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Photochemistry of Chlorinated and Brominated Diaryl Ether Environmental Contaminants by Sierra Rayne B.Sc., Okanagan University College, 2000 A Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY in the Department of Chemistry We accept this thesis as conforming to the required standard Dr.
After a short irradiation period in acetonitrile at 302nm, the major photoproducts of BDE153 included 2,2′,4,4′,5-(BDE99), 2,2′,4,5,5′-(BDE101), and 2,4,4′,5,5′-(BDE118) substituted pentaBDEs as primary photohydrodebromination products, 2,2′,4,4′-(BDE47), 3,3′,4,4′-(BDE77), 2,3′,4,4′-(BDE66), and 2,2′,4,5′-(BDE49) substituted tetra-BDEs as secondary photohydrodebromination products, a suite of non-2,3,7,8-substituted mono- through penta-brominated dibenzofurans, and three tetrabrominated 2-hydroxybiphenyl congeners.
Here we report a GC-RRT model for all the 209 PBDE congeners from mono- to deca-brominated using a “practical” multi-linear temperature program currently used to identify known PBDE congeners in environmental samples within our high-throughput research laboratory.
Brominated flame retardants - an overview, Proceedings of The Second International Workshop on Brominated Flame Retardants, Stockholm, Sweden, May 14-16, 2001;
PDBEs appear to be traveling more quickly to the Arctic than PCBs or dioxins, according to the first This is the first peer-reviewed temporal analysis of brominated flame retardant research showing PBDE levels in Arctic animals.
functioning, because the stuff The chemicals are suspected to is so hydrophobic that I would Mountain whitefish appear to be taking up polyimpact thyroid and endocrine think that it would get taken brominated diphenyl ethers (PBDEs) more rapidly system functioning, and rodent out pretty readily before it than any other studied organism, including humans studies show that they may im- and ringed seals from the Canadian Arctic.
Another notable aspect of Ikonomou’s latest findings is that the whitefishes’ levels of the various brominated flame retardant compounds, or congeners, closely mirrors the patterns in the mixtures sold commercially.
PentaBDE contains mainly penta- and hexa-brominated congeners, octa-BDE is composed of mostly hepta- and octa-brominated congeners, and deca-BDE is primarily the fully brominated BDE209 (.90%) with traces of nona-brominated impurities.