Registration Dossier
Registration Dossier
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EC number: 932-051-8 | CAS number: -
Biodegradation in water and sediment: simulation tests
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. There are however two OECD Guideline 308 studies with the major component of the reaction product, linear akylbenzene sulfonate (LAS) that demonstrated considerable aerobic biodegradation in sediment. The 11.6 day half-life in sediment is for mineralization of the test substance.
Key value for chemical safety assessment
- Half-life in freshwater sediment:
- 11.6 d
Additional information
The biodegradation of C12LAS (linear alkylbenzene sulfonate) in sediment was evaluated in two aerobic die-away studies; one using sediment from Lytle Creek, Wilmington, Ohio and the other using sediment from the Ohio River. In Lytle Creek sediment, after 148 days, 60.8% was mineralized, 14.4% was associated with solids, 1.4% was metabolites, and 24.5% remained as parent. The rate constants for primary biodegradation and mineralization were 1.5 day-1 and 0.06 day-1, respectively. In Ohio River sediment, after 92 days, 42.1% was mineralized, 28.5% was associated with solids, 0% was metabolites, and 29.8% remained as parent. The rate constants for primary biodegradation and mineralization were 0.5 day-1 and 0.06 day-1, respectively. The 11.6 day half-life in sediment is for mineralization of the test substance.
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