Seasonal variation of arsenic and antimony in surface waters of small subarctic lakes impacted by legacy mining pollution near Yellowknife, NT, Canada

dc.contributor.authorPalmer, Michael J.en
dc.contributor.authorChételat, Johnen
dc.contributor.authorRichardson, Murrayen
dc.contributor.authorJamieson, Heather E.en
dc.contributor.authorGalloway, Jennifer M.en
dc.date.accessioned2019-06-07T15:39:00Z
dc.date.available2019-06-07T15:39:00Z
dc.date.issued2019-09-20
dc.descriptionThe final publication is available at Elsevier via http://dx.doi.org/10.1016/j.scitotenv.2019.05.258 ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractThe seasonal variation in lake water arsenic (As) and antimony (Sb) concentrations was assessed in four small (<1.5 km2) subarctic lakes impacted by As and Sb emissions from legacy mining activities near Yellowknife, Northwest Territories, Canada. Substantial variation in As concentrations were measured over the two-year period of study in all but the deepest lake (maximum depth 6.9 m), including a four-fold difference in As in the shallowest lake ([As]: 172–846 μg L−1; maximum depth 0.8 m). Arsenic concentrations were enriched following ice cover development in the three shallowest lakes (50–110%) through a combination of physical and biogeochemical processes. Early winter increases in As were associated with the exclusion of solutes from the developing ice-cover; and large increases in As were measured once oxygen conditions were depleted to the point of anoxia by mid-winter. The onset of anoxic conditions within the water column was associated with large increases in the concentration of redox sensitive elements in lake waters (As, iron [Fe], and manganese [Mn]), suggesting coupling of As mobility with Fe and Mn cycling. In contrast, there was little difference in Sb concentrations under ice suggesting that Sb mobility was controlled by factors other than Fe and Mn associated redox processes. A survey of 30 lakes in the region during fall (open-water) and late-winter (under-ice) revealed large seasonal differences in surface water As were more common in lakes with a maximum depth <4 m. This threshold highlights the importance of winter conditions and links between physical lake properties and biogeochemical processes in the chemical recovery of As-impacted subarctic landscapes. The findings indicate annual remobilization of As from contaminated lake sediments may be inhibiting recovery in small shallow lakes that undergo seasonal transitions in redox state.en
dc.description.sponsorshipNWT Cumulative Impact Monitoring Program: 192en
dc.description.sponsorshipNSERCNSERC: 2015-03846, 2018-05331en
dc.description.sponsorshipW. Garfield Weston Northern Research Awarden
dc.identifier.citationPalmer, M. J., Chételat, J., Richardson, M., Jamieson, H. E., & Galloway, J. M. (2019). Seasonal variation of arsenic and antimony in surface waters of small subarctic lakes impacted by legacy mining pollution near Yellowknife, NT, Canada. Science of The Total Environment, 684, 326–339. doi:10.1016/j.scitotenv.2019.05.258en
dc.identifier.doihttps://dx.doi.org/10.1016/j.scitotenv.2019.05.258
dc.identifier.urihttp://hdl.handle.net/1974/26293
dc.publisherElsevieren
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAntimonyen
dc.subjectArsenicen
dc.subjectCryoconcentrationen
dc.subjectSeasonalityen
dc.subjectSediment effluxen
dc.subjectSubarctic lakesen
dc.titleSeasonal variation of arsenic and antimony in surface waters of small subarctic lakes impacted by legacy mining pollution near Yellowknife, NT, Canadaen
dc.typejournal articleen
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