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
No.:
#3
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 is used under highly controlled conditions and, therefore, exposure of the terrestrial environment is low.
  • The substance hydrolyses very rapidly in contact with water, generating HCl and silanetriol. Further hydrolysis of silanetriol is then expected to occur rapidly to monosilicic acid. Both silanetriol and monosilicic acid exist only in dilute aqueous solutions and readily condense at concentrations above approximately 100 -150 mg/L as SiO2 to give a dynamic equilibrium between monomer, oligomers and insoluble amorphous polysilicic acid. These hydrolysis products are inorganic substances which enter natural biogeochemical cycles; degradation studies are not relevant.