Registration Dossier
Registration Dossier
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EC number: 300-227-8 | CAS number: 93924-33-5 A distillate obtained from the redistillation of a complex combination of hydrocarbons obtained by the distillation of the effluents from a severe catalytic hydrotreatment of paraffins. It boils in the range of approximately 190°C to 330°C (374°F to 594°F).
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The estimated 40-hr EL50 value for Tetrahymena pyriformis, one of the most sensitive aquatic microorganism species, is >1000 mg/L and the estimated NOEL is 2.492 mg/L.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 1 000 mg/L
- EC10 or NOEC for microorganisms:
- 2.492 mg/L
Additional information
The aquatic toxicity was estimated using the PETROTOX computer model, 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 petroleum substance and membrane-water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism. The estimated 40-hr EL50 value forTetrahymena pyriformis, one of the most sensitive microorganism species, is >1000 mg/L and the estimated NOEL is 2.492 mg/L.
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