| Test Item | Specification | Test method or Reference |
| Appearance | White crystalline powder | GB、FCC、USP-NF、JECFA、EP、 EU231/2012 |
| Assay (on anhydrous basis) | 98.0 ~102.0% | GB、FCC、USP-NF、EP、EU231/2012 |
| Water | ≤2.0% | GB、FCC、USP-NF、JECFA、EP、 EU231/2012 |
| Methanol | ≤0.1% | GB、FCC、USP-NF、JECFA、 EU231/2012 |
| Heavy Metals (as Pb) | ≤10 mg/kg | GB |
| Arsenic | ≤3 mg/kg | GB |
| Lead | ≤1 mg/kg | GB |
| Particle Size | Through 60 mesh ≥90% | Internal method |
| Total Aerobic Plate Count | ≤250 CFU/g | GB |
| Coliforms | ﹤3 MPN/g | GB |
| Yeast Count | ≤50 CFU/g | GB |
| Mold Count | ≤50 CFU/g | GB |
| Escherichia Coli | Negative/25g | GB |
| Staphylococcus aureus | Negative/25g | GB |
| Shigella | Negative/25g | GB |
| Salmonella | Negative/25g | GB |
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