Ammonium metatungstate has the appearance of white crystal or yellowish powder, the purity is up to 99.95%, the melting point is above 300℃, the relative density is 2.3g/cm³, it can be dissolved in water, insoluble in ethanol, it exists stably at normal temperature and pressure, but it is easy to decompose into WO3 when heated, it is worth to say that, in the same condition, the solubility of AMT in water is greater than APT, that is the most obvious difference between them; AMT has some irritation and toxicity, so it should be careful to prevent its contact with eyes and skin when producing and using it. This is the most obvious difference between the two; AMT has a certain degree of irritation and toxicity, so in the production and use of special attention to prevent its contact with eyes and skin.
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