The testing standards of Ammonium Metatungstate mainly include the following aspects:
National standards for ammonium metatungstate testing
GB/T 26033-2010: This is the national standard about Ammonium Metatungstate, which stipulates the requirements, test methods, inspection rules, marking, packaging, transportation, storage and quality certificate of Ammonium Metatungstate.
Chemical analysis method:
GB/T 23368.1-2009: Part 1 of the chemical analysis method for ammonium metatungstate, which specifies the determination of the amount of water-insoluble substance.
GB/T 23368.2-2009: Part 2 of the chemical analysis method for ammonium metatungstate, stipulates the determination method of zinc amount, specifically using flame atomic absorption spectrometry.
Ammonium metatungstate testing items
Content determination
Determine the content of tungsten in ammonium metatungstate by chemical method to evaluate its purity.
Impurity Determination
Detect the content of impurities that may exist in Ammonium Metatungstate, such as phosphorus, silicon, aluminum, iron, calcium, magnesium and other elements.
pH Detection
Determine the acidity and alkalinity of the solution to ensure the stability of Ammonium Metatungstate under specific conditions.
Appearance quality
Check the appearance characteristics of Ammonium Metatungstate such as color, form, crystallinity, etc.
Determination of moisture content
Determine the moisture content in Ammonium Metatungstate by Karl Fischer method and other methods.
Particle size analysis
Determine the particle size distribution of Ammonium Metatungstate using particle size analyzer.
Thermal Stability Analysis
Determine the stability of Ammonium Metatungstate at high temperature by Thermogravimetric Analysis (TGA) or Differential Scanning Calorimetry (DSC) and other methods.
Packing and transportation of Ammonium Metatungstate
Packaging and transportation of Ammonium Metatungstate also need to comply with appropriate standards to ensure that it is not damaged or contaminated during transportation and storage.
However, these standards and methods may be adjusted according to specific application areas and customer requirements. Therefore, when conducting ammonium metatungstate testing, appropriate testing methods and standards should be selected according to the actual situation. Meanwhile, in order to ensure the accuracy and reliability of the test results, a testing organization with appropriate qualification and experience should be selected for the test.
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