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Environmental fate & pathways

Hydrolysis

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Description of key information

Whereas the substance is stable at pH 7 (halflife > 1 year), at pH4 the substance was unstable (halflife of 68 hours (3 days) at 25 °C) and at pH 9 a lower degradation rate (3576 hours (149 days) at 25 °C) was found.

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

The test for hydrolysis of the test item was performed at 50.0 °C ± 0.1 °C at each of pH 4.0, pH 7.0 and pH 9.0.

FAT 40825/A was found to be stable at pH 7.0 and 50 °C. Therefore no further testing was performed at this pH-value.

As significant abiotic degradation of FAT 40825/A was seen in the pre-test at pH 4.0 and at pH 9.0, further testing was performed at elevated temperatures in order to calculate the rate constant (k25) and the half-life time of the hydrolysis at pH 7.0, pH 9.0 at 25 °C. The results are summarised below:

FAT 40825/A at pH 4.0 has a half-life time of 68 hours (3 days) at 25 °C.

FAT 40825/A is stable at pH 7.0. Its half-life time is longer than one year at 25 °C.

FAT 40825/A at pH 9.0 has a half-life time of 3576 hours (149 days) at 25 °C.

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