Registration Dossier
Registration Dossier
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EC number: 273-234-6 | CAS number: 68953-96-8 This substance is identified by SDA Substance Name: C11-C13 branched alkyl benzene sulfonic acid calcium salt and SDA Reporting Number: 25-097-06.
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The Branched CaDDBS biodegraded 2.9% at 28 days in an OECD Guideline 301E study. In an additional study in which fish were exposed to 1 mg/L of the Branched alkylbenzene sulfonate for 196 days, 97.8% biodegradation occurred.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
The biodegradability of Branched CaDDBS was determined in accordance with OECD Guideline 301E. Results indicate only limited biodegradation, with a final biodegradation of 2.9% at 28 days. The substance is not readily biodegradable. In addition, in another study conducted on branched alkylbenzene sulfonate, the most water soluble component of Branched CaDDBS, 11 fish were exposed to 1 mg/L of test substance for 196 days. The test substance was labelled with sulfur-35 in order to determine the amount that biodegraded. Results at the end of the test period show that the test substance was 97.8% biodegraded in 196 days. Analysis of the amount of radiolabeled sulfur in the suspended solids and in the fish shows that most of the test substance was removed by biodegradation rather than adsorption or bioaccumulation. Based on these data Branched CaDDBS does not meet the criteria for ready biodegradability but is expected to undergo almost total primary degradation over extended periods of time.
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