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EC number: 293-917-2
CAS number: 91648-55-4
14d EC50 (Eisenia fetida, mortality) > 1000 mg/soil d.w. (nominal
concentration, UBA Berlin 3/1984)
In accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a
read-across to another structurally related substance 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 fetida
(Savigny) in artificial soil (USA, 14 d), UBA Berlin 3/1984. Earthworms
were exposed to the test substance for 14 days in artificial soil. 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. 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).
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