| ITEMS | STANDARDS |
| Characters | White or almost white,crystalline powder,or crystals |
| Identification | Meet the requirements |
| Solubility | Freely soluble in water, practically insoluble in acetone and in ethanol(96 percent) |
| Appearance of solution | Solution S is not more opalescent than reference suspension II and not more intensely coloured than reference solution Y6 |
| Alkalinity | Meet the requirements |
|
Glyceol and ethanol -soluble substances |
NMT 1.0% |
| Chlorides | NMT 0.02% |
| Sulphates | NMT 0.05% |
| Water | 25.0-35.0% |
| Iron | NMT 0.002% |
| Heavy Metal | NMT 20ppm |
| Assay |
98.0~105.0% (Anhydrous substance) |
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