Ammonium metatungstate [(NH4)6(H2W12O40)]•nH2O, referred to as AMT. It is characterized by high solubility in water, which can reach 300g/100gH2O at 20°C, so it may be used to prepare high-concentration tungstate solutions without alkali metal ions. Industrially, metatungstic acid is mainly used to treat substrates (such as alumina pellets) for the production of catalysts. In addition, as a corrosion inhibitor, it is used in nuclear shielding. Money metatungstate can also be used to prepare precursors of other tungsten compounds.
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