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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

No terrestrial toxicity data are available for trimethyl borate since the compound rapidly hydrolyzes in water with a half-life of less than 1 second to form methanol and boric acid. Methanol is much less toxic to terrestrial organisms compared to boric acid. Therefore, terrestrial toxicity data for boric acid was used.

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for soil dwelling arthropods:
148.96 mg/kg soil dw

Additional information

No terrestrial toxicity data are available for Trimethyl borate since the compound hydrolyzes in water with a half-life of less than 1 second to form methanol and boric acid. Methanol is much less toxic to environmental organisms compared to boric acid. Thus, PNEC values derived for boric acid are protective of the environment for the stoichiometric contribution of methanol .Therefore, terrestrial toxicity data compiled on boric acid was used to derive a PNECsoil. The endpoints included in the dossier under environmental hazard assessment were reported from studies on the ecotoxicity of boron and various compounds, such as boric acid (H3BO3), anhydrous sodium tetraborate (Na2B4O7), and hydrated sodium tetraborates (Na2B4O7. xH2O).

The geometric mean of the most sensitive endpoint of the most sensitive test species was used for the PNEC derivation. The most sensitive endpoint was juvenile production fromFolsomia candida(28 day EC10) with a reported value of 15.5 mg B/kg resulting in an endpoint of 148.96 mg C3H9BO3/kg.

Given the high solubility and low Kow for Boron no terrestrial toxicity studies are proposed for Trimethyl borate.