Appearance: White crystalline powder Specific rotation: +84.0 - +87.5o PH value(10% solution): 5 - 8 Assay(on dried basis): 98.0% min Moisture: 2.0% max Methanol: 0.1% max Heavy metals(as Pb): 10 ppm max Arsenic: 3 ppm max Residue on ignition: 0.7% max.