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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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.