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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

 


Discussion (screening testing)


The key study is an activated sludge die-away biodegradation test using non-adapted and adapted activated sludge. This study resulted in a rapid degradation of the test substance in particular under abiotic and non-adapted conditions, indicating that the substance itself is rapidly degraded. However as almost no mineralisation was observed and the substance was not readily biodegradable in standard tests on ready biodegradation, further investigations on the degradation products are proposed. In a first approach the substance can be regarded as inherently biodegradable.


The following information is taken into account for any hazard / risk / persistency assessment:


The key study is an activated sludge die-away biodegradation test using non-adapted and adapted activated sludge. This study resulted in a rapid degradation of the test substance in particular under abiotic and non-adapted conditions, indicating that the substance itself is rapidly degraded. However as almost no mineralisation was observed and the substance was not readily biodegradable in standard tests on ready biodegradations, further investigations on the degradation products are proposed.


Soil:


From the simulation testing it appears that the substance undergoes rapid primary degradation. 


In the aerobic transformation in soil test, the substance can be seen to be oxidized to the major metabolite (≥ 10% AR) M18 (C29H42O2) to form a structure with a maximized number of conjugated double bonds. This structure is amenable to β-oxidation yielding the isomeric metabolites M14 and M15 (C29H42O3). At least, the metabolite M15 is cleaved under formation of the further major metabolites (≥ 10% AR) M5 (C15H22O2) and M8.


 

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