Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada
Nickel (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 deposit...
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2018
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fttriple:oai:gotriple.eu:oai:doaj.org/article:1ac8d68ddd5042baa9a39be742757618 2023-05-15T16:17:39+02:00 Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada Jake A. Nesbitt Jared M. Robertson Lawrence A. Swerhone Matthew B. J. Lindsay 2018-04-01 https://doi.org/10.1139/facets-2017-0115 https://doaj.org/article/1ac8d68ddd5042baa9a39be742757618 en eng Canadian Science Publishing doi:10.1139/facets-2017-0115 2371-1671 https://doaj.org/article/1ac8d68ddd5042baa9a39be742757618 undefined FACETS, Vol 3, Pp 469-486 (2018) oil sands petroleum coke nickel geochemistry envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.1139/facets-2017-0115 2023-01-22T19:13:54Z Nickel (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−1 (median 7.8 μg·L−1) 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. Article in Journal/Newspaper Fort McMurray Unknown Canada Fort McMurray FACETS 3 1 469 486 |
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English |
topic |
oil sands petroleum coke nickel geochemistry envir geo |
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oil sands petroleum coke nickel geochemistry envir geo Jake A. Nesbitt Jared M. Robertson Lawrence A. Swerhone Matthew B. J. Lindsay Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
topic_facet |
oil sands petroleum coke nickel geochemistry envir geo |
description |
Nickel (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−1 (median 7.8 μg·L−1) 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. |
format |
Article in Journal/Newspaper |
author |
Jake A. Nesbitt Jared M. Robertson Lawrence A. Swerhone Matthew B. J. Lindsay |
author_facet |
Jake A. Nesbitt Jared M. Robertson Lawrence A. Swerhone Matthew B. J. Lindsay |
author_sort |
Jake A. Nesbitt |
title |
Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
title_short |
Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
title_full |
Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
title_fullStr |
Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
title_full_unstemmed |
Nickel geochemistry of oil sands fluid petroleum coke deposits, Alberta, Canada |
title_sort |
nickel geochemistry of oil sands fluid petroleum coke deposits, alberta, canada |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
https://doi.org/10.1139/facets-2017-0115 https://doaj.org/article/1ac8d68ddd5042baa9a39be742757618 |
geographic |
Canada Fort McMurray |
geographic_facet |
Canada Fort McMurray |
genre |
Fort McMurray |
genre_facet |
Fort McMurray |
op_source |
FACETS, Vol 3, Pp 469-486 (2018) |
op_relation |
doi:10.1139/facets-2017-0115 2371-1671 https://doaj.org/article/1ac8d68ddd5042baa9a39be742757618 |
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undefined |
op_doi |
https://doi.org/10.1139/facets-2017-0115 |
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FACETS |
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3 |
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1 |
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469 |
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486 |
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1766003539045253120 |