Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways


Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Half-life of (2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate was 110 days at pH 5, 11 days at pH 7, and 4 hours at pH 9. 

Key value for chemical safety assessment

Additional information

The disappearance of (2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate was measured over a pH range of 4 to 9 at 40 °C. The rate of hydrolysis increased with increasing alkalinity. Without correcting for adsorbed substance, apparent half-lives were 9 h at pH 9, 10 d at pH 7 and 100 d at pH 5. Half-lives were 11 days at pH 4, 5 days at pH 7, and 0.5-1 day at pH 9.1. The hydrolysis product 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid has a half-life of more that 21 d in water.

In a similar study, again, the rate of hydrolysis increased with increasing alkalinity, and followed first order kinetics. There was a reversible adsorption of the substance onto the silanized glass walls of the reaction vessels. With correction for adsorbed substance, half-lives of (2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate were 4 h at pH 9, 11 d at pH 7 and 110 d at pH 5. Two degradation products could be identified, and the accumulated transformation product of the two identified substances was 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid.