Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The hydrolysis half-live at pH = 7 of the test substance was considered to be < 2 minutes.

The test item can be considered to be not ready biodegradable but inherently biodegradable.

Additional information

Hydrolysis

The hydrolysis rate of the test substance at pH = 4, 6, 7 and 9 (at room temperature) was investigated using FIMS (Flow Injection Mass Spectrometry). Short- and long-term measurements show that the test substance hydrolyzed faster at pH 4, 6 and 7 than at pH 9. FIMS data showed that at pH = 7 after 2 minutes only a weak signal of the test substance could be detected. Thus the hydrolysis half-live at pH = 7 was considered to be < 2 minutes.

Biodegradation

The ready biodegradability of the test item was assessed over a 28 day period in a closed bottle test (OECD No. 301 D, 1992 and EU method C 4-E) . The percentage biodegradation of the test substance reached a mean of 24.8 % after 28 days based on its ThODNH4. Therefore the test item can be considered to be not ready biodegradable but inherently biodegradable.

The reference item sodium benzoate was sufficiently degraded to a mean of 67.6 % after 14 days, and to a mean of 71.9 % after 28 days of incubation.