Document Detail

Influence of long contact times on sediment sorption kinetics of spiked chlorinated compounds.
MedLine Citation:
PMID:  16193741     Owner:  NLM     Status:  MEDLINE    
The desorption kinetics of hexachlorobenzene (HCB) and 2,4,4'-trichlororbiphenyl (PCB 28) spiked to a field sediment were studied using a gas-purge technique. A contact time of up to 1,461 d was used to assess long-term changes in desorption kinetics. Purge-induced desorption experiments lasted from 300 to more than 4,000 h. Fast-, slow-, and very-slow-desorbing fractions could be distinguished. The desorption patterns changed with contact time from mainly fast- and slow-desorbing fractions toward the domination of slow- and very-slow-desorbing fractions. The desorption pattern for HCB after a contact time of 1,461 d became comparable to previously reported desorption patterns observed for in situ contaminants. An additional spike of HCB, PCB 28, 2,4,6-trichlorobiphenyl, and 2,2',4,5'-tetrachlorobiphenyl applied to the sediment purged for more than 4,000 h showed that very slow sites were accessible for these compounds within a few hours. Only very small fast-desorbing fractions could be detected after a contact time of just 48 h. These results indicate that domination of very slow desorption is caused not only by long contact times but, perhaps, also by the accessibility of specific sites within the sediment matrix.
Theodora E M ten Hulscher; Bea A Vrind; Henny Van Den Heuvel; Paul C M Van Noort; Harrie A J Govers
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  24     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-30     Completed Date:  2006-01-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2154-9     Citation Subset:  IM    
Institute for Inland Water Management and Waste Water Treatment (RIZA), P.O. Box 17, 8200 AA Lelystad, The Netherlands.
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MeSH Terms
Carbon / chemistry
Chlorine / chemistry*
Environmental Monitoring
Environmental Pollutants
Hexachlorobenzene / chemistry*
Models, Statistical
Polychlorinated Biphenyls / chemistry*
Polycyclic Hydrocarbons, Aromatic / chemistry
Soil Pollutants
Time Factors
Water Pollutants, Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Polychlorinated Biphenyls; 0/Polycyclic Hydrocarbons, Aromatic; 0/Soil Pollutants; 0/Water Pollutants, Chemical; 118-74-1/Hexachlorobenzene; 35693-92-6/2,4,6-trichlorobiphenyl; 41464-40-8/2,2',4,5'-tetrachlorobiphenyl; 7012-37-5/2,4,4'-trichlorobiphenyl; 7440-44-0/Carbon; 7782-50-5/Chlorine

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