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Sediment toxicity

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Description of key information

In accordance with Column 2 of REACH Annex X, long-term toxicity testing with sediment organisms (required in Section 9.5.1) is not needed as the chemical safety assessment according to Annex I indicates that this is not necessary.

Key value for chemical safety assessment

Additional information

In accordance with Column 2 of REACH Annex X, long-term toxicity testing with sediment organisms (required in Section 9.5.1) is not needed as the chemical safety assessment according to Annex I indicates that this is not necessary.

 

Furthermore, although effects can be observed in some laboratory studies with sediment dwelling organisms, the lowest concentrations at which they have been found to occur are well below natural background concentrations (typically 4.5% dry weight in freshwater and marine sediment). Sediment organisms are adapted to background concentrations and laboratory test data indicating effects at concentrations below background therefore have no practical significance for setting PNECs.

 

Anoxic and low pH conditions in sediments may result higher concentrations of the more toxic ferrous iron species but such conditions are only conducive to supporting specialist species. Testing of species that are adapted to conditions of low pH and anoxia might be justified but only to investigate specific exposure scenarios.