Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Hydrolysis is not a relevant process for tungsten dioxide, as in principle, water acts as an oxidizing agent with tungsten compounds (Lassner and Schubert, 1999). The behavior of the substance in water is more accurately examined through the Transformation/Dissolution testing protocol (see Table 5 in section 1.3).

Additional information

No data on bioaccumulation or levels of tungsten dioxide in aquatic organisms are available. However, bioaccumulation/bioconcentration of tungsten metal and inorganic tungsten compounds such as tungsten dioxide is not expected to occur in aquatic or sediment species, as the bioavailability of tungstate (the bioavailable form) from tungsten compounds is expected to be low in the water column due to stream and river sediment adsorption and low potential for leaching from soils. Furthermore, any uptake mediated by transport proteins would be expected to be internally regulated. The absence of methylated tungsten species also supports the claim that bioaccumulation is not expected to be of concern for tungsten and inorganic tungsten compounds.

Bioaccumulation of tungsten in terrestrial organisms after tungsten dioxide exposures are not expected based on BCFs calculated from paired concentrations of tungsten in soil and worm or soil and plant tissue (read-across from tungsten metal and sodium tungstate).

Based on reported Kd values for tungsten compounds in soil and sediment, their mobility in respective compartments is expected to be low.