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Arsenic removal from contaminated brackish sea water by sorption onto Al hydroxides and Fe phases mobilized by land-use
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-0635-3718
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Åbo Akad Univ, Finland.
Geol Survey Finland GTK, Finland.
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2016 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 542, p. 923-934Article in journal (Refereed) Published
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Abstract [en]

This study examines the spatial and temporal distribution patterns of arsenic (As) in solid and aqueous materials along the mixing zone of an estuary, located in the south-eastern part of the Bothnian Bay and fed by a creek running through an acid sulfate (AS) soil landscape. The concentrations of As in solution form (<1 kDa) increase steadily from the creek mouth to the outer estuary, suggesting that inflowing seawater, rather than AS soil, is the major As source in the estuary. In sediments at the outer estuary, As was accumulated and diagenetically cycled in the surficial layers, as throughout much of the Bothnian Bay. In contrast, in sediments in the inner estuary, As concentrations and accumulation rates showed systematical peaks at greater depths. These peaks were overall consistent with the temporal trend of past As discharges from the Ronnskar smelter and the accompanied As concentrations in past sea-water of the Bothnian Bay, pointing to a connection between the historical smelter activities and the sediment-bound As in the inner estuary. However, the concentrations and accumulation rates of As peaked at depths where the smelter activities had already declined, but a large increase in the deposition of Al hydroxides and Fe phases occurred in response to intensified land-use in the mid 1960's and early 1970's. This correspondence suggests that, apart from the inflowing As-contaminated seawater, capture by Al hydroxides, Fe hydroxides and Fe-organic complexes is another important factor for As deposition in the inner estuary. After accumulating in the sediment, the solid-phase As was partly remobilized, as reflected by increased pore-water As concentrations, a process favored by As(V) reduction and high concentrations of dissolved organic matter. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2016. Vol. 542, p. 923-934
Keywords [en]
Arsenic, Estuarine sediments, The Bothnian Bay, Ronnskar smelter, Acid sulfate soils
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-48801DOI: 10.1016/j.scitotenv.2015.11.013ISI: 000365602100093PubMedID: 26558848Scopus ID: 2-s2.0-84946616230OAI: oai:DiVA.org:lnu-48801DiVA, id: diva2:895973
Available from: 2016-01-20 Created: 2016-01-15 Last updated: 2017-12-08Bibliographically approved

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Yu, ChangxunPeltola, PasiÅström, Mats E.

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