Registration Dossier
Registration Dossier
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EC number: 271-808-0 | CAS number: 68608-89-9 This substance is identified by SDA Substance Name: C11-C13 branched alkyl benzene sulfonic acid sodium salt and SDA Reporting Number: 25-097-04.
Endpoint summary
Administrative data
Description of key information
Additional information
The endpoint records reflect data on the sponsored substance BABS Na salt, also known in early studies as tetrapropylenebenzenesulfonate (TBS) or sodium branched-chain alkylbenzene sulfonate. For hydrolysis, the endpoint record reflects data from analogue substance Benzenesulfonic acid, C10-13-(linear) alkyl derivs., calcium salt (calcium dodecyl benzene sulphonate) or CaDDBS. The CaDDBS structure is a C10to C13linear alkyl chain with a para-substituted benzene sulfonic acid calcium salt group attached at any of the secondary alkyl chain carbon positions. The average alkyl chain length is C11-C13. The primary differences between BABS Na salt and CaDDBS are the salt – either sodium or calcium and whether the alkyl chains are branched or linear. Given the structural similarities (both areparaC11-C13 alkylbenzene sulfate salts), CaDDBS is a good analogue for read-across for instances where data are available on it but not on BABS Na salt. CaDDBS is hydrolytically stable and BABS Na salt is expected to be the same. The biodegradation of BABS Na salt was measured directly; the material degraded only 6% in 30 days and therefore does not meet the criteria for ready biodegradation.The recent biodegradation study from BABS read-across used as read-across was also determined the substance as not readily biodegradable.However, a second studywith BABS Na showed that BABS Na salt degraded 97% in 196 days and therefore is capable of undergoing extensive primary biodegradation. In the weight of evidence approach, the substance considered as inherently biodegradable.
For bioaccumulation, two representative compounds for BABS Na salt were modeled: a highly branched structure (1,1,2,2,3,3,4-heptamethylpentyl benzenesulfonic acid, sodium salt, and a less branched structure (1,3,5,7-tetramethyloctyl benzene sulfonic acid, sodium salt). Both compounds are C12-BABS Na salts, the most common homologue present in BABS Na salt. The two compounds represent compounds likely to be present in BABS Na salts and represent compounds that are respectively at the extremes of being highly branched or less highly branched based on the chemistry used to manufacture BABS Na salt. The resultant calculated bioconcentration factor (BCF) was 3.162 (Log BCF = 0.5).
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