Quality Standards of Ammonium Metatungstate
Ammonium Metatungstate Quality Standards by Grade
• Industrial-grade AMT:
o WO₃ content ≥ 89%
o Impurities (e.g., Mo, Fe) ≤ 0.05%
o Moisture content ≤ 8%
• Catalyst-grade AMT:
o WO₃ content ≥ 91%
o Impurities ≤ 0.01%
o Stricter limits on alkali metal content (Na, K < 50 ppm)
In China, the quality standard for AMT follows the GB/T 26033-2010 regulation.
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