Appearance White needle crystal or powder White powder
Melting Point 199-201 199.5-201.5
Clarity of water solution Transparency colorless, none
suspended matters Complies
PH Value of 1% Aqueous Solution 5.0-7.0 6.30
Specific Optical Rotation [a]20 -65.00 -65.1
Heavy Metals 10PPM max 5PPM
Infrared peak value requires Complies
Arsenic 2PPM max 0PPM
Hydroquinone negative Negative.0ppm
Loss on Drying 0.5% max 0.16%
Residue on Ignition 0.5% max 0.35%
Bacteria count Bacteria 300cpu max 101
Fungus 100cpu max 29
Assay(HPLC) 99.5% min 99.95%