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Distribution and dispersal of metals in contaminated fibrous sediments of industrial origin
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling. Geological Survey of Sweden.ORCID-id: 0000-0001-6444-3968
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.
Swedish Geotechnical Institute (SGI).
Geological Survey of Sweden (SGU).
(Engelska)Ingår i: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298Artikel i tidskrift (Refereegranskat) Submitted
Nyckelord [en]
Fiberbank, fiber-rich sediments, metals, bottom water, pore water, dispersal, sorption
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-349805OAI: oai:DiVA.org:uu-349805DiVA, id: diva2:1202921
Projekt
TREASURE
Forskningsfinansiär
Forskningsrådet Formas, 214-2014-63Sveriges Geologiska Undersökning (SGU), 362-1493/2013Sveriges Geologiska Undersökning (SGU), 411-1578/2013Tillgänglig från: 2018-05-02 Skapad: 2018-05-02 Senast uppdaterad: 2018-05-02
Ingår i avhandling
1. Dispersal and environmental impact of contaminants in organic rich, fibrous sediments of industrial origin in the Baltic Sea
Öppna denna publikation i ny flik eller fönster >>Dispersal and environmental impact of contaminants in organic rich, fibrous sediments of industrial origin in the Baltic Sea
2018 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Department of Earth Sciences, 2018. s. 53
Nyckelord
Fiberbank, fiber-rich sediments, metals, persistent organic pollutants, pore water, bottom water, dispersal, sorption, pulp and paper
Nationell ämneskategori
Geovetenskap och miljövetenskap Miljövetenskap
Forskningsämne
Naturresurser och hållbar utveckling
Identifikatorer
urn:nbn:se:uu:diva-349826 (URN)
Presentation
2018-06-07, Norrland I (Gm118), Villavägen 16, Uppsala, 13:00 (Engelska)
Opponent
Handledare
Projekt
TREASURE
Forskningsfinansiär
Forskningsrådet Formas, 214-2014-63Sveriges Geologiska Undersökning (SGU), 362-1493/2013Sveriges Geologiska Undersökning (SGU), 411-1578/2013
Tillgänglig från: 2018-05-29 Skapad: 2018-05-02 Senast uppdaterad: 2018-05-29Bibliografiskt granskad

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