Determination Method of Tungsten Content in Ammonium Metatungstate

Ammonium Metatungstate Picture
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Tungsten is the core element of ammonium metatungstate, and its content is typically reported in the form of tungsten trioxide (WO₃). The WO₃ content in industrial-grade AMT is generally required to be between 89% and 92%. Common determination method of tungsten content includes:

Inductively Coupled Plasma Mass Spectrometry (ICP-MS): AMT is dissolved in water, diluted, and introduced into an ICP-MS instrument to detect the characteristic spectrum of tungsten ions. This method offers extremely high sensitivity, capable of detecting tungsten content down to parts per million (ppm) levels, making it widely used for high-purity AMT analysis.

Gravimetric Analysis: AMT is heated to 600–800°C, decomposing into WO₃. The residual mass is then measured to calculate the WO₃ content. Although this traditional method is time-consuming, it provides reliable results and is well-suited for laboratory validation.

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Purple Tungsten Oxide

Purple tungsten oxide phase composition of WO2.72 (or W18O49), which is one of tungsten oxide, abbreviated VTO, is a purple crushed crystalline powder, the color generally purple or blue purple.
sodium tungstate photo

Sodium Tungstate

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ammonium paratungstate photo

Ammonium Paratungstate

Ammonium paratungstate is a chemical substance, mainly white crystals, there are two kinds of tablets or acupuncture for the manufacture of tungsten trioxide or blue tungsten oxide metal tungsten powder.
tungstic acid

Tungstic Acid

Tungstic acid refers to hydrated forms of tungsten trioxide, WO3. The simplest form, the monohydrate, is WO3.H2O, the dihydrate WO3.2H2O is also known. The solid state structure of WO3. H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.
yellow tungsten oxide photo

Yellow Tungsten Oxide

0.6um yellow tungsten oxide, an oxide of tungsten, the appearance of a positive yellow powder, stable at room temperature, the apparent density of 0.6-1.0g / cm3.
blue tungsten oxide photo

Blue Tungsten Oxide

Blue Tungsten Oxide refers to a class of dark blue compounds containing a mixed valence state of tungsten (VI) and tungsten (V). The appearance is dark blue powder.