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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The estimated algal 48-hr EL50 value for this substance is 9.285 mg/L, for hexane, and the lowest 48-hr NOEL value is 2.077 mg/L, 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 petroleum substance and membrane-water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.

The estimated algal 48-hr EL50 value for this substance is 9.285 mg/L for hexane and the estimated 48 -hr NOEL is 2.077 mg/L, for hexane .

In addition, an experimental study measured an EC50 of 2.66% after a 10 to 14 day exposure for hexane (Stratton, 1998).