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Fate of higher brominated diphenyl ethers in lactating cows
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2007 In: Environmental Science & Technology, ISSN 0013-936X, Vol. 41, no 2, 417-423 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2007. Vol. 41, no 2, 417-423 p.
Identifiers
URN: urn:nbn:se:su:diva-24211ISI: 000243388200018OAI: oai:DiVA.org:su-24211DiVA: diva2:197026
Note
Part of urn:nbn:se:su:diva-6779Available from: 2007-04-19 Created: 2007-04-19Bibliographically approved
In thesis
1. PBDEs in the Environment: Time trends, bioaccumulation and the identification of their successor, decabromodiphenyl ethane
Open this publication in new window or tab >>PBDEs in the Environment: Time trends, bioaccumulation and the identification of their successor, decabromodiphenyl ethane
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Polybrominated diphenyl ethers (PBDEs) are important chemical flame retardants, but also environmental pollutants. Their bromine substitution lends them a different bioaccumulation behaviour than the better studied organochlorines.

The contamination of a Swedish lake with lower brominated BDEs was assessed by a retrospective study of pike. The concentrations of tetra- to hexaBDEs increased exponentially up to the mid-1980s and then decreased slowly, possibly reflecting the voluntary reduction in production/usage of the chemicals. Methoxylated PBDEs were found to be present in similar concentrations to the PBDEs, but originated from different sources. The large size of the bromine atom was believed to result in negligible absorption of higher brominated BDEs in wildlife, thus explaining the low levels observed in fish despite high levels in e.g. sediment. However, it was shown that the fully brominated BDE, BDE209, was absorbed to a small extent via the diet. Once absorbed, it was reductively debrominated to lower brominated BDE congeners. Debromination was also observed in dairy cows exposed to higher brominated BDEs in their natural diet. Moreover, the molecular size restricted the transfer of higher brominated BDEs to milk. In contrast to PCBs and lower brominated BDEs, there was no equilibrium between adipose tissues and milk fat, and with increasing bromine substitution a progressively smaller fraction of the ingested PBDEs was transferred to the milk.

This thesis highlights differences in uptake, metabolism and excretion for PBDEs compared to the well characterized organochlorines. A knowledge that is useful for risk assessments given the ongoing use of these compounds. Furthermore, a representative of the next generation brominated flame retardants, decabromodiphenyl ethane, a replacement for the BDE209 technical product, was identified for the first time in the environment.

Place, publisher, year, edition, pages
Stockholm: Institutionen för tillämpad miljövetenskap (ITM), 2007. 77 p.
Keyword
PBDE, BDE209, dietary absorption, metabolism, debromination, bioaccumulation, decabromodiphenyl ethane, decabromodiphenyl ether
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-6779 (URN)91-7155-410-6 (ISBN)
Public defence
2007-05-11, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
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Available from: 2007-04-19 Created: 2007-04-19Bibliographically approved

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