[Characters]White to slightly yellow crystalline powder, odorless. Soluble in water, slightly soluble in ethanol or acetic acid.
[Acidity] pH：4.5-6.5
[Loss of drying] Less than 3.0%
[Clarity and Color] Dissolve 0.5 g of the sample by 30 ml water , the solution should be clear.
[Ignition Residue] Less than 0.1%.
[Assay]more than 98.0%（the dried）
[Package]25kg/drum.