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| Items | Specification |
| Appearance | Almost white crystalline powder |
| Identification | Meets the requirements |
| Solubility | H2O: 0.03mg/ml (P H: 5-12, 25) |
| Melting Point | 296.0 ~ 303.0 |
| Water | ≤ 0.5% |
| Residue on Ignition | ≤ 0.1% |
| Selenium | ≤ 0.003% |
| Heavy Metals | ≤ 0.001% |
| Impurity | ≤ 0.5% |
| Total Impurities | ≤ 1.0% |
| Assay | 98.0 ~ 101.0% |
| Standard | USP28 |
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