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Ecotoxicological information

Sediment toxicity

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Description of key information

waiver based on the readily biodegradability and low absorption potential of the test substance, exposure to sediment organisms is unlikely

Key value for chemical safety assessment

Additional information

There are no reliable toxicity data for sediment-dwelling organisms relating to FX511. A waiver is applied for this endpoint as the substance has low potential for adsorption to sediment and low exposure potential as the substance is readily biodegradable.

 

In accordance with REACH Regulation 1907/2006, Annex X, Column 2, studies of the effects on sediment organisms need not be conducted if exposure assessment indicates no concern for exposure to environmental compartments. 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 FX511 will be biodegraded within the STP process and as a consequence a transfer to the sediment 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 FX511 was determined in a reliable study (Walker 2012) where the measured log Kow is 2.98. Therefore, FX511 is considered to have low potential for absorption to sediment. Based on the readily biodegradability and low absorption potential of the test substance, exposure to sediment organisms is unlikely. Also, direct and indirect exposure is unlikely as the substance is not directly applied to sediment. No significant exposure of the sediment compartment is therefore expected and additional information on the effects of the substance and its degradation products on soil micro-organisms are therefore not required.