Registration Dossier
Registration Dossier
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EC number: 293-263-8 | CAS number: 91053-01-9 A complex combination of hydrocarbons obtained from distillation of the butadiene-free C4 fraction of a naphtha steam-cracking process. It consists predominantly of olefinic hydrocarbons having carbon numbers of C8, C12, C16 and C20 and boiling in the range of approximately 170°C to 185°C (338°F to 365°F).
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Experimental data are available for the toxicity of some Category B constituents towards active sludge. The 28 day NOEC for Hydrocarbons, C4, 1,3-butadiene-free, polymd., dibutylene fraction was 100 mg/L based on nominal concentrations. The 56 day NOEC for Hydrocarbons, C4, 1,3-butadiene-free, polymd., tetraisobutylene fraction, hydrogenated was 23.5 mg/L based on nominal concentrations.
Key value for chemical safety assessment
Additional information
The PETROTOX v4.0 model combines a partitioning model used to calculate the aqueous concentration of hydrocarbon constituents 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 hydrocarbon substance and membrane-water partition coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.
The predicted values were:
| Species | Carbon No. | LL50 / EL50 (mg/L) | EL10 (mg/L) |
| Activated Sludge | C8 | >1000 | 6.23 |
| Activated Sludge | C12 | >1000 | >1000 |
| Activated Sludge | C16 | >1000 | >1000 |
| Activated Sludge | C20 | >1000 | >1000 |
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