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Environmental fate & pathways

Biodegradation in soil

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Description of key information

The disappearance of LAS from sludge-amended soils was investigated from 51 fields on 24 farms in the Thames Water Authority. 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. Estimated half-lives in soil were between 7 and 22 days.

Key value for chemical safety assessment

Half-life in soil:
22 d
at the temperature of:
25 °C

Additional information

The disappearance of sodium 4-undecylbenzene sulfonate (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. Estimated half-lives in soil were between 7 and 22 days.

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