Appearance: White or off- white crystalline powder

Assay( dry basis)：99.0%min

Absorption coefficient: E (1% 1cm) 751-797

Identification: IR

Positive reaction: Complies

Chloride: Complies

Related substances

   Single impurity: 0.20%max

   Total impurity: 1.00%max

Loss on drying：0.50%max

Residue on ignition：0.10%max

Heavy metal：10ppm max