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Item | Standard |
Appearance | White crystalline powder |
Clarity of solution | Positive |
Assay(%) | clear |
Loss on drying (%) | 99.0-100.5 |
Residue on ignition(%) | ≤0.40 |
Sulphate ash | ≤0.10 |
Specific rotation | ≤0.10 |
PH value(2% solution) | from +20.5+21.5 |
PH value(5% solution) | 2.4-2.8 |
Heavy metals | 2.1-2.6 |
Iron | ≤3ppm |
Copper | ≤2 ppm |
Total plate count | ≤1000cfu/g |
Arsenic | ≤1 ppm |
Mercury | ≤1 ppm |
Organic volatile impurities | Meets the requirements |
Chloride(Cl%) | ≤0.30 |
Melting poit(℃) | about 190 |
Cadmium | ≤1 ppm |
Lead | ≤2 ppm |
Storage | in the shade |
Packing | 25kg/bag |






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