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Sediment toxicity

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Description of key information

This endpoint is waived due to exposure considerations.

Key value for chemical safety assessment

Additional information

In accordance with column 2 of REACH Annex X, the long term toxicity to sediment organisms study does not need to be conducted as the chemical safety assessment according to Annex I has not indicated a need to investigate further the effects of the substance and/or degradation products on sediment organisms.

In support, two studies are available which have determined the toxicity of benzyl butyl phthlate to sediment organisms in freshwater aquatic (non-sediment) scenarios.

Call (2001) reports 10 -day LC50 values of 0.46, >1.76 and 1.23 mg/L of the susbtance to Hyalella azteca, Chironomus tentans, and Lumbriculus vanegetus respectively.

Calvert (1982) reports 48 hr LC50 and NOEC values of the substance to Chironomus tentans of 1.64 and 1.25 mg/L respectively.

As neither of these studies concern a test performed with sediment, the equilibrium partitioning method will be used to calculate the sediment PNECs.