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
No data on the behaviour of sodium tungstate in the environment are available. Hydrolysis is not a relevant process for tungsten substances, as in principle, water acts as an oxidising agent with tungsten. Tungsten is a stable element and cannot degrade chemically, then the process of degradation is not a relevant fate pathway for tungsten substances. Furthermore, the process of biotic or abiotic biodegradation is not a relevant fate pathway for inorganic metal elements such as tungsten. Environmental data for tungsten metal and sodium tungstate are presented in the adsorption/desorption section. The soluble species (tungstate, WO42-) released are expected to be similar for each of the tungsten substances and are thus expected to behave similarly in the environment. However, the number of soluble species resulting from tungsten metal and sodium tungstate is different, with sodium tungstate being much more soluble. Overall, data for sodium tungstate and tungsten metal are expected to adequately capture the range of mobility of sodium tungstate. For more details, refer to the description of the read-across category approach in Annex 3 of the CSR.
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 sodium tungstate, 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
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