Toxicity and bioaccumulation of DDT in freshwater amphipods in exposures to spiked sediments

Environmental Toxicology and Chemistry
Guilherme R LotufoMichelle L Gedeon

Abstract

The amphipods Hyalella azteca and Diporeia spp. were exposed to sediments dosed with dichlorodiphenyltrichloroethane (DDT), and the toxicity and toxicokinetics were determined. The toxicity was evaluated with the equilibrium partitioning (EqP) and critical body residue approaches. The DDT in the sediments degraded during the equilibration period prior to organism exposure. Thus, the toxicity using EqP pore-water toxic units (TUs) was evaluated for DDT and its degradation product, dichlorodiphenyldichloroethane (DDD), as the ratio of the predicted interstitial water concentration divided by the water-only LC50 values. The sum of TUs (sum(TU)) was assumed to best represent the toxicity of the mixture. For H. azteca, the 10-d LC50 was 0.98 and 0.33 sum(TU) for two experiments. For Diporeia spp., no toxicity was found in the first experiment with up to 3 sum(TU) predicted in the interstitial water. However, in the second experiment, the 28-d LC50 was 0.67 sum(TU). These data suggest that the EqP approach approximately predicts the toxicity for the combination of DDT and DDD in sediment, provided a toxic unit approach is employed. The critical body residue approach also used TUs because DDT is biotransformed by H. azteca and because...Continue Reading

References

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Citations

Mar 21, 2007·Bulletin of Environmental Contamination and Toxicology·S SmithS S Knight
Jul 28, 2011·Environmental Science and Pollution Research International·Bernhard WetterauerHenner Hollert
Aug 1, 2014·Journal of Environmental Sciences (China)·Cai LiuQingzhu Zhang
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Apr 29, 2009·Archives of Environmental Contamination and Toxicology·Richard E LizotteSammie Smith

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