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dc.contributor.authorDoig, Lorne E
dc.contributor.authorCarr, Meghan K
dc.contributor.authorMeissner, Anna GN
dc.contributor.authorJardine, Tim D
dc.contributor.authorJones, Paul D
dc.contributor.authorBharadwaj, Lalita
dc.contributor.authorLindenschmidt, Karl-Erich
dc.date.accessioned2021-10-12T06:56:47Z
dc.date.available2021-10-12T06:56:47Z
dc.date.issued2017
dc.identifier.issn0730-7268
dc.identifier.doi10.1002/etc.3886
dc.identifier.urihttp://hdl.handle.net/10072/408934
dc.description.abstractAcross the circumpolar world, intensive anthropogenic activities in the southern reaches of many large, northward-flowing rivers can cause sediment contamination in the downstream depositional environment. The influence of ice cover on concentrations of inorganic contaminants in bed sediment (i.e., sediment quality) is unknown in these rivers, where winter is the dominant season. A geomorphic response unit approach was used to select hydraulically diverse sampling sites across a northern test-case system, the Slave River and delta (Northwest Territories, Canada). Surface sediment samples (top 1 cm) were collected from 6 predefined geomorphic response units (12 sites) to assess the relationships between bed sediment physicochemistry (particle size distribution and total organic carbon content) and trace element content (mercury and 18 other trace elements) during open-water conditions. A subset of sites was resampled under-ice to assess the influence of season on these relationships and on total trace element content. Concentrations of the majority of trace elements were strongly correlated with percent fines and proxies for grain size (aluminum and iron), with similar trace element grain size/grain size proxy relationships between seasons. However, finer materials were deposited under ice with associated increases in sediment total organic carbon content and the concentrations of most trace elements investigated. The geomorphic response unit approach was effective at identifying diverse hydrological environments for sampling prior to field operations. Our data demonstrate the need for under-ice sampling to confirm year-round consistency in trace element–geochemical relationships in fluvial systems and to define the upper extremes of these relationships. Whether contaminated or not, under-ice bed sediment can represent a “worst-case” scenario in terms of trace element concentrations and exposure for sediment-associated organisms in northern fluvial systems.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherJohn Wiley & Sons
dc.relation.ispartofpagefrom2916
dc.relation.ispartofpageto2924
dc.relation.ispartofissue11
dc.relation.ispartofjournalEnvironmental Toxicology and Chemistry
dc.relation.ispartofvolume36
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode31
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsEnvironmental Sciences
dc.subject.keywordsToxicology
dc.subject.keywordsEnvironmental Sciences & Ecology
dc.titleOpen-water and under-ice seasonal variations in trace element content and physicochemical associations in fluvial bed sediment
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationDoig, LE; Carr, MK; Meissner, AGN; Jardine, TD; Jones, PD; Bharadwaj, L; Lindenschmidt, K-E, Open-water and under-ice seasonal variations in trace element content and physicochemical associations in fluvial bed sediment, Environmental Toxicology and Chemistry, 2017, 36 (11), pp. 2916-2924
dcterms.dateAccepted2017-06-12
dc.date.updated2021-10-12T06:54:54Z
gro.hasfulltextNo Full Text
gro.griffith.authorJardine, Timothy


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