The testing methods of Ammonium Metatungstate mainly include the following, which will be summarized according to different testing items:
Determination of the amount of water insoluble matter
Method: Weighing method
Based on standard: GB/T 23368.1-2009 Ammonium metatungstate chemical analysis method Part 1
Scope of application: It is applicable to the determination of the amount of water-insoluble matter in ammonium metatungstate, and the range of determination is 0.0025%~2%.
Method summary: Dissolve the test material with water, filter and separate the insoluble matter, and the mass value after drying is the amount of water-insoluble matter.
Determination of zinc amount
Method: Flame atomic absorption spectrometry
Standard: GB/T 23368.2-2009 Method of chemical analysis for ammonium metatungstate Part 2
Scope of application: For the determination of zinc in ammonium metatungstate.
Determination of tungsten dioxide content
Method: Chemical analysis or other appropriate methods
Note: Although no specific test method or standard is directly given, tungsten dioxide content in ammonium metatungstate can usually be determined by chemical analysis or other means.
Determination of impurity content
Methods: may include advanced instrumental analytical methods such as ICP-OES (Inductively Coupled Plasma Emission Spectrometer)
Scope of application: Used to determine the content of impurity elements in ammonium metatungstate, such as Co, Cr, etc.
Note: Different impurity elements may require different detection methods.
PH Value Detection
Method: Determination using a PH meter
Scope of application: Used to determine the acidity and alkalinity of ammonium metatungstate solution.
Appearance quality
Method: Visual inspection
Scope of application: direct observation of the appearance of ammonium metatungstate, such as color, crystalline state, etc.
Other possible testing items:
Physical properties such as purity, density, melting point of ammonium metatungstate can also be determined by corresponding test methods.
In a word, the detection methods of ammonium metatungstate cover a variety of means from simple observation of physical properties to complex chemical analysis and instrumental analysis. The specific testing methods should be determined according to the needs of the items to be tested and the conditions of the laboratory. Meanwhile, in order to ensure the accuracy and reliability of the test results, the test methods conforming to the national or industrial standards should be selected and quality control and verification should be carried out when necessary.
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