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Environmental fate & pathways

Endpoint summary

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Description of key information

According to the OECD Test Guideline 301C, the registered substance is not readily biodegradable (19% biodegradation after 28 days, calculated from the oxygen consumption) but primarily degrades totally (100% primary biodegradation after 28 days, calculated from direct quantitative analysis by GC method) to form two degradation products: succinic acid (degraded and mineralized completely) and 3,3-dimethyl cyclohexanone (called DMCH, which is present at 100% after 28 days). Therefore, the registered substance is not considered Persistent.

To conclude on the persistence of the relevant degradation product DMCH, a QSAR model was used (CATALOGIC Kinetic 301F v.13.16). DMCH achieves 55% biodegradation after 28 days (not exceeding the 60 % pass level set by the OECD Guidelines for testing of Chemicals (301) for ready biodegradability of a substance) but achieves > 60% of biodegradation after 60 days (62%). Additionally, the predicted ultimate half life is 19 days, well below the threshold value of 40 days and 60 days for Persistence and very Persistence. Therefore, it can be concluded that DMCH is not persistent in the environment.

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