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Environmental fate & pathways

Hydrolysis

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Description of key information

The stability of the substance towards hydrolysis was determined (Bayer, 1999a). Based on kinetic parameters, the following dissipation half-lives were derived:
pH 4 (25 °C): t1/2: 529.88 h (extrapolation)
pH 4 (50 °C): t1/2: 34.92 h
pH 7 (50 °C): t1/2: 1.48 h
pH 9 (50 °C): t1/2: 0.98 h
The assumption that the ester functions were hydrolysed was proven by LC-MS. It could be shown that up to two ester functions within one molecule were cleaved by hydrolysis forming carboxylic acid functions. No further analysis was performed to determine the exact identity of the hydrolysis products.
Using the van´t Hoff´s rule the dissipation half-lives at 25°C for pH 7 and pH 9 were calculated:
pH 7 (25°C): t1/2: 7.89 h
pH 9 (25°C): t1/2: 5.21 h

Key value for chemical safety assessment

Half-life for hydrolysis:
7.89 h
at the temperature of:
25 °C

Additional information

Based on the available results it can be stated that the substance is stable under acidic conditions, whereas the dissipation half-life decreases with increasing pH-values.