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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

The hydrocarbons, C9, aromatics, estimated freshwater fish 28-day NOELR (No Observed Effect Loading Rate) value is 1.23 mg/l based on growth.

Key value for chemical safety assessment

Additional information

Substance is a hydrocarbon UVCB that poses a chronic aquatic hazard. The hydrocarbon block method is used for environmental risk assessment (see REACH guidance, R7, app.13-1). Aquatic PNECs for hydrocarbon blocks have been derived using the HC5 statistical extrapolation method and the target lipid model using representative structures. See Product Library tab in PETRORISK spreadsheet attached to Section 13. Given the large database of freshwater organisms included in the target lipid model, an assessment factor of one has been applied to the HC5.

The estimated freshwater fish 28-day NOELR (Lowest Observed Effect Loading Rate) value is 1.228 mg/l based on growth. In this methodology, different loadings of the substance are added to the test medium and equilibrium between the water and the hydrocarbons is achieved according to their specific water solubility. The hydrocarbon concentrations at equilibrium will be characteristic of the loading of the substance, and therefore toxicity values from WAF studies are expressed as effect loadings or lethal loadings (EL or LL), not as concentrations. These effect loadings are used to determine environmental classifications. The WAF methodology is widely accepted for the testing of complex hydrocarbon substances and other UVCBs, and it has been incorporated in different guidance documents, including the REACH guidance (see document in Section 13)