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Item | Food grade | Idustry grade | Test Result | |
Appearance | White or yellowish crystal powder | Meet the standard | ||
Solubility | Easily soluble in water, slightly in alcohol and insoluble in ether | Meet the standard | ||
Identification | Meet the standard | Meet the standard | Meet the standard | |
Assay,% ≥ | 99-102 | 98 | 99.2 | |
Moisture,% ≤ | 0.50 | 1.0 | 0.35 | |
Reduzate,% ≤ | 0.50 | 0.7 | 0.50 | |
Sulfate,% ≤ | 0.05 | 0.05 | 0.04 | |
Chloride,% ≤ | 0.07 | 0.1 | 0.05 | |
Pb,ug/g ≤ | 1 | 2 | 2 | |
As,ug/g ≤ | 2 | 2 | 2 | |
Heavy metals,ug/g ≤ | 10 | 10 | 6 | |
PH | 6.2-7.8 | 6.2-7.8 | 7.0 | |






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