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Short-term toxicity to aquatic invertebrates

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Description of key information

48h EC50 (Daphnia magna, immobilization) > 100 mg/L (nominal concentration)

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
100 mg/L

Additional information

Since no reliable short-term test with aquatic invertebrates is available for C9AS Na (CAS 1072-15-7), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to another structurally related category members was conducted. Read-across data from two pure homologues: C8AS Na (CAS 142-31-4) and C10AS Na (CAS 142-87-0) were used. As the toxicity of alkyl sulfates is dependent on the carbon chain length, it is expected that the C10 homologue will be the worst case scenario for the C9 homologue.

The key, GLP short-term toxicity test with C8AS Na (CAS 142-31-4) with Daphnia magna was performed according to OECD guideline 202 (Neven 1993). Daphnids were exposed under semi-static conditions to five test concentrations up to 100 mg/L (nominal concentrations in agreement with the measured ones). Based on mobility of daphnids, the 48-hour EC50 value was determined to be above 100 mg/L (nominal concentration).

Two supporting 24-hour tests with Daphnia magna are available for C10AS Na (CAS 142-87-0). The first non-GLP study was performed following an AFNOR T.90301 (1974) method (Lundahl and Cabridenc 1978). The obtained results showed that the 24-hour EC50 value was 800 mg/L (nominal concentrations). Analytical measurements are not available. The other non-GLP study with Daphnia magna followed a method described by Norme Francaise Homologue, 1983, NF T90-31 (Sanchez Leal 1991). The 24-hour EC50 value was 470 mg/L. Analytical check of the test concentrations was not provided.

Due to structural and property similarities with the tested category member, it can be concluded that the above result applies also to C9AS Na (CAS 1072-15-7). It is expected that the 48-hour EC50 value for aquatic invertebrates will be above 100 mg/L.