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Environmental fate & pathways

Biodegradation in soil

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biodegradation in soil: simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
Transformation products:
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 the 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 moderately rapidly to form (3-chloropropyl)silanetriol and ethanol. The parent substance and the silanol hydrolysis product have log Kow values of 3.13 and -1.1 respectively 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 both the parent substance and the silanol hydrolysis product are not biodegradable, are <1.  

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