Appearance White crystal
Assay 99.5%min
Ammonium salt 0.3% max
Water insoluble 0.1% max
Water 0.3% max
Ash content 0.05% max
Water-soluble test Qualified
Melting Point 184~188 ℃
Absorbance(260nm)
Absorbance(280nm) 0.04 max
0.02 max
pH(4% aqueous solution) 6.4±0.2
