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Geochemical control processes and potential sediment toxicity in a mine-impacted lake
Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute, Centre for Climate Science and Policy Research .
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Norwegian University of Science and Technology, Norway.
2016 (English)In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 35, no 3, 563-572 p.Article in journal (Refereed) PublishedText
Abstract [en]

Geochemical parameters and major ion concentrations from sediments of a freshwater lake in the town of angstrom tvidaberg, southeastern, Sweden, were used to identify the geochemical processes that control the water chemistry. The lake sediments are anoxic, characterized by reduced sulfur and sulfidic minerals. The hypothesis tested is that in sulfidic-anaerobic contaminated sediments, the presence of redox potential changes creates a favorable condition for sulfide oxidation, resulting in the release of potentially toxic metals. The acid volatile sulfide (AVS) contents ranged from 5.5mol/g to 16mol/g of dry sediment. Comparison of total mine tailing metals (Sigma mine tailing metals) with simultaneously extracted metals (SEM) in sediments indicates that up to 20% of the Sigma mine tailing metals are bound to the solid phase as AVS. Consequently, the AVS and SEM analysis classified all sediment samples as potentially toxic in terms of heavy metal concentrations (i.e., SEM to AVS ratio distribution>1). Evaluation of hydrogeochemical data suggests that calcite dissolution, iron (III) oxyhydroxysulfate mineral jarosite (H-jarosite) precipitation, hematite precipitation, and siderite precipitation are the most prevailing geochemical processes that control the geochemical interactions between the water column and sediment in a mine-impacted lake. The geochemical processes were verified and quantified using a chemical equilibrium modeling program, Visual MINTEQ, Ver 3.1, beta. The identified geochemical processes create an environment in which the characteristics of sulfate-rich waters and acidic-iron produce the geochemical conditions for acid mine drainage and mobilization of toxic metals. (c) 2015 SETAC

Place, publisher, year, edition, pages
WILEY-BLACKWELL , 2016. Vol. 35, no 3, 563-572 p.
Keyword [en]
Geochemical processes; Heavy metals; Sediment toxicity; Sulfide; Acid mine drainage
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:liu:diva-126816DOI: 10.1002/etc.3224ISI: 000371505800006PubMedID: 26313659OAI: oai:DiVA.org:liu-126816DiVA: diva2:917704
Note

Funding Agencies|Department of Thematic Studies - Environmental Change, Linkoping University, Sweden

Available from: 2016-04-07 Created: 2016-04-05 Last updated: 2016-04-07

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