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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

With Mecoprop-P n-octyl ester no toxic effects against fish were observed at the limit of water solubility under exposure conditions. The determined 96h-EC50 was >1 mg/L. 
For Mecoprop-P acid (MCPP-P acid), the hydrolysis product of Mecoprop-P n-octyl ester, a 96h-LC50 of 76 mg/L and a 96h-NOEC of 42 mg/L were determined.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
76 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 to fish.


Several studies with various species are available Mecoprop-P acid (MCPP-P acid) and Mecoprop-P dimethylamine salt (MCPP-P DMA). Therefore only those data with most sensitive value available for the hydrolysis product of Mecoprop-P n-octyl ester was chosen for further assessment.