Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

A series of studies were done to determine the environmental fate of Benzenesulfonic acid, C10-13-(linear) alkyl derivs., calcium salt. Results of a hydrolysis study done at three different pHs gave mean results of -16.66% hydrolysis at pH 5, -25.59% hydrolysis at pH 7, and -18.59% hydrolysis at pH 9 after 5 days, indicating the substance is hydrolytically stable. Phototransformation is not expected to be significant mechanism of degradation. Results of a biodegradation test show that the substance is readily biodegradable. A bioaccumulation study on the analog substance linear alkylbenzene sulfonic acid sodium salt, shows that this material is not expected to bioaccumulate.

Note that the endpoint records reflect data from CaDDBS 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 linear alkylbenzene sulfonic acid with alkyl chain lengths ranging from C10to C14.The primary difference between the two moieties is the salt – either sodium or calcium. Given their structural and functional similarities, the LAS material is a good analogue for read-across for instances where data are available on it but not on CaDDBS. In both cases the alkyl chain length varies and so specific LAS and CaDDBS may be used in some of the testing for which data are provided in this section. When available the specific LAS or CaDDBS 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.

Categories Display