The chemical analysis methods of Ammonium Metatungstate are mainly as follows, which are indicated and summarized in points below:
Determination of the amount of water insoluble matter (weighing method)
Reference standard: GB/T 23368.1-2009
Determination range: 0.0025%～2%
Principle: The test material is dissolved in water, filtered to separate its insoluble matter, and the mass value after drying is the amount of water insoluble matter.
Reagents and materials: distilled water (or deionized water), controlled at 25℃±5℃; glass sand core crucible (G4).
Analyzing steps:
Dissolve ammonium metatungstate in 70ml-80ml distilled water, after clearing the dissolution, transfer it into 100ml volumetric flask, dilute it to the scale with distilled water and shake well.
The solution was filtered and washed until it did not contain tungsten.
Put the sand core crucible into 105 ℃ -110 ℃ constant temperature drying oven insulation 1h, remove and put in a desiccator cooled to room temperature, weighing.
Determination of zinc amount (flame atomic absorption spectrometry)
Reference standard: GB/T 23368.2-2009
Determination range: 0.0003%～0.020%
Principle: Measurement of the zinc content in the sample using flame atomic absorption spectrometry.
In addition to the above two methods, other chemical analysis methods may be involved to detect other elements or impurities in ammonium metatungstate, such as ICP-OES method (Inductively Coupled Plasma Emission Spectrometry) for the determination of the content of Co and other impurity elements, and AA-1800 Atomic Absorption method for the direct determination of potassium, an impurity element in Ammonium Paratungstate (APT), and so on.
These chemical analysis methods provide important means for the quality control of Ammonium Paratungstate, ensuring that the purity and quality of Ammonium Paratungstate meet the relevant standards and requirements.
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