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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key 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.

Key value for chemical safety assessment

Additional information

Reliable measured data for simulation testing on ultimate degradation in surface water or sediment are 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 does indicates there is no need to investigate further the degradation of the substance and its degradation products. It is proposed that testing is waived as exposure potential is negligible as the substance is an intermediate product. The test substance is a monomer where the solid product is blended with non-aqueous substances. Once polymerised the substance is chemically bound into the polymer matrix of the article therefore there is no downstream exposure. There is negligible exposure to aqueous process streams during downstream use and hence also negligible emission to a sewage treatment plant. Therefore, exposure to aquatic or sediment organisms is negligible.

 

In accordance with Column 2 of REACH Annex IX, the simulation test sediment (required in 9.2.1.4) does not need to be conducted as direct or indirect exposure of sediment isnegligible. Exposure potential is expected to be negligible as the substance is an intermediate product. There is negligible exposure to aqueous process streams during downstream use and hence also negligible emission to a sewage treatment plant. Also, the substance has a very low log octanol-water partition coefficient (Log Kow) of 0.41 at a neutral pH indicating low adsorptive potential. Therefore, no testing is necessary based onnegligible exposure. Identification of degradation products (required in Section 9.2.3) is also not necessary.