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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

The Chemical Safety Assessment according to Annex I of Regulation (EC) No 1907/2006 does not indicate the need to investigate further the long-term effects on aquatic invertebrates.

Key value for chemical safety assessment

Additional information

No experimental data on long-term toxicity to aquatic invertebrates are available for (Z)-octadec-9-enyl (Z)-docos-13-enoate (CAS 17673-56-2). The chemical safety assessment according to Annex I of Regulation (EC) No 1907/2006 does not indicate the need to investigate further the long-term toxicity to aquatic invertebrates. No effects were observed in short-term studies with fish, aquatic invertebrates and aquatic algae. Additionally, the concentration of (Z)-octadec-9-enyl (Z)-docos-13-enoate in surface water is expected to be very low due to the low water solubility (< 0.05 mg/L) and the ready biodegradability. Due to the low water solubility only low concentrations of this substance are expected to be bioavailable and present in water. Since (Z)-octadec-9-enyl (Z)-docos-13-enoate is readily biodegradable this substance will be eliminated in sewage treatment plants to a high extent. The high adsorption potential further promotes rapid removal from waste water. If fractions of this chemical were to be released in the aquatic environment, the concentration in the water phase will be reduced by rapid biodegradation and potential of adsorption to solid particles and to sediment. Thus, long-term exposure to aquatic organisms is not expected due to the low bioavailability of the substance in the aquatic compartment.

In conclusion, as no effects were observed in the short-term studies and only low concentrations of the test substance are expected in the aquatic compartment, no chronic toxicity to aquatic invertebrates up to the water solubility is expected. Therefore, no further long-term test with aquatic invertebrates is required for (Z)-octadec-9-enyl (Z)-docos-13-enoate.