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Environmental fate & pathways

Hydrolysis

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Description of key information

The estimated half-lives at 25°C of the test item are:
pH 4: Estimated half life at 25°C: 84.5 days
pH 7: Estimated half life at 25°C: 449 days
pH 9: Estimated half life at 25°C: >1 year

Key value for chemical safety assessment

Half-life for hydrolysis:
449 d
at the temperature of:
25 °C

Additional information

The determination was carried out using a procedure designed to be compatible with Method C7 Abiotic Degradation, Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.

The kinetics of the study has been determined to be consistent with that of a pseudo-first order reaction.

It has been observed that the rate of hydrolysis increases with a decrease in pH.

The rate constants and estimated half-lives at 25°C of the test item are shown in the following table:

pH

Rate constant (hr-1)

Estimated half-life at 25°C

4

3.42 x 10-4

84.5 days

7

6.43 x 10-5

449 days

9

-

>1 year