| Tenax extraction as a tool to evaluate the availability of polybrominated diphenyl ethers, DTT, and DTT metabolites in sediments. | |
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MedLine Citation:
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PMID: 18220446 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Solid-phase extraction with Tenax is one of the most used methods for determining the fraction of a pollutant that desorbs rapidly from sediment and thus is available for living beings. In the present study, this technique has been applied to sediment contaminated in the laboratory with polybrominated diphenyl ethers (PBDEs) and dichlorodiphenyltrichloroethane, dichlorodifenyldichloroethylene, and dichlorodifenyldichloroethane (generically, DDXs). The amount of chemical retained in sediment during the time of the experiment fit well with a three-phase exponential desorption model. The ratios between the rapidly desorbing fraction and the fraction desorbed during a fixed time (6 or 24 h) were calculated. The fraction desorbed in 6 h was lower than the rapidly desorbing fraction for most of PBDEs, whereas the fraction desorbed in 24 h exceeded the rapidly desorbing fraction for both groups of compounds. However, variability of these data suggests, when possible, a long time measure of desorption in order to achieve a more accurate estimation. Both the extent and the velocity of desorption were inversely related with the bromination degree and, consistently, with hydrophobicity and molecular size. In this way, low brominated PBDEs and DDXs showed a high availability relative to high brominated PBDEs. |
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Authors:
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Agustina de la Cal; Ethel Eljarrat; Tim Grotenhuis; Damià Barceló |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-01-25 |
Journal Detail:
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Title: Environmental toxicology and chemistry / SETAC Volume: 27 ISSN: 0730-7268 ISO Abbreviation: Environ. Toxicol. Chem. Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-09 Completed Date: 2008-07-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8308958 Medline TA: Environ Toxicol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 1250-6 Citation Subset: IM |
Affiliation:
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Department of Environmental Chemistry, Chemical and Environmental Research Institute of Barcelona, Spanish National Research Council, Barcelona, Spain. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Dithiothreitol / chemistry*, metabolism* Ethers / chemistry* Geologic Sediments / chemistry* Kinetics Polybrominated Biphenyls / chemistry* Polymers / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Ethers; 0/Polybrominated Biphenyls; 0/Polymers; 24938-68-9/tenax; 3483-12-3/Dithiothreitol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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