Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

PHOTODEGRADATION

Direct photolysis in air, water and soil

The UV Spectrum of the registration substance shows a small shoulder at >290 nm so that direct photolysis may occur.

Indirect photolysis in air, water and soil

Indirect photolysis via OH radical or ozone reaction is fast (Half-life 0.5 -1d). This means indirect photolysis is a possible fate pathway.

HYDROLYSIS

N-Methyl acetamide, CAS No. 79-16-3 has a half-life of 38000 years (pH7, 25 deg C, Reference: Mabey, W. and Mill, T.  1978.  Critical Review of Hydrolysis of Organic Compounds in Water Under Environmental Conditions.   J. Phys. Chem. Ref. Data  1978, 7(2): 383-415). Hall et al have compared the rate of the alkaline hydrolysis of cyclic imides e.g. N-Methyl succinimide, CAS No. 1121-07-9 with the rate measured for the corresponding acyclic substance e.g. N-Methyl acetamide. They found equal or slower hydrolysis for the cyclic compound. The registration substance contains a (cyclic) N-alkyl succinimide moiety and it can be concluded that hydrolysis under environmental conditions (pH 4 to 9, 12 deg C) is comparable to N-Methyl acetamide mentioned before. Because of this extremely long half-life a hydrolysis study is not warranted.