Appearance
White crystalline powder
Specific rotation(a)D20
(C=1 , H2O )
+7.7o to +8.5o
Solubility (1.0g/20ml H2O)
Clear Colorless
Melting Point (oC)
211-216 oC
Chloride(C1)
Not more than 0.02%
Iron(Fe)
Not more than 10ppm
Heavy metals( Pb )
Not more than 10ppm
Arsenic(As2O3 )
Not more than 4ppm
Loss on drying( 100 ¡æ 3h)
Not more than 0.50%
Residue on ignition
Not more than 0.2%
Assay
98.0-102.0%
PH
5.0~6.0