Items | Tech Grade | Food Grade |
Assay | ≥98.0% | 99.0 % ~102.0 % |
Loss on drying | ≤0.5% | ≤0.3% |
Reducing Substances | ≤0.7% | ≤0.5% |
Heavy Metals | ≤0.001% | ≤0.0005% |
As | ≤2ppm | ≤1ppm |
Sulphate | ≤0.05% | ≤0.05 % |
Chloride | ≤0.07% | ≤0.05 % |
Lead | ≤0.0002% | ≤0.0001% |
PH(10% solution) | 6.2-7.8 | 6.2-7.8 |