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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 REACH 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 is used under highly controlled conditions and, therefore, exposure of the aquatic and sediment environments is low

          The substance hydrolyses rapidly and the silanol hydrolysis product has a low log Kowvalue 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.