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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

14d EC50 (Eisenia fetida, mortality) > 1000 mg/L (nominal concentration, UBA Berlin 3/1984)

Key value for chemical safety assessment

Additional information

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 available for C16-18AS Na (CAS 68955-20-4) were used, since toxicity of alkyl sulfates is dependent on the carbon chain length.

One reliable short-term study with Eisenia fetida is available for C16-18AS Na (CAS 68955-20-4, Steber 1988). The study followed the procedure for toxicity testing with the earthworm Eisenia foetida (Savigny) in artificial soil (USA, 14 d), UBA Berlin 3/1984. Earthworms were exposed to the test substance for 14 days in artificial soil. No analytical measuremets are available. The 14-day EC0 value based on mortality was above 1000 mg a.i./kg soil d.w.

Besides, the Equilibrium Partitioning Method is sufficient to calculate the PNECs values for the terrestrial compartment. The substance exhibits an adsorption coefficient (log Koc) below 5 and is readily biodegradable. Moreover, the substance is not acutely toxic in the aquatic compartment (EC/LC50 for fish, Daphnia and algae above 1 mg/L). In case of exposure to soil, the substance is expected to rapidly degrade, thus the hazard to terrestrial organisms is negligible. Hence, the Equilibrium Partitioning Method is sufficient to calculate the PNECs values for the terrestrial compartment according to the “Guidance on information requirements and chemical safety assessment Chapter R.7c: Endpoint specific guidance”, Section 7.11.6 Integrated Testing Strategy for Effects on Terrestrial Organisms (ECHA 2008).