Characteristics: White crystalline or crystalline powder
Identification: Corresponds
Melting range:137℃~142℃
Clarity: Clear
Heavy metals: less than 10PPM
Acidity: 3.5~4.5
Loss on drying: not less than 1.0%
Residue on ignition: not less than 0.1%
Related substance: not less than 0.5%
Assay: not less than 98.5％