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Reagent grade ammonium fluoride
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Executive standard: GB/T1276-1999 |
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Item |
Index |
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|
Guaranteed reagent |
Analytical grade |
Chemical pure |
|
|
Content (NH4F) ％≥ |
96.0 |
96.0 |
95.0 |
|
Clarity test |
Qualified |
Qualified |
Qualified |
|
Ignition residue (Sulfate) ％≤ |
0.005 |
0.02 |
0.05 |
|
Free acid (NH4HF2) ％≤ |
0.2 |
0.5 |
1.0 |
|
Free alkali |
Qualified |
Qualified |
Qualified |
|
Fluoride (Cl) ％≤ |
0.0005 |
0.005 |
0.01 |
|
Sulfate (SO4), ％≤ |
0.005 |
0.01 |
0.02 |
|
Fluosilicate， ％ ≤ |
0.08 |
0.30 |
0.60 |
|
Iron (Fe), ％ ≤ |
0.0005 |
0.002 |
0.004 |
|
Heavy metal (Pb), ％ ≤ |
0.0005 |
0.001 |
0.002 |