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| Items | Specification |
| Appearance | White or almost white crystalline powder |
| Identification | Meet the requirement |
| Appearance of Solution | Meet the requirement |
| Loss on Drying | ≤ 0.5% |
| Sulphates | ≤ 0.2% |
| Impurities A | ≤ 0.5% |
| Impurities B | ≤ 1.0% |
| Unspecified Impurities | ≤ 0.2% |
| Total Impurities | ≤ 2.0% |
| Assay | 98.0~102.0% |
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