Registration Dossier
Registration Dossier
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EC number: 271-807-5 | CAS number: 68608-88-8 This substance is identified by SDA Substance Name: C11-C13 branched alkyl benzene sulfonic acid and SDA Reporting Number: 25-096-00.
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The biodegradation of the test substance sulphonic acid branched alkylate was determined in an OECD 301F ready biodegradability test, which indicated <5% degraded at the end of 28 days. Similarly,BABS Na salt degraded only 6% within 30 days.However, a supporting study in which fish were exposed to 1 mg/L of BAB Na Salt for 196 days show that the test substance was 97.8% biodegraded in 196 days.In the weight of evidence approach, the BAB Acid is considered as inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
The biodegradation of the test substance sulphonic acid branched alkylate was determined in an OECD 301F ready biodegradability test. Biodegradation was followed for 28 days, using sodium benzoate as a reference substance. The reference substance was 68% biodegraded and met the 10 -day window requirement. Therefore the test results are valid. The test substance was <5% degraded at the end of 28 days. The test substance is not readily biodegradable.
As a supporting study, 11 fish were exposed to 1 mg/L of the BAB Na Salt for 196 days, with the substance labeled with sulfur-35 in order to determine 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.
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