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Testing Item | Standard | Result |
Appearance | White crystals or crystalline powder | White crystalline powder |
Assay (on anhydrous basis) | 98.0% ~ 102.0% | 99.6% |
Appearance of solution | Clear, not more intense than Y7 | Conform |
PH | 2.7 ~ 3.3 | 3.2 |
Water | ≤ 5.0% | 3.39% |
Sulphates | ≤ 0.03% | <0.03% |
Residue on ignition | ≤ 0.1% | 0.01% |
Absorbance of solution | ≤ 0.025 | 0.011 |
Limit of nitrate | No brown ring is produced at the junction of the two layers | Conform |
Related compounds | ≤ 1.0% | 0.03% |


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