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EC number: 270-115-0
CAS number: 68411-30-3
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
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
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.
is the primary means of degradation for LAS. LAS is considered readily
biodegradable in water, sediment and soil.
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