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Persistent organic pollutants in wood fiber contaminated sediments from the Baltic Sea
Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU).
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Natural Resources and Sustainable Development. Geological Survey of Sweden.ORCID iD: 0000-0001-6444-3968
Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU).
Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU).
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(English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851Article in journal (Refereed) Submitted
Keywords [en]
Chlorinated pollutants, organic carbon, fibrous sediment, pore water, pulp and paper emissions.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-349824OAI: oai:DiVA.org:uu-349824DiVA, id: diva2:1202945
Funder
Swedish Research Council Formas, 214-2014-63Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-05-02
In thesis
1. Dispersal and environmental impact of contaminants in organic rich, fibrous sediments of industrial origin in the Baltic Sea
Open this publication in new window or tab >>Dispersal and environmental impact of contaminants in organic rich, fibrous sediments of industrial origin in the Baltic Sea
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The health of the Baltic Sea is negatively affected by hazardous substances such as metals and persistent organic pollutants (POPs), which include legacy pollutants that were banned decades ago, but still circulate in the ecosystem. Elevated levels of legacy pollutants, identified by HELCOM as key hazardous substances, have been found in accumulations of fibrous sediments, so-called fiberbanks and fiber-rich sediments, which derive from old pulp mills along the Swedish north coast. The fiberbanks are deposited in shallow water and bathymetrical models show evidence of their erosion, potentially caused by propeller wash, submarine landslides and gas ebullition. This thesis addresses the potential dispersal of key substances from three fiberbank sites located in a non-tidal Swedish estuary, in which metals and POPs are present in concentrations that may pose a risk for benthic organisms. Metals and POPs are partitioned to organic material and, as expected, show the highest partitioning coefficients (KD) in fiberbanks that have higher TOC levels compared to adjacent areas with fiber-rich sediments (natural clay sediments mixed up with fibers) or relatively unaffected postglacial clays. However, many analytes were found to be present in quantifiable concentrations in pore water, which indicates diffusion of substances from the solid phase to the aqueous phase. To assess the dispersive influence of an abrupt erosional event on dispersion, metals were measured in undisturbed bottom water and in bottom water disturbed by artificial re-suspension of fibrous sediments. The bioavailable, dissolved fraction of metals decreased in bottom water after re-suspension, probably due to the particle concentration effect. In contrast, the total concentrations of metals and number of quantifiable metals increased with particle concentration caused by re-suspension. At one station, the total concentration of chromium (Cr) was elevated to a level where it may lower the ecological status of the water body during periods of substantial erosion (e.g. spring floods or submarine landslides). Analyses of disturbed bottom water revealed, however, that minerogenic particles were preferentially re-suspended compared to organic. This suggests that physical erosion and re-suspension of fiberbank sediments might have a larger effect on dispersal of metals than on POPs.

Place, publisher, year, edition, pages
Uppsala: Department of Earth Sciences, 2018. p. 53
Keywords
Fiberbank, fiber-rich sediments, metals, persistent organic pollutants, pore water, bottom water, dispersal, sorption, pulp and paper
National Category
Earth and Related Environmental Sciences Environmental Sciences
Research subject
Natural Resources and Sustainable Development
Identifiers
urn:nbn:se:uu:diva-349826 (URN)
Presentation
2018-06-07, Norrland I (Gm118), Villavägen 16, Uppsala, 13:00 (English)
Opponent
Supervisors
Projects
TREASURE
Funder
Swedish Research Council Formas, 214-2014-63The Geological Survey of Sweden (SGU), 362-1493/2013The Geological Survey of Sweden (SGU), 411-1578/2013
Available from: 2018-05-29 Created: 2018-05-02 Last updated: 2018-05-29Bibliographically approved

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