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EC number: 287-335-8
CAS number: 85480-55-3
dissociates in water to its constituents MEA and LAS. LAS is readily
biodegradable in soil, as detailed below, and therefore MEA-LAS is also
expected to be readily biodegradable in this environmental compartment.
1 (C10-13 LAS):
of C10 -13 LAS, sodium salt from sludge-amended soils was investigated
from 51 fields on 24 farms in the Thames Water Authority (United
Kingdom). Sludge was applied by subsurface injection or surface
spreading. Sampling was conducted for up to 122 days. In fields not
recently spread with sludge, the concentrations of LAS found in the
sludge amended soil were generally less than 1 mg/kg. In fields recently
spread, the concentrations in soil were in the range of < 0.2 to 20
mg/kg, representing losses of LAS between 70 and 99% of the estimated
total cumulative load. The authors conclude that overall the data
indicate that an adequate safety margin exists between the
concentrations of LAS in sludge-amended soils and those likely to affect
the growth of crop plants. Half-lives compare well with those for
ultimate degradation in lab soil tests (with 14C-evolution), indicating
that the degradation of LAS does not lead to the formation of
significant levels of breakdown intermediates in soil (Holt, 1989).
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