Registration Dossier
Registration Dossier
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EC number: 231-975-2 | CAS number: 7783-03-1
Endpoint summary
Administrative data
Description of key information
Toxicity to Soil Macroorganisms: No sufficiently reliable studies were identified for tungstic acid toxicity in soil macroorganisms; therefore, read-across to sodium tungstate was used The 56-day NOEC for earthworms (Eisenia fetida) found in a test conducted according to OECD 222, under GLP standards, and with analytical verification of the test concentrations was ≥1000 mg sodium tungstate/kg soil dw (586 mg W/kg). Other studies with Eisenia fetida were not considered for the risk characterisation, as they were found to be less reliable.
Toxicity to Terrestrial Plants: No sufficiently reliable studies were identified for tungstic acid toxicity in plants; therefore, read-across to sodium tungstate was used. In a Seedling Emergence and Seedling Growth Test using Avena sativa, Raphanus sativus and Lactuca sativa and testing sodium tungstate, Lactuca sativa (lettuce) was found to be the most sensitive species with an identified NOEC of 37 mg/kg soil d. w. sodium tungstate (nominal) (approximately 22 mg W/kg soil) based on: % Emergence, Individual Shoot Height, and Individual Shoot Weight.
Toxicity to Soil Microorganisms: No sufficiently reliable studies were identified for tungstic acid toxicity in soil microorganisms; therefore, read-across to sodium tungstate was used. In both a Carbon and a Nitrogen Transformation Test using sodium tungstate the 28-day EC50 was found to be > 1000 mg sodium tungstate/kg soil d.w. (approximately 586 mg W/kg soil d.w.).
Additional information
No toxicity data for soil microorganisms (except arthropods), terrestrial plants, and soil microorganisms are available for tungstic acid (target substance). However, toxicity data on the source substances, sodium tungstate and tungsten metal, are available and are used for read-across. For more details on the read-across rationale for sodium tungstate and tungsten metal, refer to the attached description of the read-across approach.
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