Document Detail

Facilitated transport of polychlorinated biphenyls and polybrominated diphenyl ethers by dissolved organic matter.
MedLine Citation:
PMID:  19350907     Owner:  NLM     Status:  MEDLINE    
The exchange rate of hydrophobic organic chemicals between the aqueous phase and a sorbent (e.g., soil, organism, passive sampler) is relevant for distribution processes between environmental compartments, including organisms. Dissolved phases such as humic acids, proteins, and surfactants can affect the transfer of such chemicals between the aqueous and sorbent phases by sorption and desorption processes. In this study, the desorption of polychlorinated biphenyls and polybrominated diphenyl ethers from a polymer phase to an aqueous medium was monitored at different humic acid concentrations. The rate of release of the chemical by the polymer phase demonstrates thatthe chemical sorbed to dissolved humic acid contributed significantly to the total mass transfer when the affinity for the humic acid was sufficiently high. This illustrates that environmentally relevant humic acid concentrations can facilitate transport of hydrophobic organic chemicals. The consequences of these facilitated transport mechanisms for uptake into passive samplers are discussed, in particular in situations where equilibration is very slow or when exposure varies in time or space.
Thomas L ter Laak; Jan C H Van Eijkeren; Frans J M Busser; Herman P Van Leeuwen; Joop L M Hermens
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  43     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-04-08     Completed Date:  2009-04-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1379-85     Citation Subset:  IM    
Institute for Risk Assessment Sciences, Utrecht University, Yalelaan 2, 3584 CM Utrecht, The Netherlands.
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MeSH Terms
Computer Simulation
Halogenated Diphenyl Ethers / chemistry*
Humic Substances
Organic Chemicals / chemistry*
Polychlorinated Biphenyls / chemistry*
Time Factors
Water / chemistry
Reg. No./Substance:
0/Halogenated Diphenyl Ethers; 0/Humic Substances; 0/Organic Chemicals; 0/Polychlorinated Biphenyls; 7732-18-5/Water

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