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