Registration Dossier
Registration Dossier
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EC number: 271-802-8 | CAS number: 68608-82-2 A complex combination of hydrocarbons obtained by the alkylation of benzene with ethene. It consists primarily of ethylbiphenyls, diethylbenzenes with lesser amounts of butylbenzenes and polyethylbenzenes.
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
A freshwater algal toxicity test with Selenastrum capricornutum (new name: Pseudokirchnerella subcapitata) exposed to 'benzene, ethylenated, by-products from' and conducted under GLPs and following OECD TG 201 resulted in a 72-hour growth rate EC50 (ErC50) and NOEC of 0.485 and 0.0959 mg/L, respectively.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 0.485 mg/L
- EC10 or NOEC for freshwater algae:
- 0.096 mg/L
Additional information
Two freshwater algal studies with Selenastrum capricornutum (new name: Pseudokirchnerella subcapitata) were available for ‘benzene, ethylenated, by-products from’, with only one considered for assessment for this endpoint. One study was conducted for 72 -hours under GLPs and following OECD Test Guideline 201. The study was considered the key study for this endpoint and concluded that the 72-hour growth rate EC50 (ErC50) and NOEC was 0.485 and 0.0959 mg/L, respectively. The second study was conducted for 96 hours under GLPs and followed standard U.S. EPA test guidelines; however results (EC50 values) were based only on cell counts rather than growth rate; therefore, since the ECHA guidance recommends endpoint values based on growth rate this study was considered a supporting study only.
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