Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Substance characterisation

The test substance Ethylhexyl Methoxycinnamate is poorly soluble in water and it has a high octanol-water partition coefficient (log Kow >6). In the environment it will partition mainly to the organic matter in sediment and soil. This is shown by the value of the organic carbon partitioning coefficient Koc which was estimated at 13290 L/kg (log Koc 4.1). The test substance is readily biodegradable and it also degrades under anaerobic conditions. Hydrolysis is not a relevant degradation process. Phototransformation in water will result in rapid degradation of trans Ethylhexyl Methoxycinnamate to the cis-isomere. When further phototransformation is considered, the test substance degrades with a DT50 in the range of 5 -9 days.

The substance will bioaccumulate from the water phase but to a lower extent then expected based on its high log Kow. The BioConcentration Factor of Ethylhexyl Methoxycinnamate in fish was found to be 279 -433 at 70 µg/l and 64 -175 at 700 µg/l.

Classification and PBT

This means the substance does not fulfil the criteria for bioaccumulative and persistent (as part of PBT and vPvB). The substance does not need to be classified as a chronic hazard for the environment according to the CLP criteria. Due to the fact that Ethylhexyl Methoxycinnamate is readily biodegradable, has no acute aquatic toxicity (see CSR section 7.1) and a BCF >100 the substance does not need to be classified in the environment according the classification criteria of the Dangerous Substances Directive 1272/2008 EC and under the EU directive 67/748 EEC.

Environmental concentrations

Predictions of the concentration in surface water due to cosmetic use of the test substance in cosmetics are at the level of 0.1 to 4 microgram per liter. Monitoring results from Switzerland (1998) and United Kingdom (2000) ranged from < 1 and 28 ng/l showing that the predictions are too high by three orders of magnitude.