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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

14d EC0 (Brassica rapa, seedling emergence and growth) > 1000 mg/kg soil d.w. (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 study with terrestrial plants is available for C16-18AS Na (CAS 68955-20-4). The key non-GLP study followed the procedure for phytotoxicity testing on Avena sativa and Brassica rapa, 14 d, UBA Berlin, 3/1984 (Steber 1988). Plants were exposed to the test substance for 14 days in artificial soil. The 14-day EC0 value for Brassica rapa based on seedling emergence and growth was above 1000 mg a.i./kg soil d.w (nominal concentration).

Moreover two additional studies of reliability 4 are available (secondary quotation, OECD SIDS 2007). The non-GLP short-term test with Japanese raddish (Raphanus sativus, dicots) and oat (Avena sativa, monocots) and tomato plant (Lycopersicon esculentum, dicots) was performed according to EEC ring test, C(L1)3: Higher Plant, EEC-Directive 79/831, 1986 (Henkel, 1995).

An early seedling growth toxicity test was carried out for 14 days in laboratory conditions. The lowest NOEC value based on seedling growth was obtained for Raphanus sativus and reached 300 mg/kg soil (nominal concentration). The NOEC values for Avena sativa and Lycopersicon esculentum were above 1000 mg/kg soil (nominal concentrations). No analytical measurements are available. The other non-GLP test performed according to EEC ring test, C(L1)3: Higher Plant, EEC-Directive 79/831 (1986), was carried out for 21 days. Japanese radish (Brassica rapa) and oat (Avena sativa) were tested in laboratory conditions in the early seedling growth toxicity test. The NOEC value for Brassica rapa was 300 mg/kg soil d.w. (nominal concentration) and for Avena sativa the NOEC value was 1000 mg/kg soil d.w. (nominal concentration). No analytical measurements are available.

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).