Characteristics： 
White or yellowish crystalline powder
Identification：Positive Reaction
Specific Optical Rotation：+103°–+106°
PH：6.5-8.0
Oxalic Acid：0.3% max
Loss of Drying：0.25% max
Heavy Metals：10ppm max
Lead：2ppm max
Mercury：1ppm max
Arsenic：3ppm max
Assay：99.0~101.0%
Organic Volatile Impurities：Pass