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Sediment toxicity

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Key value for chemical safety assessment

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Testing for sediment toxicity is not considered necessary because:

In accordance with Annex XI, section 2, the long-term toxicity effects studies to sediment dwelling organisms (required in Section 9.5.1) do not need to be conducted as the study is technically not possible. This is due to the very short sediment half-life once desorbed (see the discussion of Biodegradation in water and sediment for further details), preventing maintenance of exposure concentrations for the duration of either a standard short-term or long-term test. Therefore, sediment hazard assessment is based on the EQPM PNECs derived from the aquatic data.

PNECsediment has been calculated from PNECfreshwater on the basis of the equilibrium partitioning method.