Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

LAS was found to be 85% degraded in 29 days. Thus, it is readily biodegradable. Although not a requirement for surfactants, LAS passed the 10-day window.

Because of its readily biodegradability, the simulation tests of biodegradation in surface water and water-sediment can be waived. Nevertheless, four available studies/publications were used as supporting studies. Three of these studies are carried out in aerobic conditions and concluded DT50 values < 23 days in the sediment compartment. In the anaerobic study a high DT50 value of 150 days was established in a marine water and sediment incubation study. This high biodegradation time is likely caused by the anaerobic condition of this study. Anaerobic condition is considered not representative of the real environmental condition. Thus, the result of this study was not used in further risk assessment or PBT assessment.

The disappearance of LAS from sludge-amended soils was reported as having a Half-life = between 7 and 22 days. Half-lives compare well with those for ultimate degradation in lab soil tests (with14-C-evolution), indicating that the degradation of LAS does not lead to the formation of significant levels of breakdown intermediates in soil.

Additional information

Biodegradation is the primary means of degradation for LAS. LAS is considered readily biodegradable in water, sediment and soil.