Polychlorinated Biphenyl Release from Resuspended Hudson River Sediment
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Date
2007
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Citation of Original Publication
Schneider AR, Porter ET, Baker JE (2007) PCB release from resuspended Hudson River sediment. Environmental Science and Technology 41(4): 1097-1103.
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Abstract
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 Koc 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.