The stability of Ammonium Metatungstate Hydrate is affected by many factors:
Influence of pH value
In the range of pH 1.0~2.4, as the pH of the feed solution increases, the more stable the feed solution is (refer to Article 2). In particular, when the pH value is selected as 1.6, it is more suitable for the preparation of the complexing feed solution (refer to Article 2).
When the pH of the material is very low, precipitation occurs after a very short period of time, indicating that the material is less stable at low pH (Ref. 2).
Influence of storage time
The experiments showed that the extraction rates of tungsten and molybdenum stabilized when the placement time of the feed solution reached 24h, indicating that the reaction between H2O2 and ammonium metatungstate solution needed enough time to be complete (Ref. Article 2).
However, leaving it for too long will also affect the stability of the feed solution, so the feed solution should not be left for too long (refer to Article 2).
Effect of Initial Concentration
The initial concentration of ammonium metatungstate affects its pH, usually the higher the concentration, the lower the pH (refer to Article 4). This may indirectly affect the stability of ammonium metatungstate hydrate, as pH is an important factor in stability.
Effect of solution temperature
Although temperature has a significant effect on the solubility of ammonium metatungstate, specific data or descriptions of the direct effect of temperature on its stability are not explicitly mentioned in the referenced article. In general, however, high temperatures may accelerate chemical reactions and decomposition processes and therefore may have a negative effect on stability.
Effects of Ionic Strength and Other Chemicals
The ionic strength and other chemicals in solution may also affect the stability of ammonium metatungstate hydrate. Higher ionic strength and lower pH may reduce its stability (refer to Article 4). In addition, other chemicals present in the solution (e.g., alkaline or acidic substances) may also affect its stability by changing the pH.
In summary, the stability of ammonium metatungstate hydrate is affected by a variety of factors such as pH, the time the material is placed in the solution, the initial concentration, the temperature of the solution, the ionic strength and other chemicals. In practical application, these factors need to be considered comprehensively to ensure the stability of ammonium metatungstate hydrate by controlling these conditions.
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