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Short-term toxicity to aquatic invertebrates

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Description of key information

The estimated 48 hour EL50 for freshwater invertebrates is 21.85 mg/l based on mobility, for hexane.

Key value for chemical safety assessment

Additional 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 hydrocarbon substance and membrane-water partitioning coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism. The estimated freshwater invertebrate EL50 value is 21.85 mg/l based on mobility, for hexane.

In addition, an experimental LC50 of 45 mmol/m3 for Daphnia magna was measured as a water accommmodated fraction (Bobra et al, 1983).