Registration Dossier
Registration Dossier
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EC number: 266-358-7 | CAS number: 66423-13-0
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Desmodesmus subspicatus was exposed under static conditions for 72 h to one concentration (1 mg/l) of Mecoprop-P n-octyl ester. No toxic effect was observed at the limit of water solubility under exposure conditions.
For Mecoprop-P acid (MCPP-P acid), the hydrolysis product of Mecoprop-P n-octyl ester, a 72h-EC50 of 23.9 mg/L and a 72h-NOEC of 5.96 mg/L were determined on the alga Anabaena flos-aquae.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 23.9 mg/L
- EC10 or NOEC for freshwater algae:
- 5.96 mg/L
Additional information
Mecoprop-P n-octyl ester hydrolyses rapidly in natural water. Therefore, the hydrolysis product Mecoprop-P acid (MCPP-P acid) was used for further assessment of Mecoprop-P n-octyl ester with respect to toxicity on alga related to growth rate.
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