironnements
Océaniques et Continentaux

        

Consignes de Sécurité et Numéros d'Urgence
(à l'usage des personnels du laboratoire)

le 16-05-2011 à 17:00

Lieu Amphithéâtre D, Bâtiment A29, Université de Bordeaux Intervenant(s) Céline Guéguen, Département de chimie, Université de Trent, Canada

The Alberta's oil sands deposits are located in the boreal forest, a sensitive and critical region for carbon storage and climate regulation. Over the past years, Athabasca oil sands development has been intensified and presents new challenges for the environmental management. At present, crude oil production from oil sands account for more than 25% of the Canada's annual oil production and is expected to rise to over 50% in the next few years. Despite tar sand deposits contain large amounts of heavy metals, little is known on their potential impacts on the natural biogeochemical cycles in natural waters. In this study, in situ passive samplers have been deployed to assess the effects of the oil sands industry on metal lability. Preliminary results showed the 8-fold increase in dissolved organic matter near development induced a rapid decrease in DGT-labile metals. These results suggest that environmental conditions near oil sand development have significantly affected metal speciation.