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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

NOEC (28 d and 56 d) >= 1000 mg/kg dw for Eisenia fetida (OECD 222, read across)

Key value for chemical safety assessment

Additional information

No experimental data evaluating the toxicity of Fatty acids, C12-16 (even numbered) and C18- unsatd., methyl esters (CAS No. 1234694-02-0) to soil macroorganisms are available.Therefore, toxicity data from two structurally related analogue substances are used as read-across (methyl laurate (CAS No. 111-82-0) and methyl palmitate (CAS No. 112-39-0)) in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. All three substances are fatty esters esterified with methanol, containing fatty acid components with C-chain lengths of C12 (CAS No. 111-82-0), C16 (CAS No. 112-39-0) and C12-16 (even numbered) and C18 unsaturated (CAS No. 1234694-02-0), respectively. The log Kow values of these substances (> 5) indicate high adsorption potential to soil particles. Methyl laurate (CAS No. 111-82-0) exhibits the highest toxicity to aquatic organisms (Daphnia and algae) throughout the whole SCAE Me category, with EC50 and NOEC values < 1 mg/L. Therefore, methyl laurate is used as worst-case read across substance. Based on the above information and the fact that the target substance contains C12 fatty acids (40-50%) and C16 fatty acids (up to 15%) the use of data from methyl laurate and methyl palmitate as read-across for Fatty acids, C12-16 and C18 unsatd., methyl esters is considered justified.

 

The toxicity of methyl laurate (CAS No. 111-82-0) and methyl palmitate (CAS No. 112-39-0) to earthworms was evaluated by Winkelmann (2013) in tests performed according to OECD 222. In both studies, Eisenia fetida was exposed to the test substance for 56 days at a concentration of 1000 mg/kg dw (limit test). Mortality and growth were evaluated after 28 days whereas reproduction was evaluated after 56 days. After the exposure period, no effects on earthworm’s survival, reproduction or growth were observed, leading to NOEC values >= 1000 mg/kg dw.

 

Based on the results obtained for the structurally related category members (in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5), it can be concluded that Fatty acids, C12-16 (even numbered) and C18-unsatd., methyl esters (CAS No. 1234694-02-0)will not exhibit toxicity to soil macroorganisms.