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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Cenospheres are not harmful to algae

Key value for chemical safety assessment

Additional information

One study (Migchielsen, 2010) according to OECD 201 is used as key study. The tested fly ash was structural related to ash (residues), cenospheres and as cenospheres are a component of fly ash, these results can be used as read across.

Under static test conditions algae were exposed to a series of water accommodated fractions up to a loading rate of 100 mg/L. Algal growth was assessed by spectrophotometric measurements at 24 h intervals. No reduction of algal growth or inhibition of yield compared to the control could be observed during an exposure period of 72 h. The EL50 could not be determined as they were beyond the range tested, exceeding a loading rate of 100 mg/L. NOEL for all ashes equalled a loading rate of 100 mg/L. Based on these findings the substance is not to be harmful to algae and it can be concluded that cenospheres are also not harmful to algae.