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Point source influences on the carbon and nitrogen geochemistry of sediments in the Stockholm inner archipelago, Sweden
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
2006 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 366, no 1, 337-349 p.Article in journal (Refereed) Published
Abstract [en]

This study reports analyses of carbon and nitrogen content, and δ15N and δ13C in sediments of the Höggarnsfjärden Bay near Stockholm. Samples have been taken upstream, near, and downstream of a point source of processed leach water from a garbage dump. The surface sediment at the upstream and downstream sites has δ15N and δ13C close to the expected background of the area, even though a contribution from the leach water can be observed downstream of the point source. The sediment close to the outflow is strongly influenced by the carbon and nitrogen in the leach water.

Place, publisher, year, edition, pages
Elsevier B.V. , 2006. Vol. 366, no 1, 337-349 p.
Keyword [en]
Nitrogen; Carbon; Stable isotopes; Sediment; Garbage dump; Stockholm archipelago
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-24909DOI: 10.1016/j.scitotenv.2005.07.016OAI: oai:DiVA.org:su-24909DiVA: diva2:198511
Note
Part of urn:nbn:se:su:diva-753Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2011-01-13Bibliographically approved
In thesis
1. The influence by point sources on carbon, nitrogen and metals in two sedimentary environments
Open this publication in new window or tab >>The influence by point sources on carbon, nitrogen and metals in two sedimentary environments
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Sediments in two aquatic environments have been investigated. Both are anthropogenically affected and polluted. The focus has been on stable carbon and nitrogen isotopes, C/N ratios, and heavy metals.

The first site is Höggarnsfjärden Bay in the inner parts of the Stockholm Archipelago, Sweden, where a garbage dump releases treated leach water. The effect on carbon and nitrogen in the sediment close to the discharge is large, but 1200 m downstream the effect is diluted by the background discharge of the town of Stockholm and the Lake Mälaren, which drains into the archipelago. The main source of the studied metals is not the garbage dump itself. The sediment close to the discharge shows high enrichment factors due to high sedimentation rate and adsorption, and low decomposition of organic matter. The metal enrichment factors of downstream sites are not higher than the upstream sites.

The second site is Lake Verkasjön close to the north part of Lake Vättern, in the county of Örebro, Sweden. River Salaån flows through Lake Verkasjön on the way through a former mining area to Lake Vättern. Upstream of Lake Verkasjön an ore dressing plant site was used in 1877-1881 for extraction of zinc. During that period the sediment of Lake Verkasjön received high loadings of sulphidic tailings. Normal sedimentation after the event has lead to that the polluted sediment is found as a distinct layer at 18-22 cm. The layer is characterized by elevated metal concentrations, decreased organic matter content and increased stable carbon composition. The sediment that has accumulated above 18 cm works as a physicochemical barrier that seals the waste from the overlying sediment. At the time of the event the signal of aquatic production in the sediment changed; the sediment above the layer has an increased proportion of aquatically produced material, implying changed land use in the catchment area.

Place, publisher, year, edition, pages
Stockholm: Institutionen för geologi och geokemi, 2005. 14 p.
Series
Meddelanden från Stockholms universitets institution för geologi och geokemi, ISSN 1101-1599 ; 325
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:su:diva-753 (URN)91-7155-172-7 (ISBN)
Public defence
2005-12-15, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2005-11-22 Created: 2005-11-22Bibliographically approved

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Mörth, Carl-MagnusHolm, Nils G.
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