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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

No data is available for 2,2,3-trimethylbutane. However, data is available for Isoheptane and is being read across to using the category approach explained in the category justification document attached to Section 13 of the dossier.

The estimated freshwater algae 72-h EL50 (Effective Loading Rate) value for Isoheptane is 8.204 mg/L, based on biomass.

The estimated freshwater algae 72-h NOELR (No Observed Effective Loading Rate) value for Isoheptane is 1.835 mg/L, based on biomass.

Key value for chemical safety assessment

Additional information

The aquatic toxicity of Isoheptane was estimated using the Petrotox computer model (v. 3.04), 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 algae 72-h EL50 (Effect Loading Rate) and NOELR (No Observed Effect Loading Rate) values for Isoheptane are 8.204 and 1.835 mg/L, respectively, based on biomass.