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Environmental fate & pathways

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Description of key information

No data on the behavior of ammonium metatungstate 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 amount 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 ammonium metatungstate. 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.

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