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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Based on the ready biodegradability study conducted with the substance, it is concluded that the substance is not readily biodegradable. According to column 2 of Annex X, further testing on biodegradation should be considered if the chemical safety assessment indicates the need to further investigate the degradation of the substance and its degradation products. With the available information on the substance, the chemical safety assessment indicates that the risks in water, sediment and soil compartments are controlled and no further information will have to be provided. However, to conclude on the PBT properties of the substance, a simulation testing on ultimate degradation in surface water was planned. The definitive study is ongoing and performed according to OECD TG 309. Besides studying the rate of biodegradation, the degradated products will be identified as well in this definitive study. The experimental design is based on a 12 -day preliminary study ( Eurofins EAG Agroscience 2021). According to this preliminary study, the substance is likely to be persistent in the surface water compartment. If the findings in the ongoing definitive study confirm this conclusion, then a simulation testing of biodegradation in water: sediment or soil will be unnecessary.

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