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.
Endpoint summary
Administrative data
Description of key information
Additional information
Note that the endpoint records reflect data from Branched CaDDBS where available, and in some cases, read-across from the analogue sodium salt of linear alkylbenzene sulfonate (commonly known as LAS) or branched alkylbenzene sulfonate (ABS). LAS is the sodium salt of linear alkylbenzene sulfonic acid with alkyl carbon chain lengths ranging from C10 to C13and averaging 11.6. The primary structure is a C10 to C13 linear alkyl chain with a para-substituted benzene sulfonic acid sodium salt group attached at any of the secondary alkyl carbon positions. CaDDBS is the calcium salt of branched alkylbenzene sulfonic acid with alkyl chain lengths ranging from C11 to C13. ABS is the branched sodium salt analogue of CaDDBS.
The primary difference between the moieties are the salt – either sodium or calcium, and the alkyl chain - either linear or branched. In addition, for some endpoints four representative Branched DDBS structures were modeled: two highly branched, two less branched, of which two were calcium salts and two sodium salts. This helped provide the relationship for between the registered substance and the read-across structures. One other difference is that the Branched DDBS has limited biodegradability while Linear CaDDBS undergoes much faster biodegradation. This property was taken into consideration in the risk characterization.
Overall, given their structural and functional similarities, the LAS material is a suitable analogue for read-across for instances where data are available on it but not on CaDDBS. For LAS, the alkyl chain length varies and so specific LAS may be used in some of the testing for which data are provided in this section. When available the specific LAS is identified in the endpoint record and the tables in this chemical safety report. For ease of reading, the general terms LAS, ABS, and CaDDBS are used in the text.
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