Registration Dossier
Registration Dossier
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EC number: 932-020-9 | CAS number: 246538-71-6
Endpoint summary
Administrative data
Description of key information
Additional information
A study is available on the acute ecotoxicity of hydrocarbons, C7-C9, isoalkanes to fish. Data on the acute toxicity to other organisms as well as data on chronic toxicity are read across to both, hydrocarbons, C7-C9, n-alkanes, isoalkanes, cyclics and 2,3,4-trimethylpentane, or 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. All studies were conducted using Water Accomodated Fractions (WAFs). For acute toxicity to fish a LL50 of 18.4 mg/L was determined. The EL50 value for Daphnia is 2.4 mg/L. Toxicity to algae measured as growth inhibition and biomass ranged from 10-30 mg/L. 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 and toxicity to microorganisms were estimated for C8 -C9 isoalkanes using the Petrotox computer model. The estimated freshwater fish 28-day NOELR value is 0.46 mg/L based on growth. The estimated EL50 value for the protozoan, Tetrahymena pyriformis, as a representative for microorganisms, is higher than 1000 mg/L based on growth inhibition.
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