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Diss Factsheets

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Waiver: testing is not necessary as substance is readily biodegradable.

Key value for chemical safety assessment

Additional information

Reliable measured data for simulation testing on ultimate degradation in surface water or sediment is not available. However, a waiver is being applied for simulation testing on ultimate degradation in surface water and ultimate degradation in sediment.

 

In accordance with Column 2 of REACH Annex IX, further biotic degradation testing does not need to be proposed if the chemical safety assessment indicates there is no need to investigate further the degradation of the substance and its degradation products. Testing is waived as potential for exposure is low as the substance is readily biodegradable. In the environment, ready biodegradability means it can be assumed that KEL3587 will be biodegraded within the STP process and as a consequence a transfer to the terrestrial compartment via STP effluent is not expected. Furthermore, for substances not passing the STP-process but being readily biodegradable, it can be assumed that they will be also biologically degraded in the surface water within a short time. Additionally, the partition coefficient of KEL 3587 was determined in a reliable study (Frischman 2012) where the measured log Kow is <=- 0.46. Therefore, KEL 3587 is considered to have low potential for absorption to soil and sediment. Based on the readily biodegradability of and low absorption potential of the test substance, exposure to aquatic or sediment organisms is unlikely.

 

In accordance with Column 2 of REACH Annex IX, the simulation test for sediment (required in 9.2.1.4) does not need to be conducted as direct or indirect exposure of sediment is unlikely. Exposure potential is expected to be unlikely as the substance is readily biodegradable. In the environment, ready biodegradability means it can be assumed that KEL3587 will be biodegraded within the STP process and as a consequence a transfer to the aquatic compartment via STP effluent is not expected. Furthermore, for substances not passing the STP-process but being readily biodegradable, it can be assumed that they will be also biologically degraded in the surface water within a short time. Also, the substance has a very low log octanol-water partition coefficient (Log Kow) of <=- 0.46 at a neutral pH indicating low adsorptive potential. Therefore, no testing is necessary based on unlikely exposure. Identification of degradation products (required in Section 9.2.3) is also not necessary.