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Ecotoxicological information

Toxicity to microorganisms

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Key value for chemical safety assessment

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The aquatic toxicity was estimated using the PETROTOX computer model, which combines a partitioning model (used to calculate the aqueous concentration of hydrocarbon components as a function of substance loading) with the Target Lipid Model (used to calculate acute and chronic toxicity of non-polar narcotic chemicals). PETROTOX computes toxicity based on the summation of the aqueous-phase concentrations of hydrocarbon block(s) that represent a petroleum substance and membrane-water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism. The estimated 40-hr EL50 value forTetrahymena pyriformis, one of the most sensitive microorganism species, is 15.41 mg/L.