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Short-term toxicity to aquatic invertebrates

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Description of key information

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 48-hr LL50 value for Daphnia Magna is 1.99 mg/L.

Supporting data on Toluene, DCPD and Ethylbenzene, three constituents in Category J, were used to support the QSAR prediction. Experiemental 48-hour LC/IC50s of 3.78, 2.2 and 0.823 mg/L (for toluene, ethylbenzene and DCPD, respectively) have been reported.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
1.99 mg/L

Additional information