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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Under the conditions of the present study with Pseudokirchneriella subcapitata, Pymorolac reduced growth rate of this fresh water algae species significantly at 0.027 mg/l and higher.  Because of structural similarity and similar physico-chemical properties, Pymordiol, by read-across, is expected to have the same effect in aquatic systems. Further justification of the read-across is attached to the Aquatic Toxicity endpoint summary. 
The EC50 for yield inhibition (72h-EYC50) was 0.011 mg/l with a 95% confidence interval ranging from 0.007 to 0.016 mg/l.
The 72h-NOEC for growth rate reduction was 0.0031 mg/l.
The 72h-NOEC for yield inhibition was below 0.0013 mg/l.

Key value for chemical safety assessment

EC50 for freshwater algae:
0.039 mg/L

Additional information