| ≥1 piece |
| CaCO 3 | % | 98.0-100.5 | 98.0-100.5 |
| Loss on drying | ≤ % | 2.0 | 2.0 |
| Acid-insoluble substance | ≤ % | 0.1 | 0.1 |
| iron | ≤ % | 0.02 | 0.02 |
| Heavy metals | ≤ % | 0.002 | 0.002 |
| Lead | ≤ ppm | 3 | 3 |
| Arsenic | ≤ ppm | 3 | 3 |
| Fluoride | ≤ % | 0.005 | 0.005 |
| mercury | ≤ ppm | 0.5 | 0.5 |
| Magnesium and alkali salts | ≤ % | 1.0 | 1.0 |
| Barium | ≤ % | 0.030 | 0.030 |
| Free alkali | Meets the requirements | Meets the requirements | |
| Chloride | ≤ ppm | 330 | 330 |
| Sulfate | Meets the requirements | Meets the requirements |