| Anaerobic microbial and photochemical degradation of 4,4'-dibromodiphenyl ether. | |
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MedLine Citation:
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PMID: 12688689 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The anaerobic microbial and photochemical degradation pathways of 4,4'-dibromodiphenyl ether (BDE15) were examined. BDE15 was reductively debrominated within a fixed-film plug-flow biological reactor at hydraulic retention times of 3.4 and 6.8 h, leading to exclusive production of 4-bromodiphenyl ether (BDE3) and diphenyl ether (DE). A suite of potential BDE15 metabolites arising from reductive debromination, hydroxylation, and methoxylation of the aromatic C-Br and C-H bonds were not observed. Following initial debromination of BDE15, degradation of BDE3 to DE readily occurs, suggesting the rate-limiting step for anaerobic BDE15 degradation is conversion of BDE15 to BDE3. The photochemical degradation of BDE15 was also examined in organic (CH3CN and CH3OH) and aqueous (H2O:CH3CN; 1:1 v/v) solvent systems at 300 nm. Only photochemically induced reductive debromination was found to occur via homolytic C-Br bond cleavage, with no evidence of C-O bond cleavage or products arising from heterolytic bond cleavage. |
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Authors:
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Sierra Rayne; Michael G Ikonomou; MacMurray D Whale |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Water research Volume: 37 ISSN: 0043-1354 ISO Abbreviation: Water Res. Publication Date: 2003 Feb |
Date Detail:
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Created Date: 2003-04-11 Completed Date: 2003-04-25 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0105072 Medline TA: Water Res Country: England |
Other Details:
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Languages: eng Pagination: 551-60 Citation Subset: IM |
Affiliation:
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Department of Chemistry, P.O. Box 3065, University of Victoria, Victoria, BC, Canada V8W 3V6. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria, Anaerobic
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physiology* Biodegradation, Environmental Biphenyl Compounds / metabolism* Ethers Photochemistry Water Pollutants, Chemical / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Biphenyl Compounds; 0/Ethers; 0/Water Pollutants, Chemical; 92-86-4/4,4'-dibromobiphenyl |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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