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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

72h EC50 (Desmodesmus subspicatus; growth rate) = 11 mg/L (nominal concentration, EU Method C.3)
72h NOEC (Desmodesmus subspicatus; growth rate) = 3 mg/L (nominal concentration, EU Method C.3)

Key value for chemical safety assessment

EC50 for freshwater algae:
11 mg/L
EC10 or NOEC for freshwater algae:
3 mg/L

Additional information

Since no reliable aquatic algae test is available for C8-14AS TEA (CAS 85665-45-8), in accordance to Regulation (EC) 1907/2006 Annex XI, 1.5, a read-across to other structurally related category members was conducted. Read-across data from the following substances were used: C12-14AS TEA (CAS 90583-18-9), C12-14AS Na (CAS 85586-07-8), C8-isoAS Na (CAS 126-92-1) and C12AS Na (CAS 151-21-3). Toxicity of alkyl sultates is dependent on the carbon chain length and the influence of the counter ion can be neglected.

The key study investigating toxic effects of C12-14AS TEA (CAS 90583-18-9) to freshwater algae Desmodesmus subspicatus was performed according to EU Method C.3 and GLP principles (Scholz 1996). Growth inhibition caused by the test substance was determined after 24, 48 and 72 h of exposure under static conditions to seven test concentrations up to 300 mg a.i./L (nominal values in agreement with the measured values). The results show that the 72-hour EC50 value for growth rate was 11 mg a.i./L for growth rate and 9.3 mg a.i./L for biomass (nominal concentrations). The NOEC value for growth rate was determined to be 3 mg a.i./L (nominal concentration). Due to structural and property similarities with the tested category member these results apply also to C8-14AS TEA (CAS 85665-45-8). The average composition of C8-14AS TEA (CAS 85665-45-8) is C8: 13.6%, C10: 13.6%, C12: 50%, C14: 22.7%. Since two major components are C12 and C14, an EC50 of 11 mg/L and NOEC of 3 mg/L (both for growth rate) are considered as reliable for C8-14AS TEA (CAS 85665-45-8).

Additionally, a supporting GLP-compliant study with Desmodesmus subspicatus is available for C12-14AS Na (CAS 85586-07-8, Scholz 1995). This test was performed according to EU Method C.3. Algae were exposed to six test concentrations up to 20 mg/L (nominal concentration corresponding to 17 mg/L of measured concentration). The study resulted in the 72-hour EC50 value for growth rate of above 20 mg a.i./L (nominal concentration). The EC10 (72 h) for growth rate was 5.4 mg a.i./L (nominal concentration). One study investigating toxic effects of C8-isoAS Na (CAS 126-92-1) to freshwater algae Desmodesmus subspicatus is available (Scholz 1995). The test was performed according to EU Method C.3 and is GLP compliant. Growth inhibition caused by the test substance was determined after 24, 48 and 72 h of exposure to five test concentrations up to 511 mg a.i./L (measured concentration equal to 900 mg a.i./L of nominal concentration). The results show that the 72-hour EC50 value for growth rate was above the highest test concentration of 511 mg a.i./L (measured concentration). The 72-hour EC10 value for growth rate was determined to be 199 mg a.i./L (measured concentration). Moreover, a GLP compliant study was performed with C12AS Na (CAS 151-2-3) according to DIN 38412, part 9 guideline (Rieche 1994). Aquatic algae of Desmodesmus subspicatus species were exposed for 72 hours to four test concentrations up to 120 mg/L as nominal concentrations. Analytical check of test concentrations showed that the nominal concentrations were in agreement with the measured ones and therefore the nominal concentrations were used. The 72-h EC50 value for growth rate was above 120 mg/L (nominal concentration). The NOEC value for biomass was 30 mg/L (nominal concentration). These results are supported by a publication of Nyholm and Damgaard (1990). The non-GLP, test was performed with Pseudokirchnerella subcapitata exposed to six test concentrations. No special guideline was followed and analytical monitoring of test concentrations was not performed. Growth rate measurement after 96-h resulted in the ErC50 value of 117 mg/L (nominal concentration). NOEC for growth rate was 12 mg/L (nominal concentration).