| Test Item | Standard Specifications |
| Description | Blue crystal powder |
| Content(no HO) | 98.0~102.0% |
| Identification | Meets the requirements |
| Sulfate | ≤0.05% |
| Chloride | ≤0.05% |
| Reducing substances | ≤1.0% |
| Lead | ≤3mg/kg |
| Hg | ≤1mg/kg |
| Total plate count | ≤1000cfu/g |
| Yeast & Mold | ≤100cfu/g |
| Enterobacterial | Absent |
| E.Coli | Absent |
| Salmonella species | Absent |
| Staphylococcus aureus | Absent |
