Title
Factors influencing the rate of polychlorinated biphenyl dechlorination in hudson river sediments Factors influencing the rate of polychlorinated biphenyl dechlorination in hudson river sediments
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Easton, Pa ,
Subject
Chemistry
Biology
Source (journal)
Environmental science and technology / American Chemical Society. - Easton, Pa
Volume/pages
27(1993) :6 , p. 1125-1131
ISSN
0013-936X
ISI
A1993LE44200028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
The altered distribution of polychlorinated biphenyls (PCBs) observed in aquatic sediments due to anaerobic microbial activity displays a depletion of highly chlorinated PCB congeners with corresponding increases in the lower chlorinated PCBs. Laboratory experiments demonstrated PCB dechlorination over a broad range of PCB concentrations (20-1500 ppm) and conditions. The observed rate of anaerobic PCB dechlorination in Hudson River, NY, sediments was most significantly affected by PCB sediment concentrations in both laboratory experiments and in the environment. Therefore, these laboratory observations are consistent with the extent of PCB dechlorination occurring naturally in Hudson River sediments and other aquatic sediments. Additions of various nutrients and surfactants resulted in inhibition or only minor (2-fold) rate accelerations compared to unamended sediments. The addition of vitamin B-12 inhibited PCB dechlorination rates 3-fold with an apparent K(i) of 100 mug/L. Dechlorination of aged PCBs occurred at rates comparable (80%) to that of freshly spiked material.
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