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
No data on the behavior of tungstic acid in the environment are available.
Abiotic degradation
Tungsten is a stable element and cannot degrade chemically. It can however, sometimes reversibly, participate in numerous chemical reactions that can proceed under a wide range of common environmental conditions. Thereby, different chemical compounds containing tungsten can be formed and also cease to exist, but the process of degradation is not a relevant fate pathway for such compounds (ATSDR, 2005). Although no data were available for tungstic acid, degradation is not relevant for this substance as an inorganic metal compound.
Biotic degradation
In accordance with column 2 of REACH Annex VII, a test for ready biodegradability does not need to be conducted, as the substance is inorganic. The process of biodegradation is not a relevant fate pathway for inorganic tungsten compounds such as this substance.
Additional information
Due to the formation of a common, soluble tungsten ion (tungstate) at a similar rate between tungstic acid (target substance) and tungsten metal (source substance), these substances are expected to have a similar bioaccumulation potential. In addition, due to a much lower solubility of the tungstic acid (target substance) compared to sodium tungstate (source substance), the resulting bioaccumulation potential of tungstic acid compared to sodium tungstate is expected to be significantly lower, so the usage of sodium tungstate is appropriate to adequately capture the worst-case bioaccumulation potential of tungstic acid (target substance) in the environment. For more details refer to the attached description of the read-across approach (Annex 3).
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.
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