Modeling PAH Toxicity in Sediments Sample Clauses

Modeling PAH Toxicity in Sediments. The concentrations of selected PAHs in the sediments of Port Xxxxxx have been identified in samples collected during several monitoring and research studies. Sampling sites included the Small Boat Harbor (U.S. ACE, 1995), offshore of the Valdez Marine Terminal and Gold Creek (Xxxxx and Shaw, 1993, 1994b, 1995, and 1996; Kinnetics Laboratories Inc., 1995), near Solomon Gulch Hatchery (unpublished data., Xxxxx Xxxx, University of Alaska Fairbanks, 1996), and other deep water areas of the Port (Xxxxx and Shaw, 1993, 1994b, 1995, and 1996). These measured concentrations provided input for the ∑PAH model developed by Xxxxxx et al. (1995). The steps of the model are shown in Figure 2-4. This model combines five well-known models to assess the risk due to hydrocarbons in the sediments. 1. Equilibrium Partitioning model: describes the partitioning of PAH in the sediment interstitial water based on the total organic carbon content of the sediments 2. QSAR model: determines the acute toxicity of individual PAHs to amphipods in a 10-day test 3. Toxic Unit model: describes the toxicity of the PAHs in the interstitial water 4. Additivity model: determines the total toxicity from 13 selected PAHs 5. Concentration-response model: describes the mortality response of amphipods to spiked field sediments The model predicts the probability of no toxicity (defined as <13% mortality), uncertain toxicity (defined as 13-24% mortality), and toxicity (defined as >24% toxicity). The model input, output and calculations can be found in Appendix E. The results are described in Section 7.2.
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Related to Modeling PAH Toxicity in Sediments

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