Item | Food grade | Industry grade | Test Result | Appearance | White crystal powder or granule | Pass | Solubility | Easily soluble in water, slightly soluble in alcohol and insoluble in ether | Pass | Identitification | Pass | Pass | Pass | Assay,% | 99.0 min | 98.0 min | 99.28 | Dry weight loss,% | 0.50max | 1.0max | 0.20 | Reducing substances,% | 0.50 max | 1.0 max | 0.20 | Sulfate,% | 0.05 max | 0.2 max | 0.004 | Chloride,% | 0.07 max | 0.1 max | 0.003 | Lead (pb),% | 0.001max | 0.002 max | 0.0005max | Arsenic (AS),% | 0.0003max | 0.0002 max | 0.0001max | Heavy metals(pb),% | 0.002 max | 0.002 max | 0.0005max | PH | 6.2-7.8 | 6.2-7.8 | 7.2 |
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