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Registration Dossier
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EC number: 265-111-0 | CAS number: 64742-11-6 A complex combination of hydrocarbons obtained as the extract from a solvent extraction process. It consists predominantly of aromatic hydrocarbons having carbon numbers predominantly in the range of C20 through C50. 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
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 biomimetic extraction screening study conducted using WAFs at 100 mg/L loading rate with five DAEs (including CAS# 64742- 05-8 and 64742-04-7) only one sample (a light paraffinic distillate solvent, CAS# 64742-05-8) proved to have a positive BE result, all others were non-detect (ExxonMobil, 2010e).
In a subsequent supporting 72 -hour alga (Pseudokirchneriella subcapitata formerly Selenastrum capricornutum) toxicity test (OECD 201; KS =1) the freshwater alga was exposed to WAFs of two DAE samples at a nominal concentration of 100 mg/L. The samples included the one with the positive BE result, a light paraffinic distillate solvent (CAS# 64742-05-8) and one of the samples with a non-detect BE result, a heavy paraffinic distillate solvent (CAS# 64742 -04 -7). The 72-hour EL50 values were estimated to be <100 mg/L and >100 mg/L, respectively (ExxonMobil, 2012d).
In a subsequent key 72 -hour alga (Pseudokirchneriella subcapitata formerly Selenastrum capricornutum) toxicity test (OECD 201; KS =1), the freshwater alga was exposed to WAFs of the sample with the positive BE result, a 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, 2012c).
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