Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale
Shales are increasingly being exploited for oil and unconventional gas. Exploitation of sub-arctic oil shales requires the creation of gravel pads to elevate workings above the heaving effects of ground ice. These gravel pads can potentially generate acidic leachate, which can enhance the mobility o...
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Language: | English |
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2014
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Online Access: | https://researchers.mq.edu.au/en/publications/aef9132e-a162-4079-baca-f75e11a9de49 https://doi.org/10.3390/min4020293 https://research-management.mq.edu.au/ws/files/62198297/Publisher%20version%20(open%20access).pdf http://www.scopus.com/inward/record.url?scp=84937553285&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/LP0776373 http://purl.org/au-research/grants/arc/LE0989539 |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/aef9132e-a162-4079-baca-f75e11a9de49 2023-05-15T14:24:42+02:00 Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale Mumford, Kathryn A. Pitt, Brendan Townsend, Ashley T. Snape, Ian Gore, Damian B. 2014-06 application/pdf https://researchers.mq.edu.au/en/publications/aef9132e-a162-4079-baca-f75e11a9de49 https://doi.org/10.3390/min4020293 https://research-management.mq.edu.au/ws/files/62198297/Publisher%20version%20(open%20access).pdf http://www.scopus.com/inward/record.url?scp=84937553285&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/LP0776373 http://purl.org/au-research/grants/arc/LE0989539 eng eng info:eu-repo/semantics/openAccess Mumford , K A , Pitt , B , Townsend , A T , Snape , I & Gore , D B 2014 , ' Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale ' , Minerals , vol. 4 , no. 2 , pp. 293-312 . https://doi.org/10.3390/min4020293 Acid rock drainage Metal concentration Oxidation reduction potential PH Total reflection X-ray fluorescence spectrometry (TRXRF) article 2014 ftmacquarieunicr https://doi.org/10.3390/min4020293 2022-11-06T06:44:12Z Shales are increasingly being exploited for oil and unconventional gas. Exploitation of sub-arctic oil shales requires the creation of gravel pads to elevate workings above the heaving effects of ground ice. These gravel pads can potentially generate acidic leachate, which can enhance the mobility of metals from the shale. To examine this potential, pyrite-bearing shale originating from sub-Arctic gravel pad sites were subjected to leaching tests for 600 days at initial pH values ranging from 2 to 5, to simulate potential real world conditions. At set times over the 600 day experiment, pH, oxidation reduction potential (ORP), dissolved oxygen and temperature were recorded and small liquid samples withdrawn and analysed for elemental concentrations using total reflection X-ray fluorescence spectrometry (TRXRF). Six of eight shale samples were found to be acid generating, with pH declining and ORP becoming increasingly positive after 100 days. Two of the eight shale samples produced increasingly alkaline leachate conditions with relatively low ORP after 100 days, indicating an inbuilt buffering capacity. By 600 days the buffering capacity of all samples had been consumed and all leachate samples were acidic. TRXRF analyses demonstrated significant potential for the leaching of S, Fe, Ni, Cu, Zn and Mn with greatest concentrations found in reaction vessels with most acidic pH and highest ORP. Article in Journal/Newspaper Arctic Arctic Macquarie University Research Portal Arctic Minerals 4 2 293 312 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Acid rock drainage Metal concentration Oxidation reduction potential PH Total reflection X-ray fluorescence spectrometry (TRXRF) |
spellingShingle |
Acid rock drainage Metal concentration Oxidation reduction potential PH Total reflection X-ray fluorescence spectrometry (TRXRF) Mumford, Kathryn A. Pitt, Brendan Townsend, Ashley T. Snape, Ian Gore, Damian B. Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
topic_facet |
Acid rock drainage Metal concentration Oxidation reduction potential PH Total reflection X-ray fluorescence spectrometry (TRXRF) |
description |
Shales are increasingly being exploited for oil and unconventional gas. Exploitation of sub-arctic oil shales requires the creation of gravel pads to elevate workings above the heaving effects of ground ice. These gravel pads can potentially generate acidic leachate, which can enhance the mobility of metals from the shale. To examine this potential, pyrite-bearing shale originating from sub-Arctic gravel pad sites were subjected to leaching tests for 600 days at initial pH values ranging from 2 to 5, to simulate potential real world conditions. At set times over the 600 day experiment, pH, oxidation reduction potential (ORP), dissolved oxygen and temperature were recorded and small liquid samples withdrawn and analysed for elemental concentrations using total reflection X-ray fluorescence spectrometry (TRXRF). Six of eight shale samples were found to be acid generating, with pH declining and ORP becoming increasingly positive after 100 days. Two of the eight shale samples produced increasingly alkaline leachate conditions with relatively low ORP after 100 days, indicating an inbuilt buffering capacity. By 600 days the buffering capacity of all samples had been consumed and all leachate samples were acidic. TRXRF analyses demonstrated significant potential for the leaching of S, Fe, Ni, Cu, Zn and Mn with greatest concentrations found in reaction vessels with most acidic pH and highest ORP. |
format |
Article in Journal/Newspaper |
author |
Mumford, Kathryn A. Pitt, Brendan Townsend, Ashley T. Snape, Ian Gore, Damian B. |
author_facet |
Mumford, Kathryn A. Pitt, Brendan Townsend, Ashley T. Snape, Ian Gore, Damian B. |
author_sort |
Mumford, Kathryn A. |
title |
Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
title_short |
Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
title_full |
Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
title_fullStr |
Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
title_full_unstemmed |
Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale |
title_sort |
long-term acid-generating and metal leaching potential of a sub-arctic oil shale |
publishDate |
2014 |
url |
https://researchers.mq.edu.au/en/publications/aef9132e-a162-4079-baca-f75e11a9de49 https://doi.org/10.3390/min4020293 https://research-management.mq.edu.au/ws/files/62198297/Publisher%20version%20(open%20access).pdf http://www.scopus.com/inward/record.url?scp=84937553285&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/LP0776373 http://purl.org/au-research/grants/arc/LE0989539 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_source |
Mumford , K A , Pitt , B , Townsend , A T , Snape , I & Gore , D B 2014 , ' Long-term acid-generating and metal leaching potential of a sub-Arctic oil shale ' , Minerals , vol. 4 , no. 2 , pp. 293-312 . https://doi.org/10.3390/min4020293 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3390/min4020293 |
container_title |
Minerals |
container_volume |
4 |
container_issue |
2 |
container_start_page |
293 |
op_container_end_page |
312 |
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1766297140807598080 |