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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The estimated freshwater algae 72-h EL50 (Effective Loading Rate) value is 8.204 mg/L based on biomass.
The estimated freshwater algae 72-h NOELR (No Observed Effective Loading Rate) value is 1.835 mg/L based on biomass.

Key value for chemical safety assessment

Additional information

There are no measured toxicity data available for isoheptane. Thus, an EL50 (72 h) and a NOELR (72 h) were calculated.

The aquatic toxicity 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 are 8.204 and 1.835 mg/L, respectively, based on biomass.