Oil Toxicity Modeling

Exponent has extensive experience evaluating the toxicity and associated hazards of petroleum releases in regions around the globe. Our team of environmental scientists and chemical engineers understands the key factors that control the bioavailability and toxicity of oil’s complex mixture of hydrocarbons in the aquatic and terrestrial environments, an understanding that is critical for interpreting the results of laboratory toxicity tests and extrapolating this information to field conditions.

Exponent staff are experienced in application of the Target Lipid Model (TLM) to predict the toxicity of individual petroleum hydrocarbons and its use by regulatory authorities to derive threshold values for oil. The TLM is the toxicity model incorporated in Petrotox, an industry-supported model for petroleum substances. Exponent has effectively used these models to demonstrate the effect of weathering, the impact of oil droplets, and the effect of dispersants on the toxicity of oil in the environment. Exponent’s depth of experience with application of these models makes us uniquely able to help clients address current issues on the environmental effects of petroleum releases.

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