Complaint
| Items | Standard |
| Characteristics | A white crystalline powder or colourless crystals or white pearls,freely soluble in water.Practically insoluble in alcohol. |
| Identification | Positive |
| Loss on drying | ≤ 0.5% |
| Acidity/alkalinity | Conform |
| Appearance of solution | Conform |
| Arse | ≤ 0.0001% |
| Barium | Conform |
| Iron | ≤ 0.002% |
| Magnesium and alkaline-earth metals | ≤ 0.01% |
| Bromides | ≤ 0.005% |
| Iodides | Conform |
| Sulphate | ≤ 0.02% |
| Heavy metals | ≤ 0.0005% |
| Aluminium | ≤ 0.00002% |
| Ferrocyanides | Conform |
| Phosphates | ≤ 0.0025% |
| Nitrites | The absorbance is not more than 0.01 |
| Bacterial endotoxins | ≤ 5IU/g |
| Microbial limit | ≤ 100cfu/g |
| Assay | 99.0%~100.5% |
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