Registration Dossier

Environmental fate & pathways

Biodegradation in soil

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Reference
Endpoint:
biodegradation in soil: simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Transformation products:
yes
No.:
#1
No.:
#2
Details on transformation products:
Degradation of the registration substance is expected to be principally via abiotic transformation under aqueous conditions (such as in a degradation simulation study). Therefore, the transformation products expected in the environment are those identified in the abiotic degradation study (reported in Section 5.1.2 of IUCLID). Environmental hazard assessment is based on the properties of the hydrolysis products.

Description of key information

Key value for chemical safety assessment

Additional information

Testing is waived on the basis that the chemical safety assessment according to Annex I indicates that it is not necessary to conduct the soil simulation test. Simulation test (soil) is not considered necessary because:

 

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

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

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