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Sediment toxicity

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Description of key information

Toxic effects on sediment dwelling invertebrates can be excluded.

Key value for chemical safety assessment

Additional information

No studies on long-term sediment toxicity are available for this substance. Due to the high Koc a considerable adsorption to sediment and soil is indicated. However, 2-ethyl-2-[[(1-oxooleyl)oxy]methyl]-1,3-propanediyl dioleate (CAS-No. 57675-44-2) has been shown to be readily biodegradable, hence it can be assumed that it will be completely biologically degraded within the sediment transport process. Therefore, no chronic exposure of sediment dwelling organisms is expected. Furthermore, Fatty acid esters are metabolised in Fatty acids and alcohols. These components naturally occur in sediment and soils, are part of physiological pathways and can be used as energy source. The enzyme carboxylesterase is omnipresent in the environment, readily degrading this test substance. Thus, toxic effects caused by the metabolites of fatty acid esters are implausible.

In conclusion, due to a) the observed absence of toxicological effects on aquatic organisms, b) the lack of chronic exposure and c) the, acknowledged metabolisation of fatty acid esters, toxic effects on sediment dwelling invertebrates can be excluded.