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Environmental fate & pathways

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Abiotic degradation

C12-14 ADBAC is expected to be readily biodegradable and therefore data on hydrolysis is not required in accordance with Annex VIII column 2 adaptation of REACH. However, the analogue substance C12-16 ADBAC was shown to behydrolyticallystable with a half-life equal to or greater than one year at pH 4, 7 and 9 at ambient temperatures. Abiotic degradation is therefore considered to be of limited relevance for the environmental fate of ADBAC substances.

Biotic degradation

Valid OECD guideline studies on C12-16 ADBAC have shown the read-across substance to be readily biodegradable, with degradation ranging from 63-95% within 28 days. C12-14 ADBAC is therefore also expected to rapidly degrade in the environment under aerobic conditions without formation of persistent degradation products.

Biodegradation in water and sediment

In a continuous activated sludge (CAS) test with the read-across substance C12-16 ADBAC, a total mean removal of 99.998%, with 0.016 to 0.023% removal via adsorption to sludge, was observed. The same is expected for C12-14 ADBAC.

Biodegradation in soil

A biodegradation study resulted in 64% biodegradation of the analogue substance C12-16 ADBAC in a loam soil at Day 70, with a DT50value of 40 days. The same biodegradation behaviour is expected for C12-14 ADBAC.