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Sediment toxicity

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Description of key information

The 10d-LC50 and 10d-NOEC for the marine sediment amphipod Corophium volutator were reported to be respectively 537 and 171 mg/kg sediment (dw) (geometric mean).

However, as long-term data is not available for this end-point, the environmental risk is assessed using the Petrorisk model.

Key value for chemical safety assessment

Additional information

Short-term studies:

The marine amphipod Corophium volutator was exposed to sediment spiked with Hydrocarbons, C14-C18, n-alkanes, isoalkanes, cyclics, <2% aromatics for 10 days. Fourteen studies were available and give LC50 values. The geometric mean of LC50 is 537 mg/kg sediment (dw). In most of the studies, LC10 were calculated and the geometric mean of the 12 available values is 112.6 mg/kg sediment (dw). At last, the 7 more recent studies reported NOEC values and the lowest one was 100 mg/kg (dw).

The marine mollusc bivalve Abra alba was exposed to sediment spiked with Hydrocarbons, C14-C18, n-alkanes, isoalkanes, cyclics, <2% aromatics for 5 days. Four studies were available and give LC50 values. The 5-day LC50 value ranged from is 36 +/- 11 to 103 +/- 22 mg test substance / kg 8% (dw) standard sediment suspension.

Long-term studies:

No data is available for long-term sediment toxicity.

In accordance with Annex IX column 2, testing does not need to be conducted as the hazard is adequately assessed by equilibrium partitioning.  Substance is a hydrocarbon UVCB: The hydrocarbon block method is used for environmental risk assessment (see REACH guidance, R7, app.13-1). PNECs for hydrocarbon blocks have been derived using aquatic PNECs and the equilibrium partitioning method (EqP) using representative structures. Justification for this approach is provided in Redman et al., 2014. Extension and validation of the target lipid model for deriving predicted no-effect concentrations for soils and sediments. ET&C, Vol. 33, No. 12, pp. 2679–2687. See Product Library tab in “assessment report. PetroRisk information excel” spreadsheet attached to Section 13 for PNEC values.

 

The aquatic PNECs have been derived using the HC5 statistical extrapolation method and the target lipid model using representative structures. Given the large database of organisms included in the target lipid model, an assessment factor of one has been applied to the HC5.