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Selected organochlorine pesticides, PCBs and their methyl sulfonyl metabolites in Greenland shark (Somniosus microcephalus)
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Institute of Biology, University of Iceland.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
(English)Manuscript (preprint) (Other academic)
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-45827OAI: oai:DiVA.org:su-45827DiVA: diva2:369858
Available from: 2010-11-12 Created: 2010-11-12 Last updated: 2010-12-06Bibliographically approved
In thesis
1. Organohalogen contaminants in Greenland shark (Somniosus microcephalus)
Open this publication in new window or tab >>Organohalogen contaminants in Greenland shark (Somniosus microcephalus)
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The remote sub-Arctic/Arctic environment has due to human activities become a sink for organohalogen contaminants (OHCs). These OHC include traditional contaminants such as polychlorinated biphenyls (PCBs), DDTs and technical mixtures of polybrominated diphenyl ethers (PBDEs), all included in the Stockholm Convention list of persistent organic pollutants (POPs). Other OHCs, currently under evaluation to be included among the POPs i.e. short chain chlorinated paraffins (SCCPs) and hexabromocyclododecane (HBCDD) are also found in these environments as well as a whole range of other OHCs.

The main objective of this thesis is to increase the knowledge about the presence of OHCs in a high trophic Arctic shark species, the Greenland shark (Somniosus microcephalus). The Greenland shark is an opportunistic feeder, occasionally feeding at the top of the Arctic marine food chain. Furthermore may this species have a life span in excess of 100 years and is probably among the oldest of any fish species. These traits make the shark prone to accumulate elevated concentrations of OHCs.

This has shown to be true for the Greenland sharks studied and most of the targeted OHCs were determined in the species. The highest concentrations were observed for the DDTs, ranging up to 26 μg/g fat. Other OHCs reported that are of special interest are SCCPs and brominated flame retardants used as replacement products to PBDEs; pentabromoethylbenzene (PBEB) and 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE). Also a range of OHCs whose origin is assumed to be natural, were shown to be present in Greenland sharks.

This thesis is stressing the fact that even though the use of certain OHCs has been banned for decades they are still present at high concentrations in the deep waters of the Arctic. Therefore it is of major importance to continue to monitor the fate of traditional and emerging OHCs in the environment, and for this purpose the Greenland shark is an excellent species.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry, Stokcholm University, 2010. 69 p.
Keyword
persistent organic pollutants, sub-Arctic, Iceland, shark
National Category
Environmental Sciences
Research subject
Environmental Chemistry
Identifiers
urn:nbn:se:su:diva-45828 (URN)978-91-7447-139-7 (ISBN)
Public defence
2010-12-17, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Formas, Dnr 2004-347
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.Available from: 2010-11-25 Created: 2010-11-12 Last updated: 2010-12-06Bibliographically approved

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