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| Item | Specifications |
| Content | 99.0% min |
| PH | 7.0~8.0 |
| Loss on drying | ≤0.5% |
| Residue on ignition | ≤0.1% |
| Heavy metals | ≤10ppm |
| Sulphate | ≤0.07% |
| Chloride | ≤140ppm |
| Arsenic | ≤2ppm |