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Registration Dossier
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EC number: 265-062-5 | CAS number: 64741-60-2 A complex combination of hydrocarbons produced by the distillation of products from a catalytic cracking process. It consists of hydrocarbons having carbon numbers predominantly in the range of C11 through C30 and boiling in the range of approximately 205°C to 450°C (401°F to 842°F). It contains a relatively large proportion of tricyclic aromatic hydrocarbons.
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
In a key, static 72 hour Pseudokirchneriella subcapitata growth inhibition test (OECD 201, KS=1), 10000 cells/mL were exposed to the Water Accommodated Fraction (WAF) of light cracked gas oils (MRD-10-595) at nominal concentrations of 0.05, 0.23, 1.01, 4.56 and 20.5 mg/L. The 72 hour EL50 was 0.51 mg/L and NOELR was 0.05 mg/L based on growth rate (ExxonMobil 2012e).
In a supporting, static 72 hour Pseudokirchneriella subcapitata growth inhibition test (OECD 201, KS=1), 10000 cells/mL were exposed to the Water Accommodated Fraction (WAF) of light cracked gas oils (MRD-10-578) at nominal concentrations of 0.05, 0.23, 1.01, 4.56 and 20.5 mg/L. The 72 hour EL50 was 0.93 mg/L and NOELR was 0.05 mg/L based on growth rate (ExxonMobil 2011d).
In a supporting, static 72 hour Pseudokirchneriella subcapitata growth inhibition test (OECD 201, KS=1), 10000 cells/mL were exposed to the Water Accommodated Fraction (WAF) of light catalytic cracked gas oils (MRD-10-576) at nominal concentrations of 0.10, 0.32, 1.02, 3.28 and 10.5 mg/L. The 72 hour EL50 was 0.53 mg/L based on growth rate. The 72 hour NOELR was 0.1 mg/L (ExxonMobil 2011e).
In a supporting, static 72 hour Pseudokirchneriella subcapitata growth inhibition test (OECD 201, KS=1), 10000 cells/mL were exposed to the Water Accommodated Fraction (WAF) of thermally cracked gas oils (MRD-10-604) at nominal concentrations of 0.32, 1.6, 8.0, 40 and 200 mg/L. The 72 hour EL50 was 8.82 mg/L and the NOELR was 0.32 mg/L based on growth rate (ExxonMobil 2012f).
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 algal 72-hr EL50 value is 0.202 mg/L.
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