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- W2036952202 abstract "Laboratory studies were conducted to evaluate the bioaccumulation of aged polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in soil near the base of the terrestrial food chain using earthworms (E. fetida) as a model organism. This research also assessed the effect of activated carbon (AC) addition to soil on PCDD/F bioaccumulation in earthworms and passive uptake in polyoxymethylene (POM) samplers. Two soils taken from a wetland and a levee along the Tittabawassee River floodplain downstream of Midland, MI were used in this study. In the untreated soils, biota sediment accumulation factors (BSAFs) ranged from 0.17 for 2,3,7,8-TCDD to 0.02 for some of the higher chlorinated congeners, which were substantially lower than would be predicted using a conventional equilibrium partitioning model. The addition of AC to the floodplain soils generally reduced the BSAF values to lower than 0.02. Amendment of the wetland soil (having a high organic content) with 2% and 5% AC resulted in a 78 and 91% reduction of toxicity equivalent (TEQ) in earthworms, respectively. More strikingly, amendment of the natural levee soil (having a low organic content) with 2% and 5% AC showed >99% reduction of TEQ in earthworms. Also, freely dissolved aqueous concentrations of PCDD/Fs in soil slurries, as measured by equilibrium passive samplers, decreased up to 99% with AC treatment. Results of this study indicate that bioaccumulation of PCDD/Fs in earthworms from historically impacted floodplain soils is low and can be further reduced by amending with a strong sorbent." @default.
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- W2036952202 date "2010-06-18" @default.
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- W2036952202 title "Bioaccumulation of Polychlorinated Dibenzo-<i>p</i>-Dioxins/Dibenzofurans in <i>E. fetida</i> from Floodplain Soils and the Effect of Activated Carbon Amendment" @default.
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- W2036952202 doi "https://doi.org/10.1021/es9027138" @default.
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