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| Item | Specifications |
| Appearance | White powder |
| Assay | ≥99% |
| Acidic Radical | ≥76% |
| Loss on drying | ≤0.5% |
| PH | 5~7 |
| Heavy metals | ≤10ppm |
| As | ≤1ppm |
| Chlorides | ≤20ppm |
| Sulfates | ≤20ppm |