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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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biodegradation in water: sediment simulation testing
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other justification
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Description of key information

According to column 2 of Annex IX further testing on biodegradation in water and sediment should be considered if the chemical safety assessment indicates the need to investigate further the degradation of the substance and its degradation products. Based on the ready biodegradability study (and any other information on degradation on screening level) conducted with the substance it was concluded that the substance is not readily biodegradable (maximum percentage degradation 43% after 28 days in a ready biodegradability screening test (62 % after prolongation to 61 days)). Based on these results it may be feasible to change this conclusion more favourably, because the substance may not have been fully available to bacteria (test concentration 100 mg/L versus water solubility 10 mg/L). The conclusion on the non-ready biodegradability is conservative. With using this result in the CSA further investigation of biotic degradation is not triggered.

Key value for chemical safety assessment

Additional information