Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Abiotic degradation

C12-C18 TMAC is hydrolytically stable at pH 5, 6.2, 7.0 and 9.0 since only less than <10% degradation was hydrolysed at all aqueous pH systems over a 30 day period. In addition since C12-C18 TMAC is readily biodegradable, abiotic degradation is considered to be of limited relevance for its environmental fate.

Biotic degradation

In an OECD guideline biodegradation study, C12-C18 TMAC was shown to be readily biodegradable (75% in 28 days). It can therefore be reasonably assumed that the test substance degrades in the environment under aerobic conditions without formation of persistent degradation products. Consequently biodegradation under aerobic conditions is considered the most relevant fate process in the aquatic and terrestrial environment.

Biodegradation in water and sediment

In a continuous activated sludge (CAS) test, a total mean removal of 99.998% and 0.016 to 0.023 % removal via adsorption to sludge was observed with read across substance C12 -C16 ADBAC. This demonstrated that C12-C16 ADBAC biodegrades almost completely in conventional biological waste water treatment plants. Based on the adopted read-across approach, C12 -C18 TMAC is expected to follow the same biodegradation profile in water and sediment.

Biodegradation in soil

A biodegradation study resulted in 64% biodegradation of the read-across substance C12-C16 ADBAC in a loam soil at Day 70, with a DT50value of 40 days. Based on the adopted read-across approach, C12 -C18 TMAC is expected to follow the same biodegradation profile in soil.