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Ecotoxicological information

Ecotoxicological Summary

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Administrative data

Hazard for aquatic organisms

Hazard for air

Hazard for terrestrial organisms

Hazard for predators

Additional information

Aquatic PNECs were derived using the PETROTOX model and the soil and sediment PNECs were calculated using the equilibrium partitioning method.

Conclusion on classification

The toxicity of alkenes with the same carbon number is expected to be similar, irrespective of the positioning of the double bond. The reason for this is that these alkenes are neutral organic hydrocarbons which act via non-polar narcosis. The acute toxicity observed is due to the uptake of the chemical (proportional to log Kow) and then disruption of the function of biological membranes. Alkenes with the same carbon number have very similar log Kow and therefore would be expected to have similar toxicities. Toxicity increases with carbon number from C6-C12, as log Kow increases.  At carbon numbers above this acute toxicity is not observed at the limits of solubility.

 

The carbon number range of alkenes C11/13/14 covers this cut off. Therefore, the lower carbon number components are acutely toxic at concentrations below their solubility (acute effects on algae and daphnia are observed at <1mg/l of dodec-1-ene) whilst the higher carbon number components show no acute toxicity. A UVCB that covers this carbon number range may or may not therefore express this toxicity, dependant on the proportion of the differing carbon lengths. To cover this eventuality, it is decided to adopt a precautionary attitude (in the absence of data on the specific substance) and assign the  classification of 'R50/R53 very toxic to aquatic organisms and may cause long term adverse effects in the aquatic environment' under the DSD Directive and ‘Acute and Chronic Category 1’ under the EU CLP Regulations.