Table of chemical composition requirements for tungstic acid standards (%).
Grade | T.A-special | T.A-1 | T.A-2 | |
WO3≥ | 91.0 | 90.0 | 85.0 | |
Impurity(≤) | Al | 0.0005 | 0.001 | 0.001 |
As | 0.010 | 0.012 | 0.015 | |
Bi | 0.0005 | 0.0005 | 0.0005 | |
Ca | 0.005 | 0.008 | 0.010 | |
Co | 0.001 | 0.001 | 0.001 | |
Cr | 0.001 | 0.001 | 0.001 | |
Cu | 0.0005 | 0.0005 | 0.0005 | |
Fe | 0.003 | 0.004 | 0.004 | |
K | 0.0005 | 0.0005 | 0.0005 | |
Mg | 0.0005 | 0.0005 | 0.0005 | |
Mn | 0.0005 | 0.0005 | 0.0005 | |
Mo | 0.015 | 0.020 | 0.025 | |
Na | 0.004 | 0.004 | 0.004 | |
Ni | 0.0005 | 0.0005 | 0.0005 | |
P | 0.005 | 0.005 | 0.005 | |
Pb | 0.0005 | 0.0005 | 0.0005 | |
S | 0.005 | 0.005 | 0.005 | |
Sb | 0.0005 | 0.0005 | 0.0005 | |
Si | 0.004 | 0.005 | 0.010 | |
Sn | 0.0005 | 0.0005 | 0.0005 | |
Ti | 0.001 | 0.001 | 0.001 | |
V | 0.001 | 0.001 | 0.001 | |
Other Requirement | Tungstic acid powder should pass through a 420μm sieve; bulk density is 0.65g/cm3~1.0g/cm3; appearance
The tungstic acid powder is light yellow, and the color should be uniform without visible inclusions. |
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Note | Reference standards for inspection methods: Elemental chemical composition analysis is carried out in accordance with GB/T4324, particle size detection is in accordance with GB/T1480, bulk density measurement method is in accordance with GB/T1479, and product appearance quality is inspected visually. |
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