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
No terrestrial bioaccumulation data of sufficient quality are available
for tungsten trioxide (target substance). However, data are available
for tungsten metal (source substance), which are used for read-across.
Due to lower water solubility and lower toxicity for the target
substance compared to the source substance, the resulting read-across
from the source substance to the target substance is appropriate as a
conservative estimate of potential toxicity for this endpoint. In
addition, read-across is appropriate because the classification and
labelling is more protective for the source substance than the target
substance, the PBT/vPvB profile is the same, and the dose descriptors
are, or are expected to be, lower for the source substance. 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.
No data on the behavior of tungsten trioxide in the environment are
available. Bioconcentration data for tungsten metal and sodium tungstate
are used as read-across source substances in this section. The soluble
species released are expected to be similar for each of the compounds,
and are thus expected to behave similarly in the environment. However,
the amount of soluble species resulting from tungsten metal and sodium
tungstate is different, with sodium tungstate being much more soluble.
Therefore, data for sodium tungstate and tungsten metal are expected to
adequately capture the range of bioavailability of tungsten trioxide in
the environment. 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.
Relatively low bioaccumulation of tungsten is observed in sunflower
leaves at soil concentrations of 3900 mg W/kg soil, with calculated
concentration factors plateauing at approximately 0.05 (Johnson et al,
2009). Tungsten concentrations factors calculated for ryegrass were
higher and ranged from 56.1-0.202 (Strigul et al, 2005). However, it
should be noted that, in this study, background levels of tungsten in
the collected soils used for testing were not determined prior to
testing. Tungsten concentrations measured in earthworm tissue ranged
from 1.52-193.2 mg/kg wet weight in soils with tungsten concentrations
of 10-10000 mg/kg soil, respectively (non-aged soil) (Strigul et al,
2005). Additionally, tungsten concentrations of 10 and 10000 mg/kg soil
yielded earthworm tissue concentrations of 3.45 and 25.9 mg/kg wet
weight, respectively (Strigul et al, 2005). Using these paired
concentration data, the BCFs for earthworms in non-aged soils ranged
0.152-0.019 and BCFs for aged soils ranged from 0.345 - 0.00259.
Tungsten concentrations measured in earthworm tissue in another study
with soil spiked with sodium tungstate (Inouye et al, 2006) ranged from
2.9 - 41.3 mg/kg wet weight in soils with tungsten concentrations of <2
- 4643 mg/kg soil, respectively. These data would indicate concentration
factors ranging from 1.45 - 0.008, respectively, with only the lowest
tungsten concentration resulting in a BCF of > 1. Therefore, tungsten
compounds such as tungsten trioxide are not expected to bioaccumulate in
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.
Esta web utiliza cookies para mejorar su experiencia de navegación en nuestros sitios web.
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