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Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada

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dc.contributor.authorNesbitt, Jake A.
dc.contributor.authorRobertson, Jared M.
dc.contributor.authorSwerhone, Lawrence A.
dc.contributor.authorLindsay, Matthew B. J.
dc.date.accessioned2019-09-26T22:15:41Z
dc.date.available2019-09-26T22:15:41Z
dc.date.issued2018-04-30
dc.description.abstractNickel (Ni) leaching from oil sands petroleum coke can have toxicological effects on aquatic organisms. However, geochemical controls on Ni release, transport and attenuation within coke deposits remains limited. We examined the geochemistry of fluid coke and associated pore-waters from two deposits at an oil sands mine near Fort McMurray, Alberta, Canada. Synchrotron-based micro-X-ray fluorescence (µXRF) and micro-X-ray absorption near edge structure (µXANES) spectroscopy show that Ni(II)-porphyrin complexes dominate, but inorganic phases including Ni(II)-sulfide and Ni(II)-oxide comprise a minor component of fluid coke. Sequential chemical extractions suggested that sorption-desorption reactions may influence Ni mobility within fluid coke deposits. Although only a small proportion of total Ni (< 4%) is susceptible to leaching under environmentally-relevant concentrations, dissolved Ni concentrations (n = 65) range from 2 to 120 μg/L (median 7.8 μg/L) within the two deposits and generally decrease with depth below the water table. Pore-water Ni concentrations are negatively correlated with pH, but not with dissolved sulfate, bicarbonate, or chloride. Overall, our findings suggest that pore-water pH and sorption-desorption reactions are principal controls on dissolved Ni concentrations within oil sands fluid petroleum coke deposits.en_US
dc.description.sponsorshipNSERC Grant No. IRCPJ-450684-13; NSERC Grant No. CREAT-449124-2014en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationNesbitt, J.A., Robertson, J.M., Swerhone, L.A. & Lindsay, M.B.J. (2018). Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada. FACETS, 3, 469–486. https://doi.org/10.1139/facets-2017-0115en_US
dc.identifier.issn2371-1671
dc.identifier.urihttp://hdl.handle.net/10388/12375
dc.language.isoenen_US
dc.publisherCanadian Science Publishingen_US
dc.subjectX-ray absorption spectroscopyen_US
dc.subjectgeochemistryen_US
dc.subjectnickelen_US
dc.subjectoil sandsen_US
dc.subjectpetroleum cokeen_US
dc.titleNickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canadaen_US
dc.typeArticleen_US

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