Registration Dossier
Registration Dossier
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EC number: 236-743-4 | CAS number: 13472-45-2
Endpoint summary
Administrative data
Description of key information
Toxicity to soil macroorganisms:
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.
Toxicity to terrestrial plants:
In a Seedling Emergence and Seedling Growth Test using Avena sativa, Raphanus sativus and Lactuca sativa 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/L) based on: % Emergence, Individual Shoot Height, and Individual Shoot Weight.
Toxicity to soil micro-organisms:
In both a Carbon and a Nitrogen Transformation Test using sodium tungstate the 28-day EC50 was found to be > 1000 mg/kg soil d.w. (sodium tungstate concentration) (nominal) (approximately 586 W/kg).
Toxicity to Birds:
Several older studies on chicken species were identified in which the birds were fed varying amounts of tungsten, in the form of sodium tungstate in their diets. The NOAELs identified from these studies ranged from approximately 45-500 mg tungsten/kg, depending on which endpoints were examined in each study. However, none of these studies were conducted with standard methodology and they were deemed to be less than reliable.
Additional information
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