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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72 hour EC50 is 100 mg/L and the 72 hour NOEC is 34 mg/L based on growth rate of Selenastrum capricornutum.

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
34 mg/L

Additional information

Two algal studies are available which report results after 72 hours exposure. Both studies used Selenastrum capricornutum in standard OECD 201 studies using closed systems and the effect values are based on measured concentrations. Following the same approach as set out in the EU RAR (2008), as Galassi et al. (1988) only derive an EC50 value with no information available on the no effect level, the results found by TNO (2001) will be used for the further effects assessment. As TNO (2001) reports both EC50 and NOEC, it is used as the key study and this study was also identified as the key study for algal toxicity in the EU RAR for benzene (2008).