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Registration Dossier
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EC number: 309-865-1 | CAS number: 101316-59-0 A complex combination of hydrocarbons obtained by fractionation from hydrodesulphurised coker distillate stocks. It consists of hydrocarbons having carbon numbers predominantly in the range of C12 through C21 and boiling in the range of approximately 200°C to 360°C (392°F to 680°F).
Short-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 static 48 hourDaphnia magnaacute toxicity test (OECD 202, KS=1), five daphnids/ replicate were exposed to the Water Accommodated Fraction (WAF) of light cracked gas oil (MRD-10-595) at nominal concentrations of 0.05, 0.15, 0.45, 1.35 and 4.05 mg/L. The 48 hour EL50 was 0.32 mg/L based on mobility (ExxonMobil 2012a).
In a supporting static 48 hourDaphnia magnaacute toxicity test (OECD 202, KS=1), five daphnids/ replicate were exposed to the Water Accommodated Fraction (WAF) of light cracked gas oil (MRD-10-578) at nominal concentrations of 0.05, 0.15, 0.45, 1.35 and 4.05 mg/L. The 48 hour EL50 was 0.7 mg/L based on mobility (ExxonMobil 2012b).
In a supporting static 48 hourDaphnia magnaacute toxicity test (OECD 202, KS=1), five daphnids/ replicate were exposed to the Water Accommodated Fraction (WAF) of light catalytic cracked gas oil (MRD-10-576) at nominal concentrations of 0.102, 0.256, 0.640, 1.60 and 4.00 mg/L. The 48 hour EL50 was 0.51 mg/L based on mobility (ExxonMobil 2011c).
In a supporting static 48 hourDaphnia magnaacute toxicity test (OECD 202, KS=1), five daphnids/ replicate were exposed to the Water Accommodated Fraction (WAF) of light thermal cracked gas oil (MRD-10-604) at nominal concentrations of 0.32, 1.6, 8.0, 40 and 200 mg/L. The 48 hour EL50 was 5.8 mg/L based on mobility (ExxonMobil 2012c).
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 48-hr EL50 value is 0.319 mg/L.
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