Registration Dossier
Registration Dossier
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EC number: 265-181-2 | CAS number: 64742-78-5 A complex combination of hydrocarbons obtained by treating an atmospheric tower residuum with hydrogen in the presence of a catalyst under conditions primarily to remove organic sulfur compounds. It consists of hydrocarbons having carbon numbers predominantly greater than C20 and boiling above approximately 350°C (662°F). This stream is likely to contain 5 wt. % or more of 4- to 6-membered condensed ring 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 hourPseudokirchneriella subcapitatagrowth inhibition test (OECD 201, KS=1), 10000 cells/mL were exposed to the Water Accommodated Fraction (WAF) of heavy cracked fuel oils (MRD-10-579) at nominal concentrations of 0.05, 0.23, 1.01, 4.56 and 20.5 mg/L. The 72 hour EL50 was 0.32 mg/L and NOELR was 0.05 mg/L based on growth rate (EMBSI 2012b).
In seven reliable supporting 72-hour algae (Pseudokirchnerella subcapitata)toxicity studies using WAF methodology, the EL50 values based on growth rate and biomass varied between 0.75 to >107 mg/L and 0 - <300mg/L, respectively (EMBSI, 2008j,k,l,m; Shell, 1997a, b).
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