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Appearance     White crystals or crystalline powder
Assay (as NH4HCO3, %)     99.0-100.5
Chlorides (as Cl, %)     =< 0.003
Sulfur compound (as SO4, %)     =< 0.007
Residue after evaporation (%)     =< 0.008
Specific optical rotation     +20.5° ~ +21.5°
Lead     =< 3 mg/kg
Arsenic     =< 2 mg/kg
Total Heavy metal (as Pb)     =< 10 mg/kg