Registration Dossier
Registration Dossier
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EC number: 932-051-8 | CAS number: -
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with column 2 of REACH Annex IX not required: substance is readily biodegradable. However, a field monitoring study reported significant degradation (70-99% in 122 days) of the linear alkylbenzenesulfonate (LAS), the major constituent of the reaction product, applied in wastewater sludge to soil. The 14 day hal-flife (estimated as >7 - <22 days) is for the parent compound.
Key value for chemical safety assessment
- Half-life in soil:
- 14 d
Additional information
The disappearance of LAS from sludge-amended soils was investigated from 51 fields on 24 farms in the Thames Water Authority. 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 are in the range of 0.2 to 20 mg/kg, representing losses of LAS between 70 and 99% of the estimated total cumulative load.
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