Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 215-231-4
CAS number: 1314-35-8
Tungsten trioxide was not tested for toxicity to soil macro-organisms,
and read-across to sodium tungstate was used for this endpoint. In an
earthworm reproduction test using Eisenia fetida and
testing sodium tungstate, the NOEC was found to be greater than or equal
to the highest concentration tested (≥1000 mg sodium tungstate/L, or
approximately 586 mg W/L).
Tungsten trioxide was not tested for toxicity to terrestrial plants, and
read-across to sodium tungstate was used for this endpoint. In a Seedling
Emergence and Seedling Growth TestusingAvena
sativaand testing sodium tungstate, Lactuca
sativa (lettuce) was found to be the most sensitive
species, with an identified NOEC of37 mg/kg
soil dw sodium tungstate (nominal) (approximately 22 mg W/L) based
on Individual Shoot Weight.
In addiiton, tungsten trioxide was not tested for toxicity to soil
micro-organisms and read-across to sodium tungstate was used for this
endpoint. In both a Carbon and a Nitrogen Transformation Test using
sodium tungstate the 28-day EC50 was found to be > 1000 mg/kg soil dw
(sodium tungstate concentration) (nominal) (approximately 586 mg W/kg).
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
Due to similar or lower
transformation/dissolution results for tungsten trioxide (the target
substance) than sodium tungstate (the source substance), the resulting
toxicity potential would also be expected to be similar or lower, so
read-across is appropriate. In addition, read-across is justified
because the classification and labelling is the same or less severe for
the target substance PBT/vPvB profile is the same. Finally, the dose
descriptors are, or are expected to be, sufficiently similar or higher
for the target substance, and read-across to the source substance is
adequately protective. For more details, refer to the read-across
category approach description in the Category section of this IUCLID
submission or Annex 3 of the CSR.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again