Polychlorinated Biphenyl Release from Resuspended Hudson River Sediment

Three shear turbulence resuspension mesocosms (STORM tanks) were used to examine the release of polychlorinated biphenyls (PCBs) from resuspended Hudson River sediment. Twenty-two percent of the resuspended PCBs desorbed after 2 h, and 35% ± 8% of PCBs were in the dissolved phase after apparent stea...

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Bibliographic Details
Published in:Environmental science & technology 2007-02, Vol.41 (4), p.1097-1103
Main Authors: Schneider, Abby R, Porter, Elka T, Baker, Joel E
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Carbon - analysis
Chemical contaminants
Contaminated sediments
Continental surface waters
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental science
Exact sciences and technology
Freshwater
Geologic Sediments - chemistry
Natural water pollution
PCB
Pollution
Pollution, environment geology
Polychlorinated biphenyls
Polychlorinated Biphenyls - analysis
Polychlorinated Biphenyls - chemistry
Rivers
Sediments
Time Factors
Water Movements
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water treatment and pollution
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Summary:Three shear turbulence resuspension mesocosms (STORM tanks) were used to examine the release of polychlorinated biphenyls (PCBs) from resuspended Hudson River sediment. Twenty-two percent of the resuspended PCBs desorbed after 2 h, and 35% ± 8% of PCBs were in the dissolved phase after apparent steady state was reached in 2 days. After the first resuspension event, the solids were allowed to settle and the quiescent time was varied to determine whether the labile pool of PCBs is recharged during sediment consolidation. The steady-state log K oc values for the third subsequent resuspension were higher than for the first event due to lower dissolved PCB concentrations; the particulate PCB concentrations were constant between events. With 1 day of consolidation between resuspension events, the dissolved concentration of all congeners decreased an average of 8% ± 5% between subsequent resuspension events. With 4 days between events, only the dissolved pentachlorinated PCBs decreased significantly (p = 0.002), suggesting that the easily desorbable PCBs recharge when there is sufficient time between resuspension events.
ISSN:0013-936X
1520-5851
DOI:10.1021/es0607584