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Enantioselective analysis of organochlorine pesticides in herring and seal from the Swedish marine environment
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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1998 (English)In: Marine Pollution Bulletin, ISSN 0025-326X, E-ISSN 1879-3363, Vol. 36, no 5, 345-353 p.Article in journal (Refereed) Published
Abstract [en]

Factors influencing the changes of enantiomeric ratios (ERs) in herring (Clupea harengus), grey seal (Halichoerus grypus), harbour seal (Phoca vitulina) and ringed seal (Phoca hispida) collected along the Swedish coastline were studied by enantioselective high-resolution gas chromatography (HRGC). Three-year-old male and female herring individuals from different sampling sites were selected, whereas seal blubber and liver samples represented different species, sexes and geographical locations. Enantioselective analysis of α-hexachlorocyclohexane (α-HCH), chlordanes and chlordane metabolites were performed. In general, herring showed similar ERs within the Baltic Sea. Results indicate that species specific differences are important factors controlling the ERs of Baltic seals. Inverse ERs in seal blubber and liver, and a low deviation from the racemic ratio of some components in the liver, indicate that not only enantioselective degradation but also stereoselectivity of other processes are responsible for the changes of ERs in biota.

Place, publisher, year, edition, pages
Oxford: Pergamon Press, 1998. Vol. 36, no 5, 345-353 p.
Keyword [en]
pesticides, bioaccumulation, degradation, enantiomers, Baltic seals, herring
National Category
Environmental Sciences Ecology
URN: urn:nbn:se:umu:diva-5447DOI: 10.1016/S0025-326X(97)00187-2ISI: 000074689400012OAI: diva2:144962
Available from: 2002-01-25 Created: 2002-01-25 Last updated: 2016-08-26Bibliographically approved
In thesis
1. Enantiospecific Analysis and Environmental Behavior of Chiral Persistent Organic Pollutants (POPs)
Open this publication in new window or tab >>Enantiospecific Analysis and Environmental Behavior of Chiral Persistent Organic Pollutants (POPs)
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Many persistent organic pollutants (POPs) are chiral. These pollutants are generally released into the environment as racemates, but frequently undergo alterations in enantiomeric composition as soon as they are subjected to life chemistry processes. Enantiospecific analysis of chiral POPs is important since enantiomers of chiral compounds often exhibit differences in biological activity, and most biochemical processes in nature are stereospecific. For abiotic processes, such as air-water gas exchange, deposition and long-range air transport, enantiomeric patterns of POPs may be used as chemical markers.

The aim of the work described in this thesis was to improve our knowledge about the presence and fate of enantiomers of chiral POPs inthe environment to provide a sound basis for accurate risk assessment. The compounds included were organochlorine (OC) pesticides (α-HCH, chlordanes and o,p’-DDT), atropisomeric PCBs and some of their respective metabolites (heptachlor-exo-epoxide, oxychlordane and MeSO2-PCBs).

Analytical methods for chiral PCBs were developed, and the elution sequences of (+) and (−)-enantiomers were determined. Enantiomeric fraction (EF) was proposed as a better reflector of chiral composition than the conventional enantiomeric ratio (ER).

Enantioselective bioprocessing in various compartments was studied, with the main emphasis on factors controlling chiral composition in biota Correlations were detected between changes in EFs and differences in trophic levels. The changes were, however, not consistent for all compounds. Instead, the enantiomeric composition was found to be species-specific in the polar bear food chain and in aquatic species from the Baltic Sea. The EFs of some POPs in Baltic seals were related tonutritional status and biotransformation capacity.

Enantiomeric and isomeric patterns were used to investigate abiotic processes in the southern Baltic Sea environment and EFs were used tostudy soil as a source of atmospheric heptachlor-exo-epoxide.

90 p.
urn:nbn:se:umu:diva-9 (URN)91-7305-162-4 (ISBN)
Public defence
Available from: 2002-01-25 Created: 2002-01-25 Last updated: 2012-06-28Bibliographically approved

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Wiberg, KarinHaglund, PeterRappe, Christoffer
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