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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Key value for chemical safety assessment

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Testing is waived on the basis that the chemical safety assessment according to Annex I indicates that it is not necessary to conduct the simulation test on ultimate degradation in surface water and the sediment simulation test, or to identify degradation products.


Simulation tests (water and sediments) are not considered necessary because:

· The substance hydrolyses rapidly and the silanol hydrolysis product has a low log Kow value and, therefore, exposure of the sediment compartment is expected to be low.  

· The risk characterisation ratios (RCRs) for the aquatic and sediment compartments, based on the assumption that the silanol hydrolysis product is not biodegradable, are <1.  

· The non-silanol hydrolysis product, methanol, is readily biodegradable.