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EC number: 248-130-9
CAS number: 26952-13-6
PNECs were derived using the PETROTOX model and the soil and sediment
PNECs were calculated using the equilibrium partitioning method.
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.
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