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Registration Dossier
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EC number: 269-781-5 | CAS number: 68333-25-5 A complex combination of hydrocarbons obtained by treating light catalytic cracked distillates with hydrogen to convert organic sulfur to hydrogen sulfide which is removed. It consists of hydrocarbons having carbon numbers predominantly in the range of C9 through C25 and boiling in the range of approximately 150°C to 400°C (302°F to 752°F). It contains a relatively large proportion of bicyclic aromatic hydrocarbons.
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
In a key, semi-static 21 day Daphnia magna chronic toxicity test (OECD 211, KS=1), one daphnid/replicate was exposed to the Water Accommodated Fraction (WAF) of light catalytic cracked gas oil (MRD-10-576) at nominal concentrations of 0.05, 0.10, 0.18, 0.34 and 0.65 mg/L. The 21 day NOELR was 0.05 mg/L based on growth and reproduction and 0.18 mg/L based on mortality (ExxonMobil 2012d).
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 freshwater invertebrate NOEL (No Observed Effect Level) value is 0.053 mg/l based on immobility and numbers of live young produced per adult by Day 21.
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