| TEST ITEM | PECIFICATION |
| ASSAY | 99.0%~100.5% |
| Identification | Positive reaction |
| Carbonates and SUBSTANCES insoluble in acids | 0.006%MAX |
| PbO(tested in Pb) | 0.005%MAX |
| Heavy metal(tested in Zn) | none |
| MnO(tested in Mn) | 0.0001% MAX |
| CuO(tested in Cu) | 0.0002%MAX |
| As | 0.0005%MAX |
| Cd | 0.001% MAX |
| Loss on ignition | 0.2%MAX |
| Water dissoluble | 0.1%MAX |
| 105℃ volatile substances | 0.3%MAX |
| Alkalinity | Add 0.1ml of phenolphthalein solution to the mixture SOLUTION, filtered,,add hydrochloric acid to change the red colour to the indicator. |
| APPEARANCE | SOFT WHITE OR FAINTLY YELLOWISH-WHITE AMORPHOUS POWDEr |
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