Registration Dossier

Ecotoxicological information

Toxicity to terrestrial arthropods

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

No toxicity test data are available for exposure of sodium borohydride to terrestrial arthropods  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, terrestrial toxicity data for boric acid was used.

Key value for chemical safety assessment

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

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 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 from Folsomia candida (28 day EC10) with a reported value of 15.5 mg B/kg resulting in an endpoint of 48.2 mg NaBH4/kg.

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