Repository logo
HARVEST
 

Vanadium geochemistry of oil sands fluid petroleum coke

Simple item page
dc.contributor.authorNesbitt, Jake A.
dc.contributor.authorLindsay, Matthew B. J.
dc.date.accessioned2019-09-27T01:31:13Z
dc.date.available2019-09-27T01:31:13Z
dc.date.issued2017-02-09
dc.description.abstractVanadium has previously been linked to elevated toxicity of leachates derived from oil sands petroleum coke. However, geochemical controls on V mobility within coke deposits remain poorly constrained. Detailed examinations of pore-water and solid-phase V geochemistry were, therefore, performed on oil sands fluid petroleum coke deposits in Alberta, Canada. Sample collection focused on both active and reclaimed deposits, which contained more than 3 × 10⁷ m³ of fluid petroleum coke. Dissolved V concentrations were highest (up to 3.0 mg/Lˉ¹) immediately below the water table, but decreased rapidly with increasing depth. This trend corresponded to a transition from mildly acidic (pH 6 – 7) and oxic conditions to mildly alkaline (pH 7 – 8.5) and anoxic conditions. Scanning electron microscopy (SEM), electron microprobe analysis (EMPA) and micro-X-ray fluorescence (µXRF) mapping revealed coke particles exhibited an internal structure characterized by successive concentric layers. The outer margins of these layers were characterized by elevated V, Fe, Si, and Al concentrations, indicating the presence of inorganic phases. Micro-X-ray absorption near-edge structure (μXANES) spectroscopy revealed that V speciation was dominated by V(IV) porphyrins except at outer margins of layers, where octahedrally-coordinated V(III) was a major component. Minor to trace V(V) was also detected within fluid petroleum coke particles.en_US
dc.description.sponsorshipNSERC Grant No. IRCPJ-450684-13en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationNesbitt, J.A. & Lindsay, M.B.J. (2017). Vanadium geochemistry of oil sands fluid petroleum coke. Environmental Science and Technology, 51: 3102–3109. https://doi.org/10.1021/acs.est.6b05682en_US
dc.identifier.issn15205851
dc.identifier.urihttp://hdl.handle.net/10388/12380
dc.language.isoenen_US
dc.publisherAmerican Chemical Societyen_US
dc.subjectvanadiumen_US
dc.subjectgeochemistryen_US
dc.subjectpetroleum cokeen_US
dc.subjectgroundwateren_US
dc.subjectredox processesen_US
dc.subjectX-ray absorption spectroscopyen_US
dc.titleVanadium geochemistry of oil sands fluid petroleum cokeen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Nesbitt and Lindsay (2015) Environ Sci Technol - post-print.pdf
Size:
1011.96 KB
Format:
Adobe Portable Document Format
Description:
Article
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.28 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Geological Sciences