Arsenic removal from contaminated brackish sea water by sorption onto Al hydroxides and Fe phases mobilized by land-use

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Arsenic removal from contaminated brackish sea water by sorption onto Al hydroxides and Fe phases mobilized by land-use

Yu, Changxun (author): Linnéuniversitetet,Institutionen för biologi och miljö (BOM)

Peltola, Pasi (author): Linnéuniversitetet,Institutionen för biologi och miljö (BOM)

Nystrand, Miriam I. (author): Åbo Akad Univ, Finland

Virtasalo, Joonas J. (author): Geol Survey Finland GTK, Finland

Österholm, Peter (author): Åbo Akad Univ, Finland

Ojala, Antti E. K. (author): Geol Survey Finland GTK, Finland

Hogmalm, Johan, 1979 (author): Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences

Åström, Mats E. (author): Linnéuniversitetet,Institutionen för biologi och miljö (BOM)

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Elsevier BV, 2016
2016
English.
In: Science of the Total Environment. - : Elsevier BV. - 0048-9697 .- 1879-1026. ; 542, s. 923-934

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; https://gup.ub.gu.se...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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.

Subject headings

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

Arsenic
Estuarine sediments
The Bothnian Bay
Ronnskar smelter
Acid sulfate soils
Miljövetenskap
Environmental Science
Acid sulfate soils
Arsenic
Estuarine sediments
Rönnskär smelter
The Bothnian Bay

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By the author/editor: Yu, Changxun; Peltola, Pasi; Nystrand, Miriam ...; Virtasalo, Joona ...; Österholm, Peter; Ojala, Antti E. ...; show more...; Hogmalm, Johan, ...; Åström, Mats E.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

Articles in the publication: Science of the T ...

By the university: Linnaeus University; University of Gothenburg

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