Registration Dossier
Registration Dossier
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EC number: 265-053-6 | CAS number: 64741-52-2 A complex combination of hydrocarbons produced by vacuum distillation of the residuum from atmospheric distillation of crude oil. It consists of hydrocarbons having carbon numbers predominantly in the range of C15 through C30 and produces a finished oil with a viscosity of less than 100 SUS at 100°F (19cSt at 40°C). It contains relatively few normal paraffins.
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
Read across justification
No standard toxicity test data were found for unrefined / acid-treated oils. However, the potential effects of unrefined / acid treated oils can be predicted from aquatic toxicity data from studies of distillate aromatic extracts. This is valid for the following reasons: Unrefined / acid treated oils contain aromatic hydrocarbons, the quantities of which are substantially reduced through more severe refining steps. These aromatic compounds extracted from unrefined / acid treated oils are the primary constituents in distillate aromatic extracts, which are produced as by products in the refining of lubricant base oils. Therefore, aquatic toxicity data from studies of distillate aromatic extracts will provide a basis for a ‘worst case’ hazard assessment for the aromatic fraction contained in unrefined /acid treated oils.
The data on the acute toxicity of DAEs to Pseudokirchneriella subcapitata confirms that there is variability in toxicity of test samples within this category, probably as a result of variable composition of the DAEs. In a read-across biomimetric extraction screening study conducted using WAFs at 1000 mg/L loading rate with five DAEs (including CAS numbers 64742- 05-8 and 64742-04-7) only one sample (a light paraffinic distillate solvent, CAS number 64742-05-8) proved to have a positive BE result, all others were non-detect. In a subsequent read-across key 72 -hour alga (Pseudokirchneriella subcapitata formerly Selenastrum capricornutum) toxicity test (OECD 201; KS =1), the freshwater alga was exposed to the WAF of a distillate aromatic extract (light paraffinic distillate solvent; CAS # 64742-05-8) at nominal concentrations of 0.1, 1, 10, 100, and 1000 mg/L. The 72 -hour EL50 was calculated to be 18.8 mg/L and the NOEL was 0.1 mg/L based on the slope of the growth rate (ExxonMobil, 2010b).
Supporting data estimated from the PETROTOX computer model show no toxicity of unrefined / acid treated oil to aquatic algae at or below its maximum attainable water solubility (Redman et al., 2010b). These data support the applied read across.
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