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Assessing the Application of an Additive Model to Estimate Toxicity of a Complex Effluent

^a Wildlife and Fisheries Sciences, Texas A&M University, 210 Nagle Hall, 2258 TAMU, College Station, TX 77843-2258
^b Department of Zoology, Oklahoma State University, Stillwater, OK 74078

View larger version (14K): [in a new window]   Fig. 1. Empirical and model Galeolaria caespitosa larval development EC50 values (concentration of test material that affects 50% of the test organisms) for 26 effluent samples from a lead smelter (95% confidence intervals are shown for the empirical EC50 values).

View larger version (18K): [in a new window]   Fig. 2. Empirical EC50 values (concentration of test material that affects 50% of the test organisms) plotted against model EC50 values for 26 effluent samples from a lead smelter. The fine lines indicate the two trend lines (with associated formulas).

View larger version (12K): [in a new window]   Fig. 3. Empirical and model EC50 values (concentration of test material that affects 50% of the test organisms) for eight artificial "effluent" metal mixtures (metal concentrations listed in Table 1) (95% confidence intervals are shown for the empirical EC50 values). Note: asterisk points indicate that the mixture was not toxic enough to generate an EC50 value.

View larger version (18K): [in a new window]   Fig. 4. Modeled historical toxicity associated with the smelter effluent over the past 20 years.