Registration Dossier
Registration Dossier
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EC number: 920-750-0 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
A number of studies are available on the ecotoxicity of hydrocarbons, C7-C9, n-alkanes, isoalkanes, cyclics to fish, Daphnia and algae. All studies were conducted using Water Accomodated Fractions (WAFs). Acute toxicity to fish ranged between LL50 values from 3 to 10 mg/L. EL50 values for Daphnia were found to range between 4.6 – 10 mg/L. Toxicity to algae measured as inhibition to growth rate (ELr50) and to biomass (ELb50) ranged from 10 – 30 mg/L each. A study on the chronic toxicity to Daphnia is available. The determination of the long-term toxicity, as measured by survival, sublethal effects, reproduction, and length of first generation adults resulted in a NOELR of 1 mg/L. The chronic aquatic toxicity to fish was estimated as it was done for other organisms 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. The estimated freshwater fish 28-day NOELR value is 0.574 mg/L based on growth. The estimated EL50 value for the protozoan, Tetrahymena pyriformis, as a representative for microorganisms, is 11.14 mg/L based on growth inhibition.
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