Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate
Arsenic (As) is commonly sequestered at the sediment–water interface (SWI) in mining-impacted lakes through adsorption and/or co-precipitation with authigenic iron (Fe)-(oxy)hydroxides or sulfides. The results of this study demonstrate that the accumulation of organic matter (OM) in near-surface sed...
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ftunivtasmania:oai:eprints.utas.edu.au:45852 2023-05-15T14:26:55+02:00 Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate Miller, CB Parsons, MiB Jamieson, HE Ardakani, OH Patterson, RT Galloway, JM 2022 https://eprints.utas.edu.au/45852/ unknown Springer Miller, CB orcid:0000-0003-3241-0314 , Parsons, MiB, Jamieson, HE, Ardakani, OH, Patterson, RT and Galloway, JM 2022 , 'Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate' , Environmental Earth Sciences, vol. 81, no. 4 , pp. 1-20 , doi:10.1007/s12665-022-10213-2 <http://dx.doi.org/10.1007/s12665-022-10213-2>. arsenic speciation mine waste climate change contaminant mobility environmental monitoring Article PeerReviewed 2022 ftunivtasmania https://doi.org/10.1007/s12665-022-10213-2 2022-05-23T22:16:35Z Arsenic (As) is commonly sequestered at the sediment–water interface (SWI) in mining-impacted lakes through adsorption and/or co-precipitation with authigenic iron (Fe)-(oxy)hydroxides or sulfides. The results of this study demonstrate that the accumulation of organic matter (OM) in near-surface sediments also influences the mobility and fate of As in sub-Arctic lakes. Sediment gravity cores, sediment grab samples, and porewaters were collected from three lakes downstream of the former Tundra gold mine, Northwest Territories, Canada. Analysis of sediment using combined micro-X-ray fluorescence/diffraction, K-edge X-ray Absorption Near-Edge Structure (XANES), and organic petrography shows that As is associated with both aquatic (benthic and planktonic alginate) and terrestrially derived OM (e.g., cutinite, funginite). Most As is hosted by fine-grained Fe-(oxy)hydroxides or sulfide minerals (e.g., goethite, orpiment, lepidocrocite, and mackinawite); however, grain-scale synchrotron-based analysis shows that As is also associated with amorphous OM. Mixed As oxidation states in porewater (median = 62% As (V), 18% As (III); n = 20) and sediment (median = 80% As (-I) and (III), 20% As (V); n = 9) indicate the presence of variable redox conditions in the near-surface sediment and suggest that post-depositional remobilization of As has occurred. Detailed characterization of As-bearing OM at and below the SWI suggests that OM plays an important role in stabilizing redox-sensitive authigenic minerals and associated As. Based on these findings, it is expected that increased concentrations of labile OM will drive post-depositional surface enrichment of As in mining-impacted lakes and may increase or decrease As flux from sediments to overlying surface waters. Article in Journal/Newspaper Arctic Arctic Climate change Northwest Territories Tundra University of Tasmania: UTas ePrints Arctic Northwest Territories Canada Environmental Earth Sciences 81 4 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
arsenic speciation mine waste climate change contaminant mobility environmental monitoring |
spellingShingle |
arsenic speciation mine waste climate change contaminant mobility environmental monitoring Miller, CB Parsons, MiB Jamieson, HE Ardakani, OH Patterson, RT Galloway, JM Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
topic_facet |
arsenic speciation mine waste climate change contaminant mobility environmental monitoring |
description |
Arsenic (As) is commonly sequestered at the sediment–water interface (SWI) in mining-impacted lakes through adsorption and/or co-precipitation with authigenic iron (Fe)-(oxy)hydroxides or sulfides. The results of this study demonstrate that the accumulation of organic matter (OM) in near-surface sediments also influences the mobility and fate of As in sub-Arctic lakes. Sediment gravity cores, sediment grab samples, and porewaters were collected from three lakes downstream of the former Tundra gold mine, Northwest Territories, Canada. Analysis of sediment using combined micro-X-ray fluorescence/diffraction, K-edge X-ray Absorption Near-Edge Structure (XANES), and organic petrography shows that As is associated with both aquatic (benthic and planktonic alginate) and terrestrially derived OM (e.g., cutinite, funginite). Most As is hosted by fine-grained Fe-(oxy)hydroxides or sulfide minerals (e.g., goethite, orpiment, lepidocrocite, and mackinawite); however, grain-scale synchrotron-based analysis shows that As is also associated with amorphous OM. Mixed As oxidation states in porewater (median = 62% As (V), 18% As (III); n = 20) and sediment (median = 80% As (-I) and (III), 20% As (V); n = 9) indicate the presence of variable redox conditions in the near-surface sediment and suggest that post-depositional remobilization of As has occurred. Detailed characterization of As-bearing OM at and below the SWI suggests that OM plays an important role in stabilizing redox-sensitive authigenic minerals and associated As. Based on these findings, it is expected that increased concentrations of labile OM will drive post-depositional surface enrichment of As in mining-impacted lakes and may increase or decrease As flux from sediments to overlying surface waters. |
format |
Article in Journal/Newspaper |
author |
Miller, CB Parsons, MiB Jamieson, HE Ardakani, OH Patterson, RT Galloway, JM |
author_facet |
Miller, CB Parsons, MiB Jamieson, HE Ardakani, OH Patterson, RT Galloway, JM |
author_sort |
Miller, CB |
title |
Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
title_short |
Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
title_full |
Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
title_fullStr |
Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
title_full_unstemmed |
Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate |
title_sort |
mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-arctic lakes: implications for environmental monitoring in a warming climate |
publisher |
Springer |
publishDate |
2022 |
url |
https://eprints.utas.edu.au/45852/ |
geographic |
Arctic Northwest Territories Canada |
geographic_facet |
Arctic Northwest Territories Canada |
genre |
Arctic Arctic Climate change Northwest Territories Tundra |
genre_facet |
Arctic Arctic Climate change Northwest Territories Tundra |
op_relation |
Miller, CB orcid:0000-0003-3241-0314 , Parsons, MiB, Jamieson, HE, Ardakani, OH, Patterson, RT and Galloway, JM 2022 , 'Mediation of arsenic mobility by organic matter in mining-impacted sediment from sub-Arctic lakes: implications for environmental monitoring in a warming climate' , Environmental Earth Sciences, vol. 81, no. 4 , pp. 1-20 , doi:10.1007/s12665-022-10213-2 <http://dx.doi.org/10.1007/s12665-022-10213-2>. |
op_doi |
https://doi.org/10.1007/s12665-022-10213-2 |
container_title |
Environmental Earth Sciences |
container_volume |
81 |
container_issue |
4 |
_version_ |
1766300389793071104 |