The tungsten content of Ammonium Metatungstate (AMT), especially the content of tungsten (W), its main component, can vary according to different production batches, specifications and purity grades. However, generally speaking, the tungsten content of Ammonium Metatungstate is one of its main indicators of concern.
- Content of tungsten (W)
In many literatures and materials, the content of tungsten in ammonium metatungstate is usually expressed in its oxide form (WO₃). For example, some materials point out that the content of WO₃ in ammonium metatungstate can reach 83% or higher.
On the other hand, from the perspective of elemental tungsten (W), the content of tungsten (in terms of W) is also relatively high because the tungsten valence in ammonium metatungstate is usually +6 and the molecular formula of ammonium metatungstate contains multiple tungsten atoms (e.g., H₂₈N₆O₄₁W₁₂). Specifically, according to the calculation of the molecular formula, the content of tungsten (in terms of mass percentage of W) can be about 72% (this value is an approximation based on the proportion of W atoms in the molecular formula H₂₈N₆O₄₁W₁₂ and the calculation of the relative atomic mass, and the actual content may vary according to the (The actual content may vary depending on product specifications and purity).
- Content of other substances
Besides tungsten (W), ammonium metatungstate may also contain other chemical elements as impurities. The content of these impurities is usually very low, and there are different limits in different product specifications and purity grades. For example, some information mentions that ammonium metatungstate may contain impurity elements such as aluminum (Al), arsenic (As), bismuth (Bi), calcium (Ca), chromium (Cr), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), molybdenum (Mo), sodium (Na), nickel (Ni), phosphorus (P), lead (Pb), sulfur (S), antimony (Sb), silicon (Si), tin (Sn), and silicon (Si). The maximum content limit of tin, titanium, vanadium, and so on.
Precautions
It should be noted that the contents of tungsten and other substances mentioned above are based on the general situation and the overview of some specific information, and do not represent the actual contents of all Ammonium Metatungstate products. In practical application, the exact content of ammonium metatungstate should be determined according to specific product specification sheets, product instructions or relevant standards.
In addition, due to the differences in production process, raw material sources and product quality control, the substance content of ammonium metatungstate products produced by different manufacturers may also be different. Therefore, when selecting and using ammonium metatungstate, product labels, instructions and relevant quality documents should be carefully checked to ensure that the products meet the requirements for use.
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