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M4Q is predicted to hydrolyse with a half-life >200 - 2000 h at pH 7 and 25°C, based on an accepted estimation method
A half-life of 9 days for reaction with hydroxyl radicals in air has been calculated for M4Q. Phototransformation in water and soil are not expected to be significant removal processes for M4Q.
Biodegradation of 0% in 28 days has been read-across from a structurally-related substance M3T.

Table 4.1.12 Degradation rates

Degradation rate in water:

Hydrolysis half-life >200-2000 hours at pH 7 and 25°C for removal of parent (QSAR). No significant biodegradation of silanol hydrolysis product expected. 

Degradation rate in sediment:

No data are available regarding degradation in sediment.

Degradation rate in soil:

No data are available regarding degradation in soil.

Degradation rate in air:

Rate constant for reaction with OH radicals in air: 1.79 E-12 cm3 molecule-1 second-1 (half-life 9 days) (Calculated)

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