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Environmental fate & pathways

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The ready biodegradation of Benzenesulfonic acid, C10-13-(linear) alkyl derivs., calcium salt, was determined according to an OECD Guideline 301B study. A concentration of 16 mg/L of test substance was inoculated with activated sludge and monitored for 28 days. The test substance was biodegraded 109% in 28 days, and met the 10 day window criterion. In addition, the disappearance of LAS from sludge-amended soils was investigated from 51 fields on 24 farms in the Thames Water Authority. Sludge was applied and sampling measured LAS concentrations for up to 122 days, with the concentrations of LAS found in the sludge amended soil 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. Based on these data the CaDDBS is considered readily biodegradable.