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Sediment toxicity

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According to section 1 of Reach Annex XI, performing of a test is scientifically unjustified. Reach guidance document R7b states that a log Pow should be used as a trigger value for assessing sediment toxicity. For the substance, a log Kow of 6.11 was calculated. However, the substance hydrolyses rapidly to either oligomeric or polymeric ureas. The ureas are insoluble in water and therefore not bioavailable.
For the risk characterisation of the sediment compartment, a PNEC sediment has been derived on the basis of the equilibrium partition theory from aquatic toxicity data. As the risk characterisation yields a PEC/PNEC ratio smaller than 1, a test towards sediment dwelling organisms is not necessary as the risk towards the sediment compartment is sufficiently described based on the already available data.

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