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Ecotoxicological information

Sediment toxicity

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Description of key information

The 10d-LC50 and 10d-NOEC for the marine sediment reworker Corophium volutator were reported to be 519 and 100 mg/kg sediment (dw) respectively.
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

No sediment toxicity studies are available for the registered substance itself. However, reliable data are available for another substance in the relevant carbon number range.

Short-term studies:

Two series of studies were available for assessing sediment toxicity: one dealing with a marine sediment reworker amphipod Corophium volutator, the other one with a marine filter-feeding bivalve Abra alba.

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 519 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 studies with Abra alba are considered as weight of evidence as the bivalve molluscs were exposed not to spiked sediment, but to a suspension of sediment in seawater. The production of fecal pellets was reduced and EC50 were determined from 36 mg/kg dw sediment suspension to 103 mg/kg dw sediment suspension.

Long-term studies:

No data is available for long-term sediment toxicity.

Substance is a hydrocarbon UVCB. Standard tests for this endpoint are intended for single substances and are not appropriate for this complex substance. However, this endpoint is characterized for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see library tab in PETRORISK spreadsheet attached in section 13).

These results are read across to Hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics.