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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

No toxicity test data are available for exposure of sodium borohydride to soil maroorganisms since the compound rapidly hydrolyzes in water to form sodium borate/boric acid and hydrogen gas with half-lives ranging from seconds to minutes at environmentally relevant pHs. Therefore,  toxicity data for boric acid was used..

Key value for chemical safety assessment

Additional information

No terrestrial toxicity data are available for sodium borohydride.Therefore, toxicity data for the toxicologically relevant hydrolysis product boric acid is applied for the safety assessment

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). Given the high solubility and low Kow for Boron, no terrestrial toxicity studies are proposed for sodium borohydride.