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No toxicity data of sufficient quality for aquatic organisms are available for ammonium metatungstate (target substance). However, toxicity to aquatic organisms data are available for ammonium paratungstate and sodium tungstate (source substances), which are used in the weight-of-evidence approach for read-across.

Due to similar or lower transformation/dissolution results for ammonium metatungstate (the target substance) than ammonium paratungstate, sodium tungstate and sodium metatungstate (the source substances), the resulting toxicity potential is expected to be similar or lower, so read-across is appropriate. In addition, read-across is justified because the classification and labelling is the same or less severe for the target substance and the PBT/vPvB profile is the same. Finally, the dose descriptors are, or are expected to be, sufficiently similar or higher for the target substance, and read-across to the source chemicals are adequately protective. 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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