Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

1,1,3,3 -tetramethylbutylperoxydecanoate displays bioaccumulation potential as indicated by a Log Kow of >6.5. However the hydrolysis 1,1,3,3 -tetramethylbutylperoxydecanoate occurs rapidly with a half-life of between 9 and 15 hours at environmentally relevant pH. There are some inaccuracies in the hydrolysis test measurements due to the difficulties associated with measuring the test substance at such low levels. For this reason an absolute worst case value for hydrolysis is stated as <24 hours. Measurements from ecotoxicological testing suggest this to be faster however. When considering the additional thermal instability of the test substance (SADT 15ºC) this substance is classified as themally instable by the UN and can therefore the parent peroxide cannot persist at temperatures of 15 ºC or above. Furthermore the reactive nature of the peroxide bond has a strong tendency to react with organic matter and metal ions and will therefore subsequently degrade rapidly in the environment. In conclusion 1,1,3,3 -tetramethylbutylperoxydecanoate is not able to persist in order to bioaccumulate. Furthermore the extremely low water solubility and hence low biological availability also indicates that 1,1,3,3 -tetramethylbutylperoxydecanoate is unlikely to bioaccumulate.

Due to the lack of ready biodegradation in the closed bottle test it is evident that the degradation products of 1,1,3,3 -tetramethylbutylperoxydecanoate will persist longer in the environment than the parent molecule. The predicted (Epiwin) log Kow of the main degradation product (2,2,4,trimethyl pentan-2 -ol) is <3.0 and therefore does not have a high potential to accumulate.The predicted BCF for the main degradation product is low at 30.63 (Epiwin).With the data available there is no reason to expect bioaccumulation of the primary degradation product.

Additional information