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
The substance is classified as Aquatic Chronic 2 (H411).
Note that the endpoint records reflect data from Branched CaDDBS where available, and in some cases, from the analogue sodium salt of linear alkylbenzene sulfonate (commonly known as LAS). LAS is the sodium salt of linear alkylbenzene sulfonic acid with alkyl carbon chain lengths ranging from C10to C13and averaging 11.6. The primary structure is a C10to C13linear alkyl chain with apara-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 C11to C13.The primary difference between the two moieties are the salt – either sodium or calcium, and the alkyl chain - either linear or branched. Given their structural and functional similarities, the LAS material is a good analogue for read-across for instances where data are not available 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 and CaDDBS are used in the text.
Overall, and based on the data for Linear and Branched alkylbenzene sulfonates (BAS), linear structures are more toxic than branched structures. Therefore, data on linear materials, e.g., the chronic aquatic studies using LAS, are considered to be a worst case scenario.
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