Appearance:

Off-white crystalline powder

Melting point:

118-122 degree

Loss on drying:

Not more than 0.3%

Residue on Ignition:

Not more than 0.1%

Related substance:

Not more than 0.5%

Organic volatile impurity:

Not more than 0.5%

Chloride:

Not more than 0.5%

Heavy metals (Pb):

Not more than 20ppm

Arsenic:

Not more than 2ppm

pH value:

5.5-7.0

Assay (by HPLC):

Not less than 99%