Registration Dossier
Registration Dossier
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EC number: 941-627-8 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Using QSAR models (PetroTox and ECOSAR) it was found that the aquatic acute toxicity of the oil is driven by the hydrocarbon fraction of the oil, whereas the chronic toxicity of the substance is driven by the nitriles components of the oil (hexadecanitrile and eicosanitrile). The conservative approach was taken to treat all longer chain nitriles as the most hazardous fatty nitrile, octadecanitrile. The two nitriles are expected to have an additive effect, and are both present in the oil at a maximum concentration of 2 % w/w each, therefore a combined concentration of 4 % w/w nitriles was used to calculate the chronic toxicity of the oil as a whole substance in each aquatic endpoint based on the chronic toxicity of the nitriles.
The estimates generated using PetroTox on the hydrocarbon fraction of the oil demonstrated that fish are the most sensitive species to the oil (96 hour LD50 of 0.44 mg/l and a 14 day NOEL of 0.10 mg/l). The nitrile components of the oil were found to have no effect at saturation using ECOSAR, based on the high predicted Kow of hexadecanitrile (6.73) and octadecanitrile (7.71) which indicates that the substances are unlikely to be soluble enough for aquatic organisms to be exposed.
Again, fish were found to be the most sensitive species to chronic toxicity using the ECOSAR model. The overall Chronic Value for the oil as a whole substance was predicted to be 0.00625 mg/l. The Handbook of Ecotoxicology, Second Edition (edited by D. J. Hoffman, B. A. Rattner, G. A. Burton, Jr., and J. Cairns, Jr., 2002, Lewis Publishing) defines the Chronic Value as 'the concentration (threshold) at which chronic effects are first observed'.
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