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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Reference
Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is highly insoluble in water
the study does not need to be conducted because the substance is readily biodegradable
the study does not need to be conducted because direct and indirect exposure of sediment is unlikely
other:

Description of key information

In accordance with column 2 of REACH Annex IX, Simulation testing on ultimate degradation in surface water and sediment simulation testing (required in section 9.2.1.2 and 9.2.1.4) was not conducted as the substance is highly insoluble in water and hydrolytically unstable (see IUCLID5 section 5.1.2). In addition, in a biodegradation study (MITI, 2011), the test substance Sika Hardener LH was completely hydrolyzed to 2,2-dimethyl-3-oxopropyl dodecanoate and hexamethylenediamine. These converted products were biodegraded. The percentage (average) of biodegradation by BOD was 91% after 28 days. Further, the test substance is considered to be readily biodegradable. From experience in handling and use it is very unlikely that direct and indirect exposure of sediment occurs, as the substance rapidly hydrolysis in contact with water. In addition the substance is incorporated in a polymer during professional and consumer use and is thus not present in the environment as such.

Key value for chemical safety assessment

Additional information