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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
No specific studies on BABS Na salt were available. However, a series of studies are available on analogue linear alkyl benzene sulfonates (LAS). The LAS 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 chain carbon positions. The alkyl chain length averages 11.6. LAS is structurally similar to BABS Na salt, as both are para C11-C13 alkylbenzene sulfate sodium salts. The primary difference is whether the alkyl chain is linear or branched. Based on structural similarities, LAS is a good analogue for read-across for instances where data are available on it but not on BABS Na salt.
Terrestrial toxicity was examined in a variety of animal and plant species. In a short-term test, earthworms were exposed to LAS concentrations of 0, 63, 125, 250, 500, and 1000 mg/kg dw for 14 days; the 14-day LC50 was > 1000 mg/kg dw, and the NOEC was 250 mg/kg dw. In a longer-term test, adult E. albidus were placed in soil containing the test substance for 21 days; the 21-day EC10 was 6.2 mg/kg dry weight.
For arthropods, Folsomia fimetaria were exposed to various concentrations of LAS in three different soil types for 21 days. Another test was done to compare the toxicity of three LAS salts, Na, Ca, and Mg, in one soil type (sandy). There was little variation in toxicity among the three soil types and in the three salt species. The EC10 for Folsomia fimetariain various soils ranged from 85-93 mg/kg dry weight soil. In another study, H. assimilis and H. aculeifer were exposed to various concentrations of LAS for 21 days. Based on reproduction, the EC10 for H. assimilis was 100 mg/kg dry weight, and the EC10 for H. aculeifer was 82 mg/kg dry weight.
For plants, a series of studies are available on LAS. Based on well accepted principles of modeling (D.W. Roberts, Sci. Total Environ. 109/110: 557-68, 1991), linear structures are more toxic than branched structures of the same carbon chain number so LAS represents a worst-case read-across for BABS Na Salt. Studies included several plant species, e.g., sunflower, sorghum, and mung bean, and measurements such as emergence and growth. The lowest EC50 value obtained was 90 mg/kg soil dw. The lowest EC10 value was 6.2 mg/kg soil dw.
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